diff options
Diffstat (limited to 'src/sat')
50 files changed, 19472 insertions, 0 deletions
diff --git a/src/sat/bsat/module.make b/src/sat/bsat/module.make new file mode 100644 index 00000000..563c8dfc --- /dev/null +++ b/src/sat/bsat/module.make @@ -0,0 +1,6 @@ +SRC += src/sat/bsat/satMem.c \ + src/sat/bsat/satInter.c \ + src/sat/bsat/satSolver.c \ + src/sat/bsat/satStore.c \ + src/sat/bsat/satTrace.c \ + src/sat/bsat/satUtil.c diff --git a/src/sat/bsat/satInter.c b/src/sat/bsat/satInter.c new file mode 100644 index 00000000..8759aa09 --- /dev/null +++ b/src/sat/bsat/satInter.c @@ -0,0 +1,991 @@ +/**CFile**************************************************************** + + FileName [satInter.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [SAT sat_solver.] + + Synopsis [Interpolation package.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: satInter.c,v 1.4 2005/09/16 22:55:03 casem Exp $] + +***********************************************************************/ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> +#include <time.h> +#include "satStore.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +// variable assignments +static const lit LIT_UNDEF = 0xffffffff; + +// interpolation manager +struct Int_Man_t_ +{ + // clauses of the problems + Sto_Man_t * pCnf; // the set of CNF clauses for A and B + // various parameters + int fVerbose; // verbosiness flag + int fProofVerif; // verifies the proof + int fProofWrite; // writes the proof file + int nVarsAlloc; // the allocated size of var arrays + int nClosAlloc; // the allocated size of clause arrays + // internal BCP + int nRootSize; // the number of root level assignments + int nTrailSize; // the number of assignments made + lit * pTrail; // chronological order of assignments (size nVars) + lit * pAssigns; // assignments by variable (size nVars) + char * pSeens; // temporary mark (size nVars) + Sto_Cls_t ** pReasons; // reasons for each assignment (size nVars) + Sto_Cls_t ** pWatches; // watched clauses for each literal (size 2*nVars) + // interpolation data + int nVarsAB; // the number of global variables + char * pVarTypes; // variable type (size nVars) [1=A, 0=B, <0=AB] + unsigned * pInters; // storage for interpolants as truth tables (size nClauses) + int nIntersAlloc; // the allocated size of truth table array + int nWords; // the number of words in the truth table + // proof recording + int Counter; // counter of resolved clauses + int * pProofNums; // the proof numbers for each clause (size nClauses) + FILE * pFile; // the file for proof recording + // internal verification + lit * pResLits; // the literals of the resolvent + int nResLits; // the number of literals of the resolvent + int nResLitsAlloc;// the number of literals of the resolvent + // runtime stats + int timeBcp; // the runtime for BCP + int timeTrace; // the runtime of trace construction + int timeTotal; // the total runtime of interpolation +}; + +// procedure to get hold of the clauses' truth table +static inline unsigned * Int_ManTruthRead( Int_Man_t * p, Sto_Cls_t * pCls ) { return p->pInters + pCls->Id * p->nWords; } +static inline void Int_ManTruthClear( unsigned * p, int nWords ) { int i; for ( i = nWords - 1; i >= 0; i-- ) p[i] = 0; } +static inline void Int_ManTruthFill( unsigned * p, int nWords ) { int i; for ( i = nWords - 1; i >= 0; i-- ) p[i] = ~0; } +static inline void Int_ManTruthCopy( unsigned * p, unsigned * q, int nWords ) { int i; for ( i = nWords - 1; i >= 0; i-- ) p[i] = q[i]; } +static inline void Int_ManTruthAnd( unsigned * p, unsigned * q, int nWords ) { int i; for ( i = nWords - 1; i >= 0; i-- ) p[i] &= q[i]; } +static inline void Int_ManTruthOr( unsigned * p, unsigned * q, int nWords ) { int i; for ( i = nWords - 1; i >= 0; i-- ) p[i] |= q[i]; } +static inline void Int_ManTruthOrNot( unsigned * p, unsigned * q, int nWords ) { int i; for ( i = nWords - 1; i >= 0; i-- ) p[i] |= ~q[i]; } + +// reading/writing the proof for a clause +static inline int Int_ManProofGet( Int_Man_t * p, Sto_Cls_t * pCls ) { return p->pProofNums[pCls->Id]; } +static inline void Int_ManProofSet( Int_Man_t * p, Sto_Cls_t * pCls, int n ) { p->pProofNums[pCls->Id] = n; } + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocate proof manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Int_Man_t * Int_ManAlloc( int nVarsAlloc ) +{ + Int_Man_t * p; + // allocate the manager + p = (Int_Man_t *)malloc( sizeof(Int_Man_t) ); + memset( p, 0, sizeof(Int_Man_t) ); + // verification + p->nResLitsAlloc = (1<<16); + p->pResLits = malloc( sizeof(lit) * p->nResLitsAlloc ); + // parameters + p->fProofWrite = 0; + p->fProofVerif = 1; + return p; +} + +/**Function************************************************************* + + Synopsis [Count common variables in the clauses of A and B.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Int_ManGlobalVars( Int_Man_t * p ) +{ + Sto_Cls_t * pClause; + int Var, nVarsAB, v; + + // mark the variable encountered in the clauses of A + Sto_ManForEachClauseRoot( p->pCnf, pClause ) + { + if ( !pClause->fA ) + break; + for ( v = 0; v < (int)pClause->nLits; v++ ) + p->pVarTypes[lit_var(pClause->pLits[v])] = 1; + } + + // check variables that appear in clauses of B + nVarsAB = 0; + Sto_ManForEachClauseRoot( p->pCnf, pClause ) + { + if ( pClause->fA ) + continue; + for ( v = 0; v < (int)pClause->nLits; v++ ) + { + Var = lit_var(pClause->pLits[v]); + if ( p->pVarTypes[Var] == 1 ) // var of A + { + // change it into a global variable + nVarsAB++; + p->pVarTypes[Var] = -1; + } + } + } + + // order global variables + nVarsAB = 0; + for ( v = 0; v < p->pCnf->nVars; v++ ) + if ( p->pVarTypes[v] == -1 ) + p->pVarTypes[v] -= nVarsAB++; +//printf( "There are %d global variables.\n", nVarsAB ); + return nVarsAB; +} + +/**Function************************************************************* + + Synopsis [Resize proof manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Int_ManResize( Int_Man_t * p ) +{ + // check if resizing is needed + if ( p->nVarsAlloc < p->pCnf->nVars ) + { + // find the new size + if ( p->nVarsAlloc == 0 ) + p->nVarsAlloc = 1; + while ( p->nVarsAlloc < p->pCnf->nVars ) + p->nVarsAlloc *= 2; + // resize the arrays + p->pTrail = (lit *) realloc( p->pTrail, sizeof(lit) * p->nVarsAlloc ); + p->pAssigns = (lit *) realloc( p->pAssigns, sizeof(lit) * p->nVarsAlloc ); + p->pSeens = (char *) realloc( p->pSeens, sizeof(char) * p->nVarsAlloc ); + p->pVarTypes = (char *) realloc( p->pVarTypes, sizeof(char) * p->nVarsAlloc ); + p->pReasons = (Sto_Cls_t **)realloc( p->pReasons, sizeof(Sto_Cls_t *) * p->nVarsAlloc ); + p->pWatches = (Sto_Cls_t **)realloc( p->pWatches, sizeof(Sto_Cls_t *) * p->nVarsAlloc*2 ); + } + + // clean the free space + memset( p->pAssigns , 0xff, sizeof(lit) * p->pCnf->nVars ); + memset( p->pSeens , 0, sizeof(char) * p->pCnf->nVars ); + memset( p->pVarTypes, 0, sizeof(char) * p->pCnf->nVars ); + memset( p->pReasons , 0, sizeof(Sto_Cls_t *) * p->pCnf->nVars ); + memset( p->pWatches , 0, sizeof(Sto_Cls_t *) * p->pCnf->nVars*2 ); + + // compute the number of common variables + p->nVarsAB = Int_ManGlobalVars( p ); + // compute the number of words in the truth table + p->nWords = (p->nVarsAB <= 5 ? 1 : (1 << (p->nVarsAB - 5))); + + // check if resizing of clauses is needed + if ( p->nClosAlloc < p->pCnf->nClauses ) + { + // find the new size + if ( p->nClosAlloc == 0 ) + p->nClosAlloc = 1; + while ( p->nClosAlloc < p->pCnf->nClauses ) + p->nClosAlloc *= 2; + // resize the arrays + p->pProofNums = (int *) realloc( p->pProofNums, sizeof(int) * p->nClosAlloc ); + } + memset( p->pProofNums, 0, sizeof(int) * p->pCnf->nClauses ); + + // check if resizing of truth tables is needed + if ( p->nIntersAlloc < p->nWords * p->pCnf->nClauses ) + { + p->nIntersAlloc = p->nWords * p->pCnf->nClauses; + p->pInters = (unsigned *) realloc( p->pInters, sizeof(unsigned) * p->nIntersAlloc ); + } +// memset( p->pInters, 0, sizeof(unsigned) * p->nWords * p->pCnf->nClauses ); +} + +/**Function************************************************************* + + Synopsis [Deallocate proof manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Int_ManFree( Int_Man_t * p ) +{ +/* + printf( "Runtime stats:\n" ); +PRT( "BCP ", p->timeBcp ); +PRT( "Trace ", p->timeTrace ); +PRT( "TOTAL ", p->timeTotal ); +*/ + free( p->pInters ); + free( p->pProofNums ); + free( p->pTrail ); + free( p->pAssigns ); + free( p->pSeens ); + free( p->pVarTypes ); + free( p->pReasons ); + free( p->pWatches ); + free( p->pResLits ); + free( p ); +} + + + + +/**Function************************************************************* + + Synopsis [Prints the clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Int_ManPrintClause( Int_Man_t * p, Sto_Cls_t * pClause ) +{ + int i; + printf( "Clause ID = %d. Proof = %d. {", pClause->Id, Int_ManProofGet(p, pClause) ); + for ( i = 0; i < (int)pClause->nLits; i++ ) + printf( " %d", pClause->pLits[i] ); + printf( " }\n" ); +} + +/**Function************************************************************* + + Synopsis [Prints the resolvent.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Int_ManPrintResolvent( lit * pResLits, int nResLits ) +{ + int i; + printf( "Resolvent: {" ); + for ( i = 0; i < nResLits; i++ ) + printf( " %d", pResLits[i] ); + printf( " }\n" ); +} + +/**Function************************************************************* + + Synopsis [Records the proof.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Extra_PrintBinary__( FILE * pFile, unsigned Sign[], int nBits ) +{ + int Remainder, nWords; + int w, i; + + Remainder = (nBits%(sizeof(unsigned)*8)); + nWords = (nBits/(sizeof(unsigned)*8)) + (Remainder>0); + + for ( w = nWords-1; w >= 0; w-- ) + for ( i = ((w == nWords-1 && Remainder)? Remainder-1: 31); i >= 0; i-- ) + fprintf( pFile, "%c", '0' + (int)((Sign[w] & (1<<i)) > 0) ); +} + +/**Function************************************************************* + + Synopsis [Prints the interpolant for one clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Int_ManPrintInterOne( Int_Man_t * p, Sto_Cls_t * pClause ) +{ + printf( "Clause %2d : ", pClause->Id ); + Extra_PrintBinary__( stdout, Int_ManTruthRead(p, pClause), (1 << p->nVarsAB) ); + printf( "\n" ); +} + + + +/**Function************************************************************* + + Synopsis [Adds one clause to the watcher list.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline void Int_ManWatchClause( Int_Man_t * p, Sto_Cls_t * pClause, lit Lit ) +{ + assert( lit_check(Lit, p->pCnf->nVars) ); + if ( pClause->pLits[0] == Lit ) + pClause->pNext0 = p->pWatches[lit_neg(Lit)]; + else + { + assert( pClause->pLits[1] == Lit ); + pClause->pNext1 = p->pWatches[lit_neg(Lit)]; + } + p->pWatches[lit_neg(Lit)] = pClause; +} + + +/**Function************************************************************* + + Synopsis [Records implication.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline int Int_ManEnqueue( Int_Man_t * p, lit Lit, Sto_Cls_t * pReason ) +{ + int Var = lit_var(Lit); + if ( p->pAssigns[Var] != LIT_UNDEF ) + return p->pAssigns[Var] == Lit; + p->pAssigns[Var] = Lit; + p->pReasons[Var] = pReason; + p->pTrail[p->nTrailSize++] = Lit; +//printf( "assigning var %d value %d\n", Var, !lit_sign(Lit) ); + return 1; +} + +/**Function************************************************************* + + Synopsis [Records implication.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline void Int_ManCancelUntil( Int_Man_t * p, int Level ) +{ + lit Lit; + int i, Var; + for ( i = p->nTrailSize - 1; i >= Level; i-- ) + { + Lit = p->pTrail[i]; + Var = lit_var( Lit ); + p->pReasons[Var] = NULL; + p->pAssigns[Var] = LIT_UNDEF; +//printf( "cancelling var %d\n", Var ); + } + p->nTrailSize = Level; +} + +/**Function************************************************************* + + Synopsis [Propagate one assignment.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline Sto_Cls_t * Int_ManPropagateOne( Int_Man_t * p, lit Lit ) +{ + Sto_Cls_t ** ppPrev, * pCur, * pTemp; + lit LitF = lit_neg(Lit); + int i; + // iterate through the literals + ppPrev = p->pWatches + Lit; + for ( pCur = p->pWatches[Lit]; pCur; pCur = *ppPrev ) + { + // make sure the false literal is in the second literal of the clause + if ( pCur->pLits[0] == LitF ) + { + pCur->pLits[0] = pCur->pLits[1]; + pCur->pLits[1] = LitF; + pTemp = pCur->pNext0; + pCur->pNext0 = pCur->pNext1; + pCur->pNext1 = pTemp; + } + assert( pCur->pLits[1] == LitF ); + + // if the first literal is true, the clause is satisfied + if ( pCur->pLits[0] == p->pAssigns[lit_var(pCur->pLits[0])] ) + { + ppPrev = &pCur->pNext1; + continue; + } + + // look for a new literal to watch + for ( i = 2; i < (int)pCur->nLits; i++ ) + { + // skip the case when the literal is false + if ( lit_neg(pCur->pLits[i]) == p->pAssigns[lit_var(pCur->pLits[i])] ) + continue; + // the literal is either true or unassigned - watch it + pCur->pLits[1] = pCur->pLits[i]; + pCur->pLits[i] = LitF; + // remove this clause from the watch list of Lit + *ppPrev = pCur->pNext1; + // add this clause to the watch list of pCur->pLits[i] (now it is pCur->pLits[1]) + Int_ManWatchClause( p, pCur, pCur->pLits[1] ); + break; + } + if ( i < (int)pCur->nLits ) // found new watch + continue; + + // clause is unit - enqueue new implication + if ( Int_ManEnqueue(p, pCur->pLits[0], pCur) ) + { + ppPrev = &pCur->pNext1; + continue; + } + + // conflict detected - return the conflict clause + return pCur; + } + return NULL; +} + +/**Function************************************************************* + + Synopsis [Propagate the current assignments.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Sto_Cls_t * Int_ManPropagate( Int_Man_t * p, int Start ) +{ + Sto_Cls_t * pClause; + int i; + int clk = clock(); + for ( i = Start; i < p->nTrailSize; i++ ) + { + pClause = Int_ManPropagateOne( p, p->pTrail[i] ); + if ( pClause ) + { +p->timeBcp += clock() - clk; + return pClause; + } + } +p->timeBcp += clock() - clk; + return NULL; +} + + +/**Function************************************************************* + + Synopsis [Writes one root clause into a file.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Int_ManProofWriteOne( Int_Man_t * p, Sto_Cls_t * pClause ) +{ + Int_ManProofSet( p, pClause, ++p->Counter ); + + if ( p->fProofWrite ) + { + int v; + fprintf( p->pFile, "%d", Int_ManProofGet(p, pClause) ); + for ( v = 0; v < (int)pClause->nLits; v++ ) + fprintf( p->pFile, " %d", lit_print(pClause->pLits[v]) ); + fprintf( p->pFile, " 0 0\n" ); + } +} + +/**Function************************************************************* + + Synopsis [Traces the proof for one clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Int_ManProofTraceOne( Int_Man_t * p, Sto_Cls_t * pConflict, Sto_Cls_t * pFinal ) +{ + Sto_Cls_t * pReason; + int i, v, Var, PrevId; + int fPrint = 0; + int clk = clock(); + + // collect resolvent literals + if ( p->fProofVerif ) + { + assert( (int)pConflict->nLits <= p->nResLitsAlloc ); + memcpy( p->pResLits, pConflict->pLits, sizeof(lit) * pConflict->nLits ); + p->nResLits = pConflict->nLits; + } + + // mark all the variables in the conflict as seen + for ( v = 0; v < (int)pConflict->nLits; v++ ) + p->pSeens[lit_var(pConflict->pLits[v])] = 1; + + // start the anticedents +// pFinal->pAntis = Vec_PtrAlloc( 32 ); +// Vec_PtrPush( pFinal->pAntis, pConflict ); + + if ( p->pCnf->nClausesA ) + Int_ManTruthCopy( Int_ManTruthRead(p, pFinal), Int_ManTruthRead(p, pConflict), p->nWords ); + + // follow the trail backwards + PrevId = Int_ManProofGet(p, pConflict); + for ( i = p->nTrailSize - 1; i >= 0; i-- ) + { + // skip literals that are not involved + Var = lit_var(p->pTrail[i]); + if ( !p->pSeens[Var] ) + continue; + p->pSeens[Var] = 0; + + // skip literals of the resulting clause + pReason = p->pReasons[Var]; + if ( pReason == NULL ) + continue; + assert( p->pTrail[i] == pReason->pLits[0] ); + + // add the variables to seen + for ( v = 1; v < (int)pReason->nLits; v++ ) + p->pSeens[lit_var(pReason->pLits[v])] = 1; + + + // record the reason clause + assert( Int_ManProofGet(p, pReason) > 0 ); + p->Counter++; + if ( p->fProofWrite ) + fprintf( p->pFile, "%d * %d %d 0\n", p->Counter, PrevId, Int_ManProofGet(p, pReason) ); + PrevId = p->Counter; + + if ( p->pCnf->nClausesA ) + { + if ( p->pVarTypes[Var] == 1 ) // var of A + Int_ManTruthOr( Int_ManTruthRead(p, pFinal), Int_ManTruthRead(p, pReason), p->nWords ); + else + Int_ManTruthAnd( Int_ManTruthRead(p, pFinal), Int_ManTruthRead(p, pReason), p->nWords ); + } + + // resolve the temporary resolvent with the reason clause + if ( p->fProofVerif ) + { + int v1, v2; + if ( fPrint ) + Int_ManPrintResolvent( p->pResLits, p->nResLits ); + // check that the var is present in the resolvent + for ( v1 = 0; v1 < p->nResLits; v1++ ) + if ( lit_var(p->pResLits[v1]) == Var ) + break; + if ( v1 == p->nResLits ) + printf( "Recording clause %d: Cannot find variable %d in the temporary resolvent.\n", pFinal->Id, Var ); + if ( p->pResLits[v1] != lit_neg(pReason->pLits[0]) ) + printf( "Recording clause %d: The resolved variable %d is in the wrong polarity.\n", pFinal->Id, Var ); + // remove this variable from the resolvent + assert( lit_var(p->pResLits[v1]) == Var ); + p->nResLits--; + for ( ; v1 < p->nResLits; v1++ ) + p->pResLits[v1] = p->pResLits[v1+1]; + // add variables of the reason clause + for ( v2 = 1; v2 < (int)pReason->nLits; v2++ ) + { + for ( v1 = 0; v1 < p->nResLits; v1++ ) + if ( lit_var(p->pResLits[v1]) == lit_var(pReason->pLits[v2]) ) + break; + // if it is a new variable, add it to the resolvent + if ( v1 == p->nResLits ) + { + if ( p->nResLits == p->nResLitsAlloc ) + printf( "Recording clause %d: Ran out of space for intermediate resolvent.\n", pFinal->Id ); + p->pResLits[ p->nResLits++ ] = pReason->pLits[v2]; + continue; + } + // if the variable is the same, the literal should be the same too + if ( p->pResLits[v1] == pReason->pLits[v2] ) + continue; + // the literal is different + printf( "Recording clause %d: Trying to resolve the clause with more than one opposite literal.\n", pFinal->Id ); + } + } + +// Vec_PtrPush( pFinal->pAntis, pReason ); + } + + // unmark all seen variables +// for ( i = p->nTrailSize - 1; i >= 0; i-- ) +// p->pSeens[lit_var(p->pTrail[i])] = 0; + // check that the literals are unmarked +// for ( i = p->nTrailSize - 1; i >= 0; i-- ) +// assert( p->pSeens[lit_var(p->pTrail[i])] == 0 ); + + // use the resulting clause to check the correctness of resolution + if ( p->fProofVerif ) + { + int v1, v2; + if ( fPrint ) + Int_ManPrintResolvent( p->pResLits, p->nResLits ); + for ( v1 = 0; v1 < p->nResLits; v1++ ) + { + for ( v2 = 0; v2 < (int)pFinal->nLits; v2++ ) + if ( pFinal->pLits[v2] == p->pResLits[v1] ) + break; + if ( v2 < (int)pFinal->nLits ) + continue; + break; + } + if ( v1 < p->nResLits ) + { + printf( "Recording clause %d: The final resolvent is wrong.\n", pFinal->Id ); + Int_ManPrintClause( p, pConflict ); + Int_ManPrintResolvent( p->pResLits, p->nResLits ); + Int_ManPrintClause( p, pFinal ); + } + } +p->timeTrace += clock() - clk; + + // return the proof pointer + if ( p->pCnf->nClausesA ) + { +// Int_ManPrintInterOne( p, pFinal ); + } + Int_ManProofSet( p, pFinal, p->Counter ); + return p->Counter; +} + +/**Function************************************************************* + + Synopsis [Records the proof for one clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Int_ManProofRecordOne( Int_Man_t * p, Sto_Cls_t * pClause ) +{ + Sto_Cls_t * pConflict; + int i; + + // empty clause never ends up there + assert( pClause->nLits > 0 ); + if ( pClause->nLits == 0 ) + printf( "Error: Empty clause is attempted.\n" ); + + // add assumptions to the trail + assert( !pClause->fRoot ); + assert( p->nTrailSize == p->nRootSize ); + for ( i = 0; i < (int)pClause->nLits; i++ ) + if ( !Int_ManEnqueue( p, lit_neg(pClause->pLits[i]), NULL ) ) + { + assert( 0 ); // impossible + return 0; + } + + // propagate the assumptions + pConflict = Int_ManPropagate( p, p->nRootSize ); + if ( pConflict == NULL ) + { + assert( 0 ); // cannot prove + return 0; + } + + // construct the proof + Int_ManProofTraceOne( p, pConflict, pClause ); + + // undo to the root level + Int_ManCancelUntil( p, p->nRootSize ); + + // add large clauses to the watched lists + if ( pClause->nLits > 1 ) + { + Int_ManWatchClause( p, pClause, pClause->pLits[0] ); + Int_ManWatchClause( p, pClause, pClause->pLits[1] ); + return 1; + } + assert( pClause->nLits == 1 ); + + // if the clause proved is unit, add it and propagate + if ( !Int_ManEnqueue( p, pClause->pLits[0], pClause ) ) + { + assert( 0 ); // impossible + return 0; + } + + // propagate the assumption + pConflict = Int_ManPropagate( p, p->nRootSize ); + if ( pConflict ) + { + // construct the proof + Int_ManProofTraceOne( p, pConflict, p->pCnf->pEmpty ); + if ( p->fVerbose ) + printf( "Found last conflict after adding unit clause number %d!\n", pClause->Id ); + return 0; + } + + // update the root level + p->nRootSize = p->nTrailSize; + return 1; +} + +/**Function************************************************************* + + Synopsis [Propagate the root clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Int_ManProcessRoots( Int_Man_t * p ) +{ + Sto_Cls_t * pClause; + int Counter; + + // make sure the root clauses are preceeding the learnt clauses + Counter = 0; + Sto_ManForEachClause( p->pCnf, pClause ) + { + assert( (int)pClause->fA == (Counter < (int)p->pCnf->nClausesA) ); + assert( (int)pClause->fRoot == (Counter < (int)p->pCnf->nRoots) ); + Counter++; + } + assert( p->pCnf->nClauses == Counter ); + + // make sure the last clause if empty + assert( p->pCnf->pTail->nLits == 0 ); + + // go through the root unit clauses + p->nTrailSize = 0; + Sto_ManForEachClauseRoot( p->pCnf, pClause ) + { + // create watcher lists for the root clauses + if ( pClause->nLits > 1 ) + { + Int_ManWatchClause( p, pClause, pClause->pLits[0] ); + Int_ManWatchClause( p, pClause, pClause->pLits[1] ); + } + // empty clause and large clauses + if ( pClause->nLits != 1 ) + continue; + // unit clause + assert( lit_check(pClause->pLits[0], p->pCnf->nVars) ); + if ( !Int_ManEnqueue( p, pClause->pLits[0], pClause ) ) + { + // detected root level conflict + printf( "Error in Int_ManProcessRoots(): Detected a root-level conflict too early!\n" ); + assert( 0 ); + return 0; + } + } + + // propagate the root unit clauses + pClause = Int_ManPropagate( p, 0 ); + if ( pClause ) + { + // detected root level conflict + Int_ManProofTraceOne( p, pClause, p->pCnf->pEmpty ); + if ( p->fVerbose ) + printf( "Found root level conflict!\n" ); + return 0; + } + + // set the root level + p->nRootSize = p->nTrailSize; + return 1; +} + +/**Function************************************************************* + + Synopsis [Records the proof.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Int_ManPrepareInter( Int_Man_t * p ) +{ + // elementary truth tables + unsigned uTruths[8][8] = { + { 0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA,0xAAAAAAAA }, + { 0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC,0xCCCCCCCC }, + { 0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0,0xF0F0F0F0 }, + { 0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00,0xFF00FF00 }, + { 0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000,0xFFFF0000 }, + { 0x00000000,0xFFFFFFFF,0x00000000,0xFFFFFFFF,0x00000000,0xFFFFFFFF,0x00000000,0xFFFFFFFF }, + { 0x00000000,0x00000000,0xFFFFFFFF,0xFFFFFFFF,0x00000000,0x00000000,0xFFFFFFFF,0xFFFFFFFF }, + { 0x00000000,0x00000000,0x00000000,0x00000000,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF } + }; + Sto_Cls_t * pClause; + int Var, VarAB, v; + assert( p->nVarsAB <= 8 ); + + // set interpolants for root clauses + Sto_ManForEachClauseRoot( p->pCnf, pClause ) + { + if ( !pClause->fA ) // clause of B + { + Int_ManTruthFill( Int_ManTruthRead(p, pClause), p->nWords ); +// Int_ManPrintInterOne( p, pClause ); + continue; + } + // clause of A + Int_ManTruthClear( Int_ManTruthRead(p, pClause), p->nWords ); + for ( v = 0; v < (int)pClause->nLits; v++ ) + { + Var = lit_var(pClause->pLits[v]); + if ( p->pVarTypes[Var] < 0 ) // global var + { + VarAB = -p->pVarTypes[Var]-1; + assert( VarAB >= 0 && VarAB < p->nVarsAB ); + if ( lit_sign(pClause->pLits[v]) ) // negative var + Int_ManTruthOrNot( Int_ManTruthRead(p, pClause), uTruths[VarAB], p->nWords ); + else + Int_ManTruthOr( Int_ManTruthRead(p, pClause), uTruths[VarAB], p->nWords ); + } + } +// Int_ManPrintInterOne( p, pClause ); + } +} + +/**Function************************************************************* + + Synopsis [Computes interpolant for the given CNF.] + + Description [Returns the number of common variable found and interpolant. + Returns 0, if something did not work.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Int_ManInterpolate( Int_Man_t * p, Sto_Man_t * pCnf, int fVerbose, unsigned ** ppResult ) +{ + Sto_Cls_t * pClause; + int RetValue = 1; + int clkTotal = clock(); + + // check that the CNF makes sense + assert( pCnf->nVars > 0 && pCnf->nClauses > 0 ); + p->pCnf = pCnf; + p->fVerbose = fVerbose; + *ppResult = NULL; + + // adjust the manager + Int_ManResize( p ); + + // prepare the interpolant computation + Int_ManPrepareInter( p ); + + // construct proof for each clause + // start the proof + if ( p->fProofWrite ) + { + p->pFile = fopen( "proof.cnf_", "w" ); + p->Counter = 0; + } + + // write the root clauses + Sto_ManForEachClauseRoot( p->pCnf, pClause ) + Int_ManProofWriteOne( p, pClause ); + + // propagate root level assignments + if ( Int_ManProcessRoots( p ) ) + { + // if there is no conflict, consider learned clauses + Sto_ManForEachClause( p->pCnf, pClause ) + { + if ( pClause->fRoot ) + continue; + if ( !Int_ManProofRecordOne( p, pClause ) ) + { + RetValue = 0; + break; + } + } + } + + // stop the proof + if ( p->fProofWrite ) + { + fclose( p->pFile ); + p->pFile = NULL; + } + + if ( fVerbose ) + { + printf( "Vars = %d. Roots = %d. Learned = %d. Resol steps = %d. Ave = %.2f. Mem = %.2f Mb\n", + p->pCnf->nVars, p->pCnf->nRoots, p->pCnf->nClauses-p->pCnf->nRoots, p->Counter, + 1.0*(p->Counter-p->pCnf->nRoots)/(p->pCnf->nClauses-p->pCnf->nRoots), + 1.0*Sto_ManMemoryReport(p->pCnf)/(1<<20) ); +p->timeTotal += clock() - clkTotal; + } + + *ppResult = Int_ManTruthRead( p, p->pCnf->pTail ); + return p->nVarsAB; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/bsat/satMem.c b/src/sat/bsat/satMem.c new file mode 100644 index 00000000..7fa1a824 --- /dev/null +++ b/src/sat/bsat/satMem.c @@ -0,0 +1,527 @@ +/**CFile**************************************************************** + + FileName [satMem.c] + + PackageName [SAT solver.] + + Synopsis [Memory management.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: satMem.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "satMem.h" +#include "vec.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +struct Sat_MmFixed_t_ +{ + // information about individual entries + int nEntrySize; // the size of one entry + int nEntriesAlloc; // the total number of entries allocated + int nEntriesUsed; // the number of entries in use + int nEntriesMax; // the max number of entries in use + char * pEntriesFree; // the linked list of free entries + + // this is where the memory is stored + int nChunkSize; // the size of one chunk + int nChunksAlloc; // the maximum number of memory chunks + int nChunks; // the current number of memory chunks + char ** pChunks; // the allocated memory + + // statistics + int nMemoryUsed; // memory used in the allocated entries + int nMemoryAlloc; // memory allocated +}; + +struct Sat_MmFlex_t_ +{ + // information about individual entries + int nEntriesUsed; // the number of entries allocated + char * pCurrent; // the current pointer to free memory + char * pEnd; // the first entry outside the free memory + + // this is where the memory is stored + int nChunkSize; // the size of one chunk + int nChunksAlloc; // the maximum number of memory chunks + int nChunks; // the current number of memory chunks + char ** pChunks; // the allocated memory + + // statistics + int nMemoryUsed; // memory used in the allocated entries + int nMemoryAlloc; // memory allocated +}; + +struct Sat_MmStep_t_ +{ + int nMems; // the number of fixed memory managers employed + Sat_MmFixed_t ** pMems; // memory managers: 2^1 words, 2^2 words, etc + int nMapSize; // the size of the memory array + Sat_MmFixed_t ** pMap; // maps the number of bytes into its memory manager +}; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates memory pieces of fixed size.] + + Description [The size of the chunk is computed as the minimum of + 1024 entries and 64K. Can only work with entry size at least 4 byte long.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Sat_MmFixed_t * Sat_MmFixedStart( int nEntrySize ) +{ + Sat_MmFixed_t * p; + + p = ALLOC( Sat_MmFixed_t, 1 ); + memset( p, 0, sizeof(Sat_MmFixed_t) ); + + p->nEntrySize = nEntrySize; + p->nEntriesAlloc = 0; + p->nEntriesUsed = 0; + p->pEntriesFree = NULL; + + if ( nEntrySize * (1 << 10) < (1<<16) ) + p->nChunkSize = (1 << 10); + else + p->nChunkSize = (1<<16) / nEntrySize; + if ( p->nChunkSize < 8 ) + p->nChunkSize = 8; + + p->nChunksAlloc = 64; + p->nChunks = 0; + p->pChunks = ALLOC( char *, p->nChunksAlloc ); + + p->nMemoryUsed = 0; + p->nMemoryAlloc = 0; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_MmFixedStop( Sat_MmFixed_t * p, int fVerbose ) +{ + int i; + if ( p == NULL ) + return; + if ( fVerbose ) + { + printf( "Fixed memory manager: Entry = %5d. Chunk = %5d. Chunks used = %5d.\n", + p->nEntrySize, p->nChunkSize, p->nChunks ); + printf( " Entries used = %8d. Entries peak = %8d. Memory used = %8d. Memory alloc = %8d.\n", + p->nEntriesUsed, p->nEntriesMax, p->nEntrySize * p->nEntriesUsed, p->nMemoryAlloc ); + } + for ( i = 0; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + free( p->pChunks ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Sat_MmFixedEntryFetch( Sat_MmFixed_t * p ) +{ + char * pTemp; + int i; + + // check if there are still free entries + if ( p->nEntriesUsed == p->nEntriesAlloc ) + { // need to allocate more entries + assert( p->pEntriesFree == NULL ); + if ( p->nChunks == p->nChunksAlloc ) + { + p->nChunksAlloc *= 2; + p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); + } + p->pEntriesFree = ALLOC( char, p->nEntrySize * p->nChunkSize ); + p->nMemoryAlloc += p->nEntrySize * p->nChunkSize; + // transform these entries into a linked list + pTemp = p->pEntriesFree; + for ( i = 1; i < p->nChunkSize; i++ ) + { + *((char **)pTemp) = pTemp + p->nEntrySize; + pTemp += p->nEntrySize; + } + // set the last link + *((char **)pTemp) = NULL; + // add the chunk to the chunk storage + p->pChunks[ p->nChunks++ ] = p->pEntriesFree; + // add to the number of entries allocated + p->nEntriesAlloc += p->nChunkSize; + } + // incrememt the counter of used entries + p->nEntriesUsed++; + if ( p->nEntriesMax < p->nEntriesUsed ) + p->nEntriesMax = p->nEntriesUsed; + // return the first entry in the free entry list + pTemp = p->pEntriesFree; + p->pEntriesFree = *((char **)pTemp); + return pTemp; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_MmFixedEntryRecycle( Sat_MmFixed_t * p, char * pEntry ) +{ + // decrement the counter of used entries + p->nEntriesUsed--; + // add the entry to the linked list of free entries + *((char **)pEntry) = p->pEntriesFree; + p->pEntriesFree = pEntry; +} + +/**Function************************************************************* + + Synopsis [] + + Description [Relocates all the memory except the first chunk.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_MmFixedRestart( Sat_MmFixed_t * p ) +{ + int i; + char * pTemp; + + // deallocate all chunks except the first one + for ( i = 1; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + p->nChunks = 1; + // transform these entries into a linked list + pTemp = p->pChunks[0]; + for ( i = 1; i < p->nChunkSize; i++ ) + { + *((char **)pTemp) = pTemp + p->nEntrySize; + pTemp += p->nEntrySize; + } + // set the last link + *((char **)pTemp) = NULL; + // set the free entry list + p->pEntriesFree = p->pChunks[0]; + // set the correct statistics + p->nMemoryAlloc = p->nEntrySize * p->nChunkSize; + p->nMemoryUsed = 0; + p->nEntriesAlloc = p->nChunkSize; + p->nEntriesUsed = 0; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Sat_MmFixedReadMemUsage( Sat_MmFixed_t * p ) +{ + return p->nMemoryAlloc; +} + + + +/**Function************************************************************* + + Synopsis [Allocates entries of flexible size.] + + Description [Can only work with entry size at least 4 byte long.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Sat_MmFlex_t * Sat_MmFlexStart() +{ + Sat_MmFlex_t * p; + + p = ALLOC( Sat_MmFlex_t, 1 ); + memset( p, 0, sizeof(Sat_MmFlex_t) ); + + p->nEntriesUsed = 0; + p->pCurrent = NULL; + p->pEnd = NULL; + + p->nChunkSize = (1 << 12); + p->nChunksAlloc = 64; + p->nChunks = 0; + p->pChunks = ALLOC( char *, p->nChunksAlloc ); + + p->nMemoryUsed = 0; + p->nMemoryAlloc = 0; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_MmFlexStop( Sat_MmFlex_t * p, int fVerbose ) +{ + int i; + if ( p == NULL ) + return; + if ( fVerbose ) + { + printf( "Flexible memory manager: Chunk size = %d. Chunks used = %d.\n", + p->nChunkSize, p->nChunks ); + printf( " Entries used = %d. Memory used = %d. Memory alloc = %d.\n", + p->nEntriesUsed, p->nMemoryUsed, p->nMemoryAlloc ); + } + for ( i = 0; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + free( p->pChunks ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Sat_MmFlexEntryFetch( Sat_MmFlex_t * p, int nBytes ) +{ + char * pTemp; + // check if there are still free entries + if ( p->pCurrent == NULL || p->pCurrent + nBytes > p->pEnd ) + { // need to allocate more entries + if ( p->nChunks == p->nChunksAlloc ) + { + p->nChunksAlloc *= 2; + p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); + } + if ( nBytes > p->nChunkSize ) + { + // resize the chunk size if more memory is requested than it can give + // (ideally, this should never happen) + p->nChunkSize = 2 * nBytes; + } + p->pCurrent = ALLOC( char, p->nChunkSize ); + p->pEnd = p->pCurrent + p->nChunkSize; + p->nMemoryAlloc += p->nChunkSize; + // add the chunk to the chunk storage + p->pChunks[ p->nChunks++ ] = p->pCurrent; + } + assert( p->pCurrent + nBytes <= p->pEnd ); + // increment the counter of used entries + p->nEntriesUsed++; + // keep track of the memory used + p->nMemoryUsed += nBytes; + // return the next entry + pTemp = p->pCurrent; + p->pCurrent += nBytes; + return pTemp; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Sat_MmFlexReadMemUsage( Sat_MmFlex_t * p ) +{ + return p->nMemoryAlloc; +} + + + + + +/**Function************************************************************* + + Synopsis [Starts the hierarchical memory manager.] + + Description [This manager can allocate entries of any size. + Iternally they are mapped into the entries with the number of bytes + equal to the power of 2. The smallest entry size is 8 bytes. The + next one is 16 bytes etc. So, if the user requests 6 bytes, he gets + 8 byte entry. If we asks for 25 bytes, he gets 32 byte entry etc. + The input parameters "nSteps" says how many fixed memory managers + are employed internally. Calling this procedure with nSteps equal + to 10 results in 10 hierarchically arranged internal memory managers, + which can allocate up to 4096 (1Kb) entries. Requests for larger + entries are handed over to malloc() and then free()ed.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Sat_MmStep_t * Sat_MmStepStart( int nSteps ) +{ + Sat_MmStep_t * p; + int i, k; + p = ALLOC( Sat_MmStep_t, 1 ); + p->nMems = nSteps; + // start the fixed memory managers + p->pMems = ALLOC( Sat_MmFixed_t *, p->nMems ); + for ( i = 0; i < p->nMems; i++ ) + p->pMems[i] = Sat_MmFixedStart( (8<<i) ); + // set up the mapping of the required memory size into the corresponding manager + p->nMapSize = (4<<p->nMems); + p->pMap = ALLOC( Sat_MmFixed_t *, p->nMapSize+1 ); + p->pMap[0] = NULL; + for ( k = 1; k <= 4; k++ ) + p->pMap[k] = p->pMems[0]; + for ( i = 0; i < p->nMems; i++ ) + for ( k = (4<<i)+1; k <= (8<<i); k++ ) + p->pMap[k] = p->pMems[i]; +//for ( i = 1; i < 100; i ++ ) +//printf( "%10d: size = %10d\n", i, p->pMap[i]->nEntrySize ); + return p; +} + +/**Function************************************************************* + + Synopsis [Stops the memory manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_MmStepStop( Sat_MmStep_t * p, int fVerbose ) +{ + int i; + for ( i = 0; i < p->nMems; i++ ) + Sat_MmFixedStop( p->pMems[i], fVerbose ); + free( p->pMems ); + free( p->pMap ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Creates the entry.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Sat_MmStepEntryFetch( Sat_MmStep_t * p, int nBytes ) +{ + if ( nBytes == 0 ) + return NULL; + if ( nBytes > p->nMapSize ) + { +// printf( "Allocating %d bytes.\n", nBytes ); + return ALLOC( char, nBytes ); + } + return Sat_MmFixedEntryFetch( p->pMap[nBytes] ); +} + + +/**Function************************************************************* + + Synopsis [Recycles the entry.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_MmStepEntryRecycle( Sat_MmStep_t * p, char * pEntry, int nBytes ) +{ + if ( nBytes == 0 ) + return; + if ( nBytes > p->nMapSize ) + { + free( pEntry ); + return; + } + Sat_MmFixedEntryRecycle( p->pMap[nBytes], pEntry ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Sat_MmStepReadMemUsage( Sat_MmStep_t * p ) +{ + int i, nMemTotal = 0; + for ( i = 0; i < p->nMems; i++ ) + nMemTotal += p->pMems[i]->nMemoryAlloc; + return nMemTotal; +} diff --git a/src/sat/bsat/satMem.h b/src/sat/bsat/satMem.h new file mode 100644 index 00000000..22b7a87c --- /dev/null +++ b/src/sat/bsat/satMem.h @@ -0,0 +1,80 @@ +/**CFile**************************************************************** + + FileName [satMem.h] + + PackageName [SAT solver.] + + Synopsis [Memory management.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: satMem.h,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#ifndef __SAT_MEM_H__ +#define __SAT_MEM_H__ + +//////////////////////////////////////////////////////////////////////// +/// INCLUDES /// +//////////////////////////////////////////////////////////////////////// + +//#include "leaks.h" +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> + +//////////////////////////////////////////////////////////////////////// +/// PARAMETERS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// STRUCTURE DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +typedef struct Sat_MmFixed_t_ Sat_MmFixed_t; +typedef struct Sat_MmFlex_t_ Sat_MmFlex_t; +typedef struct Sat_MmStep_t_ Sat_MmStep_t; + +//////////////////////////////////////////////////////////////////////// +/// GLOBAL VARIABLES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// MACRO DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +// fixed-size-block memory manager +extern Sat_MmFixed_t * Sat_MmFixedStart( int nEntrySize ); +extern void Sat_MmFixedStop( Sat_MmFixed_t * p, int fVerbose ); +extern char * Sat_MmFixedEntryFetch( Sat_MmFixed_t * p ); +extern void Sat_MmFixedEntryRecycle( Sat_MmFixed_t * p, char * pEntry ); +extern void Sat_MmFixedRestart( Sat_MmFixed_t * p ); +extern int Sat_MmFixedReadMemUsage( Sat_MmFixed_t * p ); +// flexible-size-block memory manager +extern Sat_MmFlex_t * Sat_MmFlexStart(); +extern void Sat_MmFlexStop( Sat_MmFlex_t * p, int fVerbose ); +extern char * Sat_MmFlexEntryFetch( Sat_MmFlex_t * p, int nBytes ); +extern int Sat_MmFlexReadMemUsage( Sat_MmFlex_t * p ); +// hierarchical memory manager +extern Sat_MmStep_t * Sat_MmStepStart( int nSteps ); +extern void Sat_MmStepStop( Sat_MmStep_t * p, int fVerbose ); +extern char * Sat_MmStepEntryFetch( Sat_MmStep_t * p, int nBytes ); +extern void Sat_MmStepEntryRecycle( Sat_MmStep_t * p, char * pEntry, int nBytes ); +extern int Sat_MmStepReadMemUsage( Sat_MmStep_t * p ); + +#endif + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + diff --git a/src/sat/bsat/satSolver.c b/src/sat/bsat/satSolver.c new file mode 100644 index 00000000..fbc9874d --- /dev/null +++ b/src/sat/bsat/satSolver.c @@ -0,0 +1,1358 @@ +/************************************************************************************************** +MiniSat -- Copyright (c) 2005, Niklas Sorensson +http://www.cs.chalmers.se/Cs/Research/FormalMethods/MiniSat/ + +Permission is hereby granted, free of charge, to any person obtaining a copy of this software and +associated documentation files (the "Software"), to deal in the Software without restriction, +including without limitation the rights to use, copy, modify, merge, publish, distribute, +sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all copies or +substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT +NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT +OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +**************************************************************************************************/ +// Modified to compile with MS Visual Studio 6.0 by Alan Mishchenko + +#include <stdio.h> +#include <assert.h> +#include <string.h> +#include <math.h> + +#include "satSolver.h" + +//#define SAT_USE_SYSTEM_MEMORY_MANAGEMENT + +//================================================================================================= +// Debug: + +//#define VERBOSEDEBUG + +// For derivation output (verbosity level 2) +#define L_IND "%-*d" +#define L_ind sat_solver_dlevel(s)*3+3,sat_solver_dlevel(s) +#define L_LIT "%sx%d" +#define L_lit(p) lit_sign(p)?"~":"", (lit_var(p)) + +// Just like 'assert()' but expression will be evaluated in the release version as well. +static inline void check(int expr) { assert(expr); } + +static void printlits(lit* begin, lit* end) +{ + int i; + for (i = 0; i < end - begin; i++) + printf(L_LIT" ",L_lit(begin[i])); +} + +//================================================================================================= +// Random numbers: + + +// Returns a random float 0 <= x < 1. Seed must never be 0. +static inline double drand(double* seed) { + int q; + *seed *= 1389796; + q = (int)(*seed / 2147483647); + *seed -= (double)q * 2147483647; + return *seed / 2147483647; } + + +// Returns a random integer 0 <= x < size. Seed must never be 0. +static inline int irand(double* seed, int size) { + return (int)(drand(seed) * size); } + + +//================================================================================================= +// Predeclarations: + +static void sat_solver_sort(void** array, int size, int(*comp)(const void *, const void *)); + +//================================================================================================= +// Clause datatype + minor functions: + +struct clause_t +{ + int size_learnt; + lit lits[0]; +}; + +static inline int clause_size (clause* c) { return c->size_learnt >> 1; } +static inline lit* clause_begin (clause* c) { return c->lits; } +static inline int clause_learnt (clause* c) { return c->size_learnt & 1; } +static inline float clause_activity (clause* c) { return *((float*)&c->lits[c->size_learnt>>1]); } +static inline void clause_setactivity(clause* c, float a) { *((float*)&c->lits[c->size_learnt>>1]) = a; } + +//================================================================================================= +// Encode literals in clause pointers: + +static inline clause* clause_from_lit (lit l) { return (clause*)((unsigned long)l + (unsigned long)l + 1); } +static inline bool clause_is_lit (clause* c) { return ((unsigned long)c & 1); } +static inline lit clause_read_lit (clause* c) { return (lit)((unsigned long)c >> 1); } + +//================================================================================================= +// Simple helpers: + +static inline int sat_solver_dlevel(sat_solver* s) { return veci_size(&s->trail_lim); } +static inline vecp* sat_solver_read_wlist(sat_solver* s, lit l) { return &s->wlists[l]; } +static inline void vecp_remove(vecp* v, void* e) +{ + void** ws = vecp_begin(v); + int j = 0; + for (; ws[j] != e ; j++); + assert(j < vecp_size(v)); + for (; j < vecp_size(v)-1; j++) ws[j] = ws[j+1]; + vecp_resize(v,vecp_size(v)-1); +} + +//================================================================================================= +// Variable order functions: + +static inline void order_update(sat_solver* s, int v) // updateorder +{ + int* orderpos = s->orderpos; + double* activity = s->activity; + int* heap = veci_begin(&s->order); + int i = orderpos[v]; + int x = heap[i]; + int parent = (i - 1) / 2; + + assert(s->orderpos[v] != -1); + + while (i != 0 && activity[x] > activity[heap[parent]]){ + heap[i] = heap[parent]; + orderpos[heap[i]] = i; + i = parent; + parent = (i - 1) / 2; + } + heap[i] = x; + orderpos[x] = i; +} + +static inline void order_assigned(sat_solver* s, int v) +{ +} + +static inline void order_unassigned(sat_solver* s, int v) // undoorder +{ + int* orderpos = s->orderpos; + if (orderpos[v] == -1){ + orderpos[v] = veci_size(&s->order); + veci_push(&s->order,v); + order_update(s,v); +//printf( "+%d ", v ); + } +} + +static inline int order_select(sat_solver* s, float random_var_freq) // selectvar +{ + int* heap; + double* activity; + int* orderpos; + + lbool* values = s->assigns; + + // Random decision: + if (drand(&s->random_seed) < random_var_freq){ + int next = irand(&s->random_seed,s->size); + assert(next >= 0 && next < s->size); + if (values[next] == l_Undef) + return next; + } + + // Activity based decision: + + heap = veci_begin(&s->order); + activity = s->activity; + orderpos = s->orderpos; + + + while (veci_size(&s->order) > 0){ + int next = heap[0]; + int size = veci_size(&s->order)-1; + int x = heap[size]; + + veci_resize(&s->order,size); + + orderpos[next] = -1; + + if (size > 0){ + double act = activity[x]; + + int i = 0; + int child = 1; + + + while (child < size){ + if (child+1 < size && activity[heap[child]] < activity[heap[child+1]]) + child++; + + assert(child < size); + + if (act >= activity[heap[child]]) + break; + + heap[i] = heap[child]; + orderpos[heap[i]] = i; + i = child; + child = 2 * child + 1; + } + heap[i] = x; + orderpos[heap[i]] = i; + } + +//printf( "-%d ", next ); + if (values[next] == l_Undef) + return next; + } + + return var_Undef; +} + +//================================================================================================= +// Activity functions: + +static inline void act_var_rescale(sat_solver* s) { + double* activity = s->activity; + int i; + for (i = 0; i < s->size; i++) + activity[i] *= 1e-100; + s->var_inc *= 1e-100; +} + +static inline void act_var_bump(sat_solver* s, int v) { + s->activity[v] += s->var_inc; + if (s->activity[v] > 1e100) + act_var_rescale(s); + //printf("bump %d %f\n", v-1, activity[v]); + if (s->orderpos[v] != -1) + order_update(s,v); +} + +static inline void act_var_bump_factor(sat_solver* s, int v) { + s->activity[v] += (s->var_inc * s->factors[v]); + if (s->activity[v] > 1e100) + act_var_rescale(s); + //printf("bump %d %f\n", v-1, activity[v]); + if (s->orderpos[v] != -1) + order_update(s,v); +} + +static inline void act_var_decay(sat_solver* s) { s->var_inc *= s->var_decay; } + +static inline void act_clause_rescale(sat_solver* s) { + clause** cs = (clause**)vecp_begin(&s->learnts); + int i; + for (i = 0; i < vecp_size(&s->learnts); i++){ + float a = clause_activity(cs[i]); + clause_setactivity(cs[i], a * (float)1e-20); + } + s->cla_inc *= (float)1e-20; +} + + +static inline void act_clause_bump(sat_solver* s, clause *c) { + float a = clause_activity(c) + s->cla_inc; + clause_setactivity(c,a); + if (a > 1e20) act_clause_rescale(s); +} + +static inline void act_clause_decay(sat_solver* s) { s->cla_inc *= s->cla_decay; } + +//================================================================================================= +// Clause functions: + +/* pre: size > 1 && no variable occurs twice + */ +static clause* clause_new(sat_solver* s, lit* begin, lit* end, int learnt) +{ + int size; + clause* c; + int i; + + assert(end - begin > 1); + assert(learnt >= 0 && learnt < 2); + size = end - begin; +// c = (clause*)malloc(sizeof(clause) + sizeof(lit) * size + learnt * sizeof(float)); +#ifdef SAT_USE_SYSTEM_MEMORY_MANAGEMENT + c = (clause*)malloc(sizeof(clause) + sizeof(lit) * size + learnt * sizeof(float)); +#else + c = (clause*)Sat_MmStepEntryFetch( s->pMem, sizeof(clause) + sizeof(lit) * size + learnt * sizeof(float) ); +#endif + + c->size_learnt = (size << 1) | learnt; + assert(((unsigned long)c & 1) == 0); + + for (i = 0; i < size; i++) + c->lits[i] = begin[i]; + + if (learnt) + *((float*)&c->lits[size]) = 0.0; + + assert(begin[0] >= 0); + assert(begin[0] < s->size*2); + assert(begin[1] >= 0); + assert(begin[1] < s->size*2); + + assert(lit_neg(begin[0]) < s->size*2); + assert(lit_neg(begin[1]) < s->size*2); + + //vecp_push(sat_solver_read_wlist(s,lit_neg(begin[0])),(void*)c); + //vecp_push(sat_solver_read_wlist(s,lit_neg(begin[1])),(void*)c); + + vecp_push(sat_solver_read_wlist(s,lit_neg(begin[0])),(void*)(size > 2 ? c : clause_from_lit(begin[1]))); + vecp_push(sat_solver_read_wlist(s,lit_neg(begin[1])),(void*)(size > 2 ? c : clause_from_lit(begin[0]))); + + return c; +} + + +static void clause_remove(sat_solver* s, clause* c) +{ + lit* lits = clause_begin(c); + assert(lit_neg(lits[0]) < s->size*2); + assert(lit_neg(lits[1]) < s->size*2); + + //vecp_remove(sat_solver_read_wlist(s,lit_neg(lits[0])),(void*)c); + //vecp_remove(sat_solver_read_wlist(s,lit_neg(lits[1])),(void*)c); + + assert(lits[0] < s->size*2); + vecp_remove(sat_solver_read_wlist(s,lit_neg(lits[0])),(void*)(clause_size(c) > 2 ? c : clause_from_lit(lits[1]))); + vecp_remove(sat_solver_read_wlist(s,lit_neg(lits[1])),(void*)(clause_size(c) > 2 ? c : clause_from_lit(lits[0]))); + + if (clause_learnt(c)){ + s->stats.learnts--; + s->stats.learnts_literals -= clause_size(c); + }else{ + s->stats.clauses--; + s->stats.clauses_literals -= clause_size(c); + } + +#ifdef SAT_USE_SYSTEM_MEMORY_MANAGEMENT + free(c); +#else + Sat_MmStepEntryRecycle( s->pMem, (char *)c, sizeof(clause) + sizeof(lit) * clause_size(c) + clause_learnt(c) * sizeof(float) ); +#endif +} + + +static lbool clause_simplify(sat_solver* s, clause* c) +{ + lit* lits = clause_begin(c); + lbool* values = s->assigns; + int i; + + assert(sat_solver_dlevel(s) == 0); + + for (i = 0; i < clause_size(c); i++){ + lbool sig = !lit_sign(lits[i]); sig += sig - 1; + if (values[lit_var(lits[i])] == sig) + return l_True; + } + return l_False; +} + +//================================================================================================= +// Minor (solver) functions: + +void sat_solver_setnvars(sat_solver* s,int n) +{ + int var; + + if (s->cap < n){ + + while (s->cap < n) s->cap = s->cap*2+1; + + s->wlists = (vecp*) realloc(s->wlists, sizeof(vecp)*s->cap*2); + s->activity = (double*) realloc(s->activity, sizeof(double)*s->cap); + s->factors = (double*) realloc(s->factors, sizeof(double)*s->cap); + s->assigns = (lbool*) realloc(s->assigns, sizeof(lbool)*s->cap); + s->orderpos = (int*) realloc(s->orderpos, sizeof(int)*s->cap); + s->reasons = (clause**)realloc(s->reasons, sizeof(clause*)*s->cap); + s->levels = (int*) realloc(s->levels, sizeof(int)*s->cap); + s->tags = (lbool*) realloc(s->tags, sizeof(lbool)*s->cap); + s->trail = (lit*) realloc(s->trail, sizeof(lit)*s->cap); + } + + for (var = s->size; var < n; var++){ + vecp_new(&s->wlists[2*var]); + vecp_new(&s->wlists[2*var+1]); + s->activity [var] = 0; + s->factors [var] = 0; + s->assigns [var] = l_Undef; + s->orderpos [var] = veci_size(&s->order); + s->reasons [var] = (clause*)0; + s->levels [var] = 0; + s->tags [var] = l_Undef; + + /* does not hold because variables enqueued at top level will not be reinserted in the heap + assert(veci_size(&s->order) == var); + */ + veci_push(&s->order,var); + order_update(s, var); + } + + s->size = n > s->size ? n : s->size; +} + + +static inline bool enqueue(sat_solver* s, lit l, clause* from) +{ + lbool* values = s->assigns; + int v = lit_var(l); + lbool val = values[v]; +#ifdef VERBOSEDEBUG + printf(L_IND"enqueue("L_LIT")\n", L_ind, L_lit(l)); +#endif + + lbool sig = !lit_sign(l); sig += sig - 1; + if (val != l_Undef){ + return val == sig; + }else{ + // New fact -- store it. +#ifdef VERBOSEDEBUG + printf(L_IND"bind("L_LIT")\n", L_ind, L_lit(l)); +#endif + int* levels = s->levels; + clause** reasons = s->reasons; + + values [v] = sig; + levels [v] = sat_solver_dlevel(s); + reasons[v] = from; + s->trail[s->qtail++] = l; + + order_assigned(s, v); + return true; + } +} + + +static inline void assume(sat_solver* s, lit l){ + assert(s->qtail == s->qhead); + assert(s->assigns[lit_var(l)] == l_Undef); +#ifdef VERBOSEDEBUG + printf(L_IND"assume("L_LIT")\n", L_ind, L_lit(l)); +#endif + veci_push(&s->trail_lim,s->qtail); + enqueue(s,l,(clause*)0); +} + + +static void sat_solver_canceluntil(sat_solver* s, int level) { + lit* trail; + lbool* values; + clause** reasons; + int bound; + int c; + + if (sat_solver_dlevel(s) <= level) + return; + + trail = s->trail; + values = s->assigns; + reasons = s->reasons; + bound = (veci_begin(&s->trail_lim))[level]; + + //////////////////////////////////////// + // added to cancel all assignments +// if ( level == -1 ) +// bound = 0; + //////////////////////////////////////// + + for (c = s->qtail-1; c >= bound; c--) { + int x = lit_var(trail[c]); + values [x] = l_Undef; + reasons[x] = (clause*)0; + } + + for (c = s->qhead-1; c >= bound; c--) + order_unassigned(s,lit_var(trail[c])); + + s->qhead = s->qtail = bound; + veci_resize(&s->trail_lim,level); +} + +static void sat_solver_record(sat_solver* s, veci* cls) +{ + lit* begin = veci_begin(cls); + lit* end = begin + veci_size(cls); + clause* c = (veci_size(cls) > 1) ? clause_new(s,begin,end,1) : (clause*)0; + enqueue(s,*begin,c); + + /////////////////////////////////// + // add clause to internal storage + if ( s->pStore ) + { + extern int Sto_ManAddClause( void * p, lit * pBeg, lit * pEnd ); + int RetValue = Sto_ManAddClause( s->pStore, begin, end ); + assert( RetValue ); + } + /////////////////////////////////// + + assert(veci_size(cls) > 0); + + if (c != 0) { + vecp_push(&s->learnts,c); + act_clause_bump(s,c); + s->stats.learnts++; + s->stats.learnts_literals += veci_size(cls); + } +} + + +static double sat_solver_progress(sat_solver* s) +{ + lbool* values = s->assigns; + int* levels = s->levels; + int i; + + double progress = 0; + double F = 1.0 / s->size; + for (i = 0; i < s->size; i++) + if (values[i] != l_Undef) + progress += pow(F, levels[i]); + return progress / s->size; +} + +//================================================================================================= +// Major methods: + +static bool sat_solver_lit_removable(sat_solver* s, lit l, int minl) +{ + lbool* tags = s->tags; + clause** reasons = s->reasons; + int* levels = s->levels; + int top = veci_size(&s->tagged); + + assert(lit_var(l) >= 0 && lit_var(l) < s->size); + assert(reasons[lit_var(l)] != 0); + veci_resize(&s->stack,0); + veci_push(&s->stack,lit_var(l)); + + while (veci_size(&s->stack) > 0){ + clause* c; + int v = veci_begin(&s->stack)[veci_size(&s->stack)-1]; + assert(v >= 0 && v < s->size); + veci_resize(&s->stack,veci_size(&s->stack)-1); + assert(reasons[v] != 0); + c = reasons[v]; + + if (clause_is_lit(c)){ + int v = lit_var(clause_read_lit(c)); + if (tags[v] == l_Undef && levels[v] != 0){ + if (reasons[v] != 0 && ((1 << (levels[v] & 31)) & minl)){ + veci_push(&s->stack,v); + tags[v] = l_True; + veci_push(&s->tagged,v); + }else{ + int* tagged = veci_begin(&s->tagged); + int j; + for (j = top; j < veci_size(&s->tagged); j++) + tags[tagged[j]] = l_Undef; + veci_resize(&s->tagged,top); + return false; + } + } + }else{ + lit* lits = clause_begin(c); + int i, j; + + for (i = 1; i < clause_size(c); i++){ + int v = lit_var(lits[i]); + if (tags[v] == l_Undef && levels[v] != 0){ + if (reasons[v] != 0 && ((1 << (levels[v] & 31)) & minl)){ + + veci_push(&s->stack,lit_var(lits[i])); + tags[v] = l_True; + veci_push(&s->tagged,v); + }else{ + int* tagged = veci_begin(&s->tagged); + for (j = top; j < veci_size(&s->tagged); j++) + tags[tagged[j]] = l_Undef; + veci_resize(&s->tagged,top); + return false; + } + } + } + } + } + + return true; +} + +static void sat_solver_analyze(sat_solver* s, clause* c, veci* learnt) +{ + lit* trail = s->trail; + lbool* tags = s->tags; + clause** reasons = s->reasons; + int* levels = s->levels; + int cnt = 0; + lit p = lit_Undef; + int ind = s->qtail-1; + lit* lits; + int i, j, minl; + int* tagged; + + veci_push(learnt,lit_Undef); + + do{ + assert(c != 0); + + if (clause_is_lit(c)){ + lit q = clause_read_lit(c); + assert(lit_var(q) >= 0 && lit_var(q) < s->size); + if (tags[lit_var(q)] == l_Undef && levels[lit_var(q)] > 0){ + tags[lit_var(q)] = l_True; + veci_push(&s->tagged,lit_var(q)); + act_var_bump(s,lit_var(q)); + if (levels[lit_var(q)] == sat_solver_dlevel(s)) + cnt++; + else + veci_push(learnt,q); + } + }else{ + + if (clause_learnt(c)) + act_clause_bump(s,c); + + lits = clause_begin(c); + //printlits(lits,lits+clause_size(c)); printf("\n"); + for (j = (p == lit_Undef ? 0 : 1); j < clause_size(c); j++){ + lit q = lits[j]; + assert(lit_var(q) >= 0 && lit_var(q) < s->size); + if (tags[lit_var(q)] == l_Undef && levels[lit_var(q)] > 0){ + tags[lit_var(q)] = l_True; + veci_push(&s->tagged,lit_var(q)); + act_var_bump(s,lit_var(q)); + if (levels[lit_var(q)] == sat_solver_dlevel(s)) + cnt++; + else + veci_push(learnt,q); + } + } + } + + while (tags[lit_var(trail[ind--])] == l_Undef); + + p = trail[ind+1]; + c = reasons[lit_var(p)]; + cnt--; + + }while (cnt > 0); + + *veci_begin(learnt) = lit_neg(p); + + lits = veci_begin(learnt); + minl = 0; + for (i = 1; i < veci_size(learnt); i++){ + int lev = levels[lit_var(lits[i])]; + minl |= 1 << (lev & 31); + } + + // simplify (full) + for (i = j = 1; i < veci_size(learnt); i++){ + if (reasons[lit_var(lits[i])] == 0 || !sat_solver_lit_removable(s,lits[i],minl)) + lits[j++] = lits[i]; + } + + // update size of learnt + statistics + s->stats.max_literals += veci_size(learnt); + veci_resize(learnt,j); + s->stats.tot_literals += j; + + // clear tags + tagged = veci_begin(&s->tagged); + for (i = 0; i < veci_size(&s->tagged); i++) + tags[tagged[i]] = l_Undef; + veci_resize(&s->tagged,0); + +#ifdef DEBUG + for (i = 0; i < s->size; i++) + assert(tags[i] == l_Undef); +#endif + +#ifdef VERBOSEDEBUG + printf(L_IND"Learnt {", L_ind); + for (i = 0; i < veci_size(learnt); i++) printf(" "L_LIT, L_lit(lits[i])); +#endif + if (veci_size(learnt) > 1){ + int max_i = 1; + int max = levels[lit_var(lits[1])]; + lit tmp; + + for (i = 2; i < veci_size(learnt); i++) + if (levels[lit_var(lits[i])] > max){ + max = levels[lit_var(lits[i])]; + max_i = i; + } + + tmp = lits[1]; + lits[1] = lits[max_i]; + lits[max_i] = tmp; + } +#ifdef VERBOSEDEBUG + { + int lev = veci_size(learnt) > 1 ? levels[lit_var(lits[1])] : 0; + printf(" } at level %d\n", lev); + } +#endif +} + + +clause* sat_solver_propagate(sat_solver* s) +{ + lbool* values = s->assigns; + clause* confl = (clause*)0; + lit* lits; + + //printf("sat_solver_propagate\n"); + while (confl == 0 && s->qtail - s->qhead > 0){ + lit p = s->trail[s->qhead++]; + vecp* ws = sat_solver_read_wlist(s,p); + clause **begin = (clause**)vecp_begin(ws); + clause **end = begin + vecp_size(ws); + clause **i, **j; + + s->stats.propagations++; + s->simpdb_props--; + + //printf("checking lit %d: "L_LIT"\n", veci_size(ws), L_lit(p)); + for (i = j = begin; i < end; ){ + if (clause_is_lit(*i)){ +// s->stats.inspects2++; + *j++ = *i; + if (!enqueue(s,clause_read_lit(*i),clause_from_lit(p))){ + confl = s->binary; + (clause_begin(confl))[1] = lit_neg(p); + (clause_begin(confl))[0] = clause_read_lit(*i++); + // Copy the remaining watches: +// s->stats.inspects2 += end - i; + while (i < end) + *j++ = *i++; + } + }else{ + lit false_lit; + lbool sig; + + lits = clause_begin(*i); + + // Make sure the false literal is data[1]: + false_lit = lit_neg(p); + if (lits[0] == false_lit){ + lits[0] = lits[1]; + lits[1] = false_lit; + } + assert(lits[1] == false_lit); + //printf("checking clause: "); printlits(lits, lits+clause_size(*i)); printf("\n"); + + // If 0th watch is true, then clause is already satisfied. + sig = !lit_sign(lits[0]); sig += sig - 1; + if (values[lit_var(lits[0])] == sig){ + *j++ = *i; + }else{ + // Look for new watch: + lit* stop = lits + clause_size(*i); + lit* k; + for (k = lits + 2; k < stop; k++){ + lbool sig = lit_sign(*k); sig += sig - 1; + if (values[lit_var(*k)] != sig){ + lits[1] = *k; + *k = false_lit; + vecp_push(sat_solver_read_wlist(s,lit_neg(lits[1])),*i); + goto next; } + } + + *j++ = *i; + // Clause is unit under assignment: + if (!enqueue(s,lits[0], *i)){ + confl = *i++; + // Copy the remaining watches: +// s->stats.inspects2 += end - i; + while (i < end) + *j++ = *i++; + } + } + } + next: + i++; + } + + s->stats.inspects += j - (clause**)vecp_begin(ws); + vecp_resize(ws,j - (clause**)vecp_begin(ws)); + } + + return confl; +} + +static inline int clause_cmp (const void* x, const void* y) { + return clause_size((clause*)x) > 2 && (clause_size((clause*)y) == 2 || clause_activity((clause*)x) < clause_activity((clause*)y)) ? -1 : 1; } + +void sat_solver_reducedb(sat_solver* s) +{ + int i, j; + double extra_lim = s->cla_inc / vecp_size(&s->learnts); // Remove any clause below this activity + clause** learnts = (clause**)vecp_begin(&s->learnts); + clause** reasons = s->reasons; + + sat_solver_sort(vecp_begin(&s->learnts), vecp_size(&s->learnts), &clause_cmp); + + for (i = j = 0; i < vecp_size(&s->learnts) / 2; i++){ + if (clause_size(learnts[i]) > 2 && reasons[lit_var(*clause_begin(learnts[i]))] != learnts[i]) + clause_remove(s,learnts[i]); + else + learnts[j++] = learnts[i]; + } + for (; i < vecp_size(&s->learnts); i++){ + if (clause_size(learnts[i]) > 2 && reasons[lit_var(*clause_begin(learnts[i]))] != learnts[i] && clause_activity(learnts[i]) < extra_lim) + clause_remove(s,learnts[i]); + else + learnts[j++] = learnts[i]; + } + + //printf("reducedb deleted %d\n", vecp_size(&s->learnts) - j); + + + vecp_resize(&s->learnts,j); +} + +static lbool sat_solver_search(sat_solver* s, sint64 nof_conflicts, sint64 nof_learnts) +{ + int* levels = s->levels; + double var_decay = 0.95; + double clause_decay = 0.999; + double random_var_freq = 0.02; + + sint64 conflictC = 0; + veci learnt_clause; + int i; + + assert(s->root_level == sat_solver_dlevel(s)); + + s->nRestarts++; + s->stats.starts++; + s->var_decay = (float)(1 / var_decay ); + s->cla_decay = (float)(1 / clause_decay); + veci_resize(&s->model,0); + veci_new(&learnt_clause); + + // use activity factors in every even restart + if ( (s->nRestarts & 1) && veci_size(&s->act_vars) > 0 ) + for ( i = 0; i < s->act_vars.size; i++ ) + act_var_bump_factor(s, s->act_vars.ptr[i]); + + for (;;){ + clause* confl = sat_solver_propagate(s); + if (confl != 0){ + // CONFLICT + int blevel; + +#ifdef VERBOSEDEBUG + printf(L_IND"**CONFLICT**\n", L_ind); +#endif + s->stats.conflicts++; conflictC++; + if (sat_solver_dlevel(s) == s->root_level){ + veci_delete(&learnt_clause); + return l_False; + } + + veci_resize(&learnt_clause,0); + sat_solver_analyze(s, confl, &learnt_clause); + blevel = veci_size(&learnt_clause) > 1 ? levels[lit_var(veci_begin(&learnt_clause)[1])] : s->root_level; + blevel = s->root_level > blevel ? s->root_level : blevel; + sat_solver_canceluntil(s,blevel); + sat_solver_record(s,&learnt_clause); + act_var_decay(s); + act_clause_decay(s); + + }else{ + // NO CONFLICT + int next; + + if (nof_conflicts >= 0 && conflictC >= nof_conflicts){ + // Reached bound on number of conflicts: + s->progress_estimate = sat_solver_progress(s); + sat_solver_canceluntil(s,s->root_level); + veci_delete(&learnt_clause); + return l_Undef; } + + if ( (s->nConfLimit && s->stats.conflicts > s->nConfLimit) || + (s->nInsLimit && s->stats.inspects > s->nInsLimit) ) + { + // Reached bound on number of conflicts: + s->progress_estimate = sat_solver_progress(s); + sat_solver_canceluntil(s,s->root_level); + veci_delete(&learnt_clause); + return l_Undef; + } + + if (sat_solver_dlevel(s) == 0 && !s->fSkipSimplify) + // Simplify the set of problem clauses: + sat_solver_simplify(s); + + if (nof_learnts >= 0 && vecp_size(&s->learnts) - s->qtail >= nof_learnts) + // Reduce the set of learnt clauses: + sat_solver_reducedb(s); + + // New variable decision: + s->stats.decisions++; + next = order_select(s,(float)random_var_freq); + + if (next == var_Undef){ + // Model found: + lbool* values = s->assigns; + int i; + veci_resize(&s->model, 0); + for (i = 0; i < s->size; i++) + veci_push(&s->model,(int)values[i]); + sat_solver_canceluntil(s,s->root_level); + veci_delete(&learnt_clause); + + /* + veci apa; veci_new(&apa); + for (i = 0; i < s->size; i++) + veci_push(&apa,(int)(s->model.ptr[i] == l_True ? toLit(i) : lit_neg(toLit(i)))); + printf("model: "); printlits((lit*)apa.ptr, (lit*)apa.ptr + veci_size(&apa)); printf("\n"); + veci_delete(&apa); + */ + + return l_True; + } + + assume(s,lit_neg(toLit(next))); + } + } + + return l_Undef; // cannot happen +} + +//================================================================================================= +// External solver functions: + +sat_solver* sat_solver_new(void) +{ + sat_solver* s = (sat_solver*)malloc(sizeof(sat_solver)); + memset( s, 0, sizeof(sat_solver) ); + + // initialize vectors + vecp_new(&s->clauses); + vecp_new(&s->learnts); + veci_new(&s->order); + veci_new(&s->trail_lim); + veci_new(&s->tagged); + veci_new(&s->stack); + veci_new(&s->model); + veci_new(&s->act_vars); + + // initialize arrays + s->wlists = 0; + s->activity = 0; + s->factors = 0; + s->assigns = 0; + s->orderpos = 0; + s->reasons = 0; + s->levels = 0; + s->tags = 0; + s->trail = 0; + + + // initialize other vars + s->size = 0; + s->cap = 0; + s->qhead = 0; + s->qtail = 0; + s->cla_inc = 1; + s->cla_decay = 1; + s->var_inc = 1; + s->var_decay = 1; + s->root_level = 0; + s->simpdb_assigns = 0; + s->simpdb_props = 0; + s->random_seed = 91648253; + s->progress_estimate = 0; + s->binary = (clause*)malloc(sizeof(clause) + sizeof(lit)*2); + s->binary->size_learnt = (2 << 1); + s->verbosity = 0; + + s->stats.starts = 0; + s->stats.decisions = 0; + s->stats.propagations = 0; + s->stats.inspects = 0; + s->stats.conflicts = 0; + s->stats.clauses = 0; + s->stats.clauses_literals = 0; + s->stats.learnts = 0; + s->stats.learnts_literals = 0; + s->stats.max_literals = 0; + s->stats.tot_literals = 0; + +#ifdef SAT_USE_SYSTEM_MEMORY_MANAGEMENT + s->pMem = NULL; +#else + s->pMem = Sat_MmStepStart( 10 ); +#endif + return s; +} + + +void sat_solver_delete(sat_solver* s) +{ + +#ifdef SAT_USE_SYSTEM_MEMORY_MANAGEMENT + int i; + for (i = 0; i < vecp_size(&s->clauses); i++) + free(vecp_begin(&s->clauses)[i]); + for (i = 0; i < vecp_size(&s->learnts); i++) + free(vecp_begin(&s->learnts)[i]); +#else + Sat_MmStepStop( s->pMem, 0 ); +#endif + + // delete vectors + vecp_delete(&s->clauses); + vecp_delete(&s->learnts); + veci_delete(&s->order); + veci_delete(&s->trail_lim); + veci_delete(&s->tagged); + veci_delete(&s->stack); + veci_delete(&s->model); + veci_delete(&s->act_vars); + free(s->binary); + + // delete arrays + if (s->wlists != 0){ + int i; + for (i = 0; i < s->size*2; i++) + vecp_delete(&s->wlists[i]); + + // if one is different from null, all are + free(s->wlists ); + free(s->activity ); + free(s->factors ); + free(s->assigns ); + free(s->orderpos ); + free(s->reasons ); + free(s->levels ); + free(s->trail ); + free(s->tags ); + } + + sat_solver_store_free(s); + free(s); +} + + +bool sat_solver_addclause(sat_solver* s, lit* begin, lit* end) +{ + lit *i,*j; + int maxvar; + lbool* values; + lit last; + + if (begin == end) return false; + + //printlits(begin,end); printf("\n"); + // insertion sort + maxvar = lit_var(*begin); + for (i = begin + 1; i < end; i++){ + lit l = *i; + maxvar = lit_var(l) > maxvar ? lit_var(l) : maxvar; + for (j = i; j > begin && *(j-1) > l; j--) + *j = *(j-1); + *j = l; + } + sat_solver_setnvars(s,maxvar+1); +// sat_solver_setnvars(s, lit_var(*(end-1))+1 ); + + //printlits(begin,end); printf("\n"); + values = s->assigns; + + // delete duplicates + last = lit_Undef; + for (i = j = begin; i < end; i++){ + //printf("lit: "L_LIT", value = %d\n", L_lit(*i), (lit_sign(*i) ? -values[lit_var(*i)] : values[lit_var(*i)])); + lbool sig = !lit_sign(*i); sig += sig - 1; + if (*i == lit_neg(last) || sig == values[lit_var(*i)]) + return true; // tautology + else if (*i != last && values[lit_var(*i)] == l_Undef) + last = *j++ = *i; + } + + //printf("final: "); printlits(begin,j); printf("\n"); + + if (j == begin) // empty clause + return false; + + /////////////////////////////////// + // add clause to internal storage + if ( s->pStore ) + { + extern int Sto_ManAddClause( void * p, lit * pBeg, lit * pEnd ); + int RetValue = Sto_ManAddClause( s->pStore, begin, j ); + assert( RetValue ); + } + /////////////////////////////////// + + if (j - begin == 1) // unit clause + return enqueue(s,*begin,(clause*)0); + + // create new clause + vecp_push(&s->clauses,clause_new(s,begin,j,0)); + + + s->stats.clauses++; + s->stats.clauses_literals += j - begin; + + return true; +} + + +bool sat_solver_simplify(sat_solver* s) +{ + clause** reasons; + int type; + + assert(sat_solver_dlevel(s) == 0); + + if (sat_solver_propagate(s) != 0) + return false; + + if (s->qhead == s->simpdb_assigns || s->simpdb_props > 0) + return true; + + reasons = s->reasons; + for (type = 0; type < 2; type++){ + vecp* cs = type ? &s->learnts : &s->clauses; + clause** cls = (clause**)vecp_begin(cs); + + int i, j; + for (j = i = 0; i < vecp_size(cs); i++){ + if (reasons[lit_var(*clause_begin(cls[i]))] != cls[i] && + clause_simplify(s,cls[i]) == l_True) + clause_remove(s,cls[i]); + else + cls[j++] = cls[i]; + } + vecp_resize(cs,j); + } + + s->simpdb_assigns = s->qhead; + // (shouldn't depend on 'stats' really, but it will do for now) + s->simpdb_props = (int)(s->stats.clauses_literals + s->stats.learnts_literals); + + return true; +} + + +int sat_solver_solve(sat_solver* s, lit* begin, lit* end, sint64 nConfLimit, sint64 nInsLimit, sint64 nConfLimitGlobal, sint64 nInsLimitGlobal) +{ + sint64 nof_conflicts = 100; + sint64 nof_learnts = sat_solver_nclauses(s) / 3; + lbool status = l_Undef; + lbool* values = s->assigns; + lit* i; + + // set the external limits + s->nCalls++; + s->nRestarts = 0; + s->nConfLimit = 0; + s->nInsLimit = 0; + if ( nConfLimit ) + s->nConfLimit = s->stats.conflicts + nConfLimit; + if ( nInsLimit ) + s->nInsLimit = s->stats.inspects + nInsLimit; + if ( nConfLimitGlobal && (s->nConfLimit == 0 || s->nConfLimit > nConfLimitGlobal) ) + s->nConfLimit = nConfLimitGlobal; + if ( nInsLimitGlobal && (s->nInsLimit == 0 || s->nInsLimit > nInsLimitGlobal) ) + s->nInsLimit = nInsLimitGlobal; + + //printf("solve: "); printlits(begin, end); printf("\n"); + for (i = begin; i < end; i++){ + switch (lit_sign(*i) ? -values[lit_var(*i)] : values[lit_var(*i)]){ + case 1: /* l_True: */ + break; + case 0: /* l_Undef */ + assume(s, *i); + if (sat_solver_propagate(s) == NULL) + break; + // fallthrough + case -1: /* l_False */ + sat_solver_canceluntil(s, 0); + return l_False; + } + } + s->nCalls2++; + + s->root_level = sat_solver_dlevel(s); + + if (s->verbosity >= 1){ + printf("==================================[MINISAT]===================================\n"); + printf("| Conflicts | ORIGINAL | LEARNT | Progress |\n"); + printf("| | Clauses Literals | Limit Clauses Literals Lit/Cl | |\n"); + printf("==============================================================================\n"); + } + + while (status == l_Undef){ + double Ratio = (s->stats.learnts == 0)? 0.0 : + s->stats.learnts_literals / (double)s->stats.learnts; + + if (s->verbosity >= 1) + { + printf("| %9.0f | %7.0f %8.0f | %7.0f %7.0f %8.0f %7.1f | %6.3f %% |\n", + (double)s->stats.conflicts, + (double)s->stats.clauses, + (double)s->stats.clauses_literals, + (double)nof_learnts, + (double)s->stats.learnts, + (double)s->stats.learnts_literals, + Ratio, + s->progress_estimate*100); + fflush(stdout); + } + status = sat_solver_search(s, nof_conflicts, nof_learnts); + nof_conflicts = nof_conflicts * 3 / 2; //*= 1.5; + nof_learnts = nof_learnts * 11 / 10; //*= 1.1; + + // quit the loop if reached an external limit + if ( s->nConfLimit && s->stats.conflicts > s->nConfLimit ) + { +// printf( "Reached the limit on the number of conflicts (%d).\n", s->nConfLimit ); + break; + } + if ( s->nInsLimit && s->stats.inspects > s->nInsLimit ) + { +// printf( "Reached the limit on the number of implications (%d).\n", s->nInsLimit ); + break; + } + } + if (s->verbosity >= 1) + printf("==============================================================================\n"); + + sat_solver_canceluntil(s,0); + + //////////////////////////////////////////////// + if ( status == l_False && s->pStore ) + { + extern int Sto_ManAddClause( void * p, lit * pBeg, lit * pEnd ); + int RetValue = Sto_ManAddClause( s->pStore, NULL, NULL ); + assert( RetValue ); + } + //////////////////////////////////////////////// + return status; +} + + +int sat_solver_nvars(sat_solver* s) +{ + return s->size; +} + + +int sat_solver_nclauses(sat_solver* s) +{ + return vecp_size(&s->clauses); +} + + +int sat_solver_nconflicts(sat_solver* s) +{ + return (int)s->stats.conflicts; +} + +//================================================================================================= +// Clause storage functions: + +void sat_solver_store_alloc( sat_solver * s ) +{ + extern void * Sto_ManAlloc(); + assert( s->pStore == NULL ); + s->pStore = Sto_ManAlloc(); +} + +void sat_solver_store_write( sat_solver * s, char * pFileName ) +{ + extern void Sto_ManDumpClauses( void * p, char * pFileName ); + if ( s->pStore ) Sto_ManDumpClauses( s->pStore, pFileName ); +} + +void sat_solver_store_free( sat_solver * s ) +{ + extern void Sto_ManFree( void * p ); + if ( s->pStore ) Sto_ManFree( s->pStore ); + s->pStore = NULL; +} + +void sat_solver_store_mark_roots( sat_solver * s ) +{ + extern void Sto_ManMarkRoots( void * p ); + if ( s->pStore ) Sto_ManMarkRoots( s->pStore ); +} + +void sat_solver_store_mark_clauses_a( sat_solver * s ) +{ + extern void Sto_ManMarkClausesA( void * p ); + if ( s->pStore ) Sto_ManMarkClausesA( s->pStore ); +} + +void * sat_solver_store_release( sat_solver * s ) +{ + void * pTemp; + if ( s->pStore == NULL ) + return NULL; + pTemp = s->pStore; + s->pStore = NULL; + return pTemp; +} + +//================================================================================================= +// Sorting functions (sigh): + +static inline void selectionsort(void** array, int size, int(*comp)(const void *, const void *)) +{ + int i, j, best_i; + void* tmp; + + for (i = 0; i < size-1; i++){ + best_i = i; + for (j = i+1; j < size; j++){ + if (comp(array[j], array[best_i]) < 0) + best_i = j; + } + tmp = array[i]; array[i] = array[best_i]; array[best_i] = tmp; + } +} + + +static void sortrnd(void** array, int size, int(*comp)(const void *, const void *), double* seed) +{ + if (size <= 15) + selectionsort(array, size, comp); + + else{ + void* pivot = array[irand(seed, size)]; + void* tmp; + int i = -1; + int j = size; + + for(;;){ + do i++; while(comp(array[i], pivot)<0); + do j--; while(comp(pivot, array[j])<0); + + if (i >= j) break; + + tmp = array[i]; array[i] = array[j]; array[j] = tmp; + } + + sortrnd(array , i , comp, seed); + sortrnd(&array[i], size-i, comp, seed); + } +} + +void sat_solver_sort(void** array, int size, int(*comp)(const void *, const void *)) +{ + double seed = 91648253; + sortrnd(array,size,comp,&seed); +} diff --git a/src/sat/bsat/satSolver.h b/src/sat/bsat/satSolver.h new file mode 100644 index 00000000..542b9895 --- /dev/null +++ b/src/sat/bsat/satSolver.h @@ -0,0 +1,191 @@ +/************************************************************************************************** +MiniSat -- Copyright (c) 2005, Niklas Sorensson +http://www.cs.chalmers.se/Cs/Research/FormalMethods/MiniSat/ + +Permission is hereby granted, free of charge, to any person obtaining a copy of this software and +associated documentation files (the "Software"), to deal in the Software without restriction, +including without limitation the rights to use, copy, modify, merge, publish, distribute, +sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all copies or +substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT +NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT +OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +**************************************************************************************************/ +// Modified to compile with MS Visual Studio 6.0 by Alan Mishchenko + +#ifndef satSolver_h +#define satSolver_h + +#ifdef _WIN32 +#define inline __inline // compatible with MS VS 6.0 +#endif + +#include "satVec.h" +#include "satMem.h" + +//================================================================================================= +// Simple types: + +// does not work for c++ +//typedef int bool; +#ifndef __cplusplus +#ifndef bool +#define bool int +#endif +#endif + +static const bool true = 1; +static const bool false = 0; + +typedef int lit; +typedef char lbool; + +#ifndef SINT64 +#define SINT64 + +#ifdef _WIN32 +typedef signed __int64 sint64; // compatible with MS VS 6.0 +#else +typedef long long sint64; +#endif + +#endif + +static const int var_Undef = -1; +static const lit lit_Undef = -2; + +static const lbool l_Undef = 0; +static const lbool l_True = 1; +static const lbool l_False = -1; + +static inline lit toLit (int v) { return v + v; } +static inline lit toLitCond(int v, int c) { return v + v + (c != 0); } +static inline lit lit_neg (lit l) { return l ^ 1; } +static inline int lit_var (lit l) { return l >> 1; } +static inline int lit_sign (lit l) { return l & 1; } +static inline int lit_print(lit l) { return lit_sign(l)? -lit_var(l)-1 : lit_var(l)+1; } +static inline lit lit_read (int s) { return s > 0 ? toLit(s-1) : lit_neg(toLit(-s-1)); } + + +//================================================================================================= +// Public interface: + +struct sat_solver_t; +typedef struct sat_solver_t sat_solver; + +extern sat_solver* sat_solver_new(void); +extern void sat_solver_delete(sat_solver* s); + +extern bool sat_solver_addclause(sat_solver* s, lit* begin, lit* end); +extern bool sat_solver_simplify(sat_solver* s); +extern int sat_solver_solve(sat_solver* s, lit* begin, lit* end, sint64 nConfLimit, sint64 nInsLimit, sint64 nConfLimitGlobal, sint64 nInsLimitGlobal); + +extern int sat_solver_nvars(sat_solver* s); +extern int sat_solver_nclauses(sat_solver* s); +extern int sat_solver_nconflicts(sat_solver* s); + +extern void sat_solver_setnvars(sat_solver* s,int n); + +struct stats_t +{ + sint64 starts, decisions, propagations, inspects, conflicts; + sint64 clauses, clauses_literals, learnts, learnts_literals, max_literals, tot_literals; +}; +typedef struct stats_t stats; + +extern void Sat_SolverWriteDimacs( sat_solver * p, char * pFileName, lit* assumptionsBegin, lit* assumptionsEnd, int incrementVars ); +extern void Sat_SolverPrintStats( FILE * pFile, sat_solver * p ); +extern int * Sat_SolverGetModel( sat_solver * p, int * pVars, int nVars ); +extern void Sat_SolverDoubleClauses( sat_solver * p, int iVar ); + +// trace recording +extern void Sat_SolverTraceStart( sat_solver * pSat, char * pName ); +extern void Sat_SolverTraceStop( sat_solver * pSat ); +extern void Sat_SolverTraceWrite( sat_solver * pSat, int * pBeg, int * pEnd, int fRoot ); + +// clause storage +extern void sat_solver_store_alloc( sat_solver * s ); +extern void sat_solver_store_write( sat_solver * s, char * pFileName ); +extern void sat_solver_store_free( sat_solver * s ); +extern void sat_solver_store_mark_roots( sat_solver * s ); +extern void sat_solver_store_mark_clauses_a( sat_solver * s ); +extern void * sat_solver_store_release( sat_solver * s ); + +//================================================================================================= +// Solver representation: + +struct clause_t; +typedef struct clause_t clause; + +struct sat_solver_t +{ + int size; // nof variables + int cap; // size of varmaps + int qhead; // Head index of queue. + int qtail; // Tail index of queue. + + // clauses + vecp clauses; // List of problem constraints. (contains: clause*) + vecp learnts; // List of learnt clauses. (contains: clause*) + + // activities + double var_inc; // Amount to bump next variable with. + double var_decay; // INVERSE decay factor for variable activity: stores 1/decay. + float cla_inc; // Amount to bump next clause with. + float cla_decay; // INVERSE decay factor for clause activity: stores 1/decay. + + vecp* wlists; // + double* activity; // A heuristic measurement of the activity of a variable. + lbool* assigns; // Current values of variables. + int* orderpos; // Index in variable order. + clause** reasons; // + int* levels; // + lit* trail; + + clause* binary; // A temporary binary clause + lbool* tags; // + veci tagged; // (contains: var) + veci stack; // (contains: var) + + veci order; // Variable order. (heap) (contains: var) + veci trail_lim; // Separator indices for different decision levels in 'trail'. (contains: int) + veci model; // If problem is solved, this vector contains the model (contains: lbool). + + int root_level; // Level of first proper decision. + int simpdb_assigns;// Number of top-level assignments at last 'simplifyDB()'. + int simpdb_props; // Number of propagations before next 'simplifyDB()'. + double random_seed; + double progress_estimate; + int verbosity; // Verbosity level. 0=silent, 1=some progress report, 2=everything + + stats stats; + + sint64 nConfLimit; // external limit on the number of conflicts + sint64 nInsLimit; // external limit on the number of implications + + veci act_vars; // variables whose activity has changed + double* factors; // the activity factors + int nRestarts; // the number of local restarts + int nCalls; // the number of local restarts + int nCalls2; // the number of local restarts + + Sat_MmStep_t * pMem; + + int fSkipSimplify; // set to one to skip simplification of the clause database + + // clause store + void * pStore; + + // trace recording + FILE * pFile; + int nClauses; + int nRoots; +}; + +#endif diff --git a/src/sat/bsat/satStore.c b/src/sat/bsat/satStore.c new file mode 100644 index 00000000..f968162e --- /dev/null +++ b/src/sat/bsat/satStore.c @@ -0,0 +1,437 @@ +/**CFile**************************************************************** + + FileName [satStore.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [SAT solver.] + + Synopsis [Records the trace of SAT solving in the CNF form.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: satStore.c,v 1.4 2005/09/16 22:55:03 casem Exp $] + +***********************************************************************/ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> +#include <time.h> +#include "satStore.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Fetches memory.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Sto_ManMemoryFetch( Sto_Man_t * p, int nBytes ) +{ + char * pMem; + if ( p->pChunkLast == NULL || nBytes > p->nChunkSize - p->nChunkUsed ) + { + pMem = (char *)malloc( p->nChunkSize ); + *(char **)pMem = p->pChunkLast; + p->pChunkLast = pMem; + p->nChunkUsed = sizeof(char *); + } + pMem = p->pChunkLast + p->nChunkUsed; + p->nChunkUsed += nBytes; + return pMem; +} + +/**Function************************************************************* + + Synopsis [Frees memory manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sto_ManMemoryStop( Sto_Man_t * p ) +{ + char * pMem, * pNext; + if ( p->pChunkLast == NULL ) + return; + for ( pMem = p->pChunkLast; (pNext = *(char **)pMem); pMem = pNext ) + free( pMem ); + free( pMem ); +} + +/**Function************************************************************* + + Synopsis [Reports memory usage in bytes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Sto_ManMemoryReport( Sto_Man_t * p ) +{ + int Total; + char * pMem, * pNext; + if ( p->pChunkLast == NULL ) + return 0; + Total = p->nChunkUsed; + for ( pMem = p->pChunkLast; (pNext = *(char **)pMem); pMem = pNext ) + Total += p->nChunkSize; + return Total; +} + + +/**Function************************************************************* + + Synopsis [Allocate proof manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Sto_Man_t * Sto_ManAlloc() +{ + Sto_Man_t * p; + // allocate the manager + p = (Sto_Man_t *)malloc( sizeof(Sto_Man_t) ); + memset( p, 0, sizeof(Sto_Man_t) ); + // memory management + p->nChunkSize = (1<<16); // use 64K chunks + return p; +} + +/**Function************************************************************* + + Synopsis [Deallocate proof manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sto_ManFree( Sto_Man_t * p ) +{ + Sto_ManMemoryStop( p ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Adds one clause to the manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Sto_ManAddClause( Sto_Man_t * p, lit * pBeg, lit * pEnd ) +{ + Sto_Cls_t * pClause; + lit Lit, * i, * j; + int nSize; + + // process the literals + if ( pBeg < pEnd ) + { + // insertion sort + for ( i = pBeg + 1; i < pEnd; i++ ) + { + Lit = *i; + for ( j = i; j > pBeg && *(j-1) > Lit; j-- ) + *j = *(j-1); + *j = Lit; + } + // make sure there is no duplicated variables + for ( i = pBeg + 1; i < pEnd; i++ ) + if ( lit_var(*(i-1)) == lit_var(*i) ) + { + printf( "The clause contains two literals of the same variable: %d and %d.\n", *(i-1), *i ); + return 0; + } + // check the largest var size + p->nVars = STO_MAX( p->nVars, lit_var(*(pEnd-1)) + 1 ); + } + + // get memory for the clause + nSize = sizeof(Sto_Cls_t) + sizeof(lit) * (pEnd - pBeg); + pClause = (Sto_Cls_t *)Sto_ManMemoryFetch( p, nSize ); + memset( pClause, 0, sizeof(Sto_Cls_t) ); + + // assign the clause + pClause->Id = p->nClauses++; + pClause->nLits = pEnd - pBeg; + memcpy( pClause->pLits, pBeg, sizeof(lit) * (pEnd - pBeg) ); + + // add the clause to the list + if ( p->pHead == NULL ) + p->pHead = pClause; + if ( p->pTail == NULL ) + p->pTail = pClause; + else + { + p->pTail->pNext = pClause; + p->pTail = pClause; + } + + // add the empty clause + if ( pClause->nLits == 0 ) + { + if ( p->pEmpty ) + { + printf( "More than one empty clause!\n" ); + return 0; + } + p->pEmpty = pClause; + } + return 1; +} + +/**Function************************************************************* + + Synopsis [Mark all clauses added so far as root clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sto_ManMarkRoots( Sto_Man_t * p ) +{ + Sto_Cls_t * pClause; + p->nRoots = 0; + Sto_ManForEachClause( p, pClause ) + { + pClause->fRoot = 1; + p->nRoots++; + } +} + +/**Function************************************************************* + + Synopsis [Mark all clauses added so far as clause of A.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sto_ManMarkClausesA( Sto_Man_t * p ) +{ + Sto_Cls_t * pClause; + p->nClausesA = 0; + Sto_ManForEachClause( p, pClause ) + { + pClause->fA = 1; + p->nClausesA++; + } +} + + +/**Function************************************************************* + + Synopsis [Writes the stored clauses into a file.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sto_ManDumpClauses( Sto_Man_t * p, char * pFileName ) +{ + FILE * pFile; + Sto_Cls_t * pClause; + int i; + // start the file + pFile = fopen( pFileName, "w" ); + if ( pFile == NULL ) + { + printf( "Error: Cannot open output file (%s).\n", pFileName ); + return; + } + // write the data + fprintf( pFile, "p %d %d %d %d\n", p->nVars, p->nClauses, p->nRoots, p->nClausesA ); + Sto_ManForEachClause( p, pClause ) + { + for ( i = 0; i < (int)pClause->nLits; i++ ) + fprintf( pFile, " %d", lit_print(pClause->pLits[i]) ); + fprintf( pFile, "\n" ); + } + fprintf( pFile, " 0\n" ); + fclose( pFile ); +} + +/**Function************************************************************* + + Synopsis [Reads one literal from file.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Sto_ManLoadNumber( FILE * pFile, int * pNumber ) +{ + int Char, Number = 0, Sign = 0; + // skip space-like chars + do { + Char = fgetc( pFile ); + if ( Char == EOF ) + return 0; + } while ( Char == ' ' || Char == '\t' || Char == '\r' || Char == '\n' ); + // read the literal + while ( 1 ) + { + // get the next character + Char = fgetc( pFile ); + if ( Char == ' ' || Char == '\t' || Char == '\r' || Char == '\n' ) + break; + // check that the char is a digit + if ( (Char < '0' || Char > '9') && Char != '-' ) + { + printf( "Error: Wrong char (%c) in the input file.\n", Char ); + return 0; + } + // check if this is a minus + if ( Char == '-' ) + Sign = 1; + else + Number = 10 * Number + Char; + } + // return the number + *pNumber = Sign? -Number : Number; + return 1; +} + +/**Function************************************************************* + + Synopsis [Reads CNF from file.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Sto_Man_t * Sto_ManLoadClauses( char * pFileName ) +{ + FILE * pFile; + Sto_Man_t * p; + Sto_Cls_t * pClause; + char pBuffer[1024]; + int nLits, nLitsAlloc, Counter, Number; + lit * pLits; + + // start the file + pFile = fopen( pFileName, "r" ); + if ( pFile == NULL ) + { + printf( "Error: Cannot open input file (%s).\n", pFileName ); + return NULL; + } + + // create the manager + p = Sto_ManAlloc(); + + // alloc the array of literals + nLitsAlloc = 1024; + pLits = (lit *)malloc( sizeof(lit) * nLitsAlloc ); + + // read file header + p->nVars = p->nClauses = p->nRoots = p->nClausesA = 0; + while ( fgets( pBuffer, 1024, pFile ) ) + { + if ( pBuffer[0] == 'c' ) + continue; + if ( pBuffer[0] == 'p' ) + { + sscanf( pBuffer + 1, "%d %d %d %d", &p->nVars, &p->nClauses, &p->nRoots, &p->nClausesA ); + break; + } + printf( "Warning: Skipping line: \"%s\"\n", pBuffer ); + } + + // read the clauses + nLits = 0; + while ( Sto_ManLoadNumber(pFile, &Number) ) + { + if ( Number == 0 ) + { + int RetValue; + RetValue = Sto_ManAddClause( p, pLits, pLits + nLits ); + assert( RetValue ); + nLits = 0; + continue; + } + if ( nLits == nLitsAlloc ) + { + nLitsAlloc *= 2; + pLits = (lit *)realloc( pLits, sizeof(lit) * nLitsAlloc ); + } + pLits[ nLits++ ] = lit_read(Number); + } + if ( nLits > 0 ) + printf( "Error: The last clause was not saved.\n" ); + + // count clauses + Counter = 0; + Sto_ManForEachClause( p, pClause ) + Counter++; + + // check the number of clauses + if ( p->nClauses != Counter ) + { + printf( "Error: The actual number of clauses (%d) is different than declared (%d).\n", Counter, p->nClauses ); + Sto_ManFree( p ); + return NULL; + } + + free( pLits ); + fclose( pFile ); + return p; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/bsat/satStore.h b/src/sat/bsat/satStore.h new file mode 100644 index 00000000..346b59df --- /dev/null +++ b/src/sat/bsat/satStore.h @@ -0,0 +1,137 @@ +/**CFile**************************************************************** + + FileName [pr.h] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [Proof recording.] + + Synopsis [External declarations.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: pr.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#ifndef __PR_H__ +#define __PR_H__ + +/* + The trace of SAT solving contains the original clause of the problem + along with the learned clauses derived during SAT solving. + The first line of the resulting file contains 3 numbers instead of 2: + c <num_vars> <num_all_clauses> <num_root_clauses> +*/ + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef _WIN32 +#define inline __inline // compatible with MS VS 6.0 +#endif + +#ifndef PRT +#define PRT(a,t) printf("%s = ", (a)); printf("%6.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC)) +#endif + +#define STO_MAX(a,b) ((a) > (b) ? (a) : (b)) + +//////////////////////////////////////////////////////////////////////// +/// INCLUDES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// PARAMETERS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// BASIC TYPES /// +//////////////////////////////////////////////////////////////////////// + +typedef unsigned lit; + +typedef struct Sto_Cls_t_ Sto_Cls_t; +struct Sto_Cls_t_ +{ + Sto_Cls_t * pNext; // the next clause + Sto_Cls_t * pNext0; // the next 0-watch + Sto_Cls_t * pNext1; // the next 0-watch + int Id; // the clause ID + unsigned fA : 1; // belongs to A + unsigned fRoot : 1; // original clause + unsigned fVisit : 1; // visited clause + unsigned nLits : 24; // the number of literals + lit pLits[0]; // literals of this clause +}; + +typedef struct Sto_Man_t_ Sto_Man_t; +struct Sto_Man_t_ +{ + // general data + int nVars; // the number of variables + int nRoots; // the number of root clauses + int nClauses; // the number of all clauses + int nClausesA; // the number of clauses of A + Sto_Cls_t * pHead; // the head clause + Sto_Cls_t * pTail; // the tail clause + Sto_Cls_t * pEmpty; // the empty clause + // memory management + int nChunkSize; // the number of bytes in a chunk + int nChunkUsed; // the number of bytes used in the last chunk + char * pChunkLast; // the last memory chunk +}; + +// variable/literal conversions (taken from MiniSat) +static inline lit toLit (int v) { return v + v; } +static inline lit toLitCond(int v, int c) { return v + v + (c != 0); } +static inline lit lit_neg (lit l) { return l ^ 1; } +static inline int lit_var (lit l) { return l >> 1; } +static inline int lit_sign (lit l) { return l & 1; } +static inline int lit_print(lit l) { return lit_sign(l)? -lit_var(l)-1 : lit_var(l)+1; } +static inline lit lit_read (int s) { return s > 0 ? toLit(s-1) : lit_neg(toLit(-s-1)); } +static inline int lit_check(lit l, int n) { return l >= 0 && lit_var(l) < n; } + +// iterators through the clauses +#define Sto_ManForEachClause( p, pCls ) for( pCls = p->pHead; pCls; pCls = pCls->pNext ) +#define Sto_ManForEachClauseRoot( p, pCls ) for( pCls = p->pHead; pCls && pCls->fRoot; pCls = pCls->pNext ) + +//////////////////////////////////////////////////////////////////////// +/// MACRO DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +/*=== satStore.c ==========================================================*/ +extern Sto_Man_t * Sto_ManAlloc(); +extern void Sto_ManFree( Sto_Man_t * p ); +extern int Sto_ManAddClause( Sto_Man_t * p, lit * pBeg, lit * pEnd ); +extern int Sto_ManMemoryReport( Sto_Man_t * p ); +extern void Sto_ManMarkRoots( Sto_Man_t * p ); +extern void Sto_ManMarkClausesA( Sto_Man_t * p ); +extern void Sto_ManDumpClauses( Sto_Man_t * p, char * pFileName ); +extern Sto_Man_t * Sto_ManLoadClauses( char * pFileName ); + +/*=== satInter.c ==========================================================*/ +typedef struct Int_Man_t_ Int_Man_t; +extern Int_Man_t * Int_ManAlloc( int nVarsAlloc ); +extern void Int_ManFree( Int_Man_t * p ); +extern int Int_ManInterpolate( Int_Man_t * p, Sto_Man_t * pCnf, int fVerbose, unsigned ** ppResult ); + +#ifdef __cplusplus +} +#endif + +#endif + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + diff --git a/src/sat/bsat/satTrace.c b/src/sat/bsat/satTrace.c new file mode 100644 index 00000000..111e8dfb --- /dev/null +++ b/src/sat/bsat/satTrace.c @@ -0,0 +1,109 @@ +/**CFile**************************************************************** + + FileName [satTrace.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [SAT sat_solver.] + + Synopsis [Records the trace of SAT solving in the CNF form.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: satTrace.c,v 1.4 2005/09/16 22:55:03 casem Exp $] + +***********************************************************************/ + +#include <stdio.h> +#include <assert.h> +#include "satSolver.h" + +/* + The trace of SAT solving contains the original clause of the problem + along with the learned clauses derived during SAT solving. + The first line of the resulting file contains 3 numbers instead of 2: + c <num_vars> <num_all_clauses> <num_root_clauses> +*/ + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Start the trace recording.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_SolverTraceStart( sat_solver * pSat, char * pName ) +{ + assert( pSat->pFile == NULL ); + pSat->pFile = fopen( pName, "w" ); + fprintf( pSat->pFile, " \n" ); + pSat->nClauses = 0; + pSat->nRoots = 0; +} + +/**Function************************************************************* + + Synopsis [Stops the trace recording.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_SolverTraceStop( sat_solver * pSat ) +{ + if ( pSat->pFile == NULL ) + return; + rewind( pSat->pFile ); + fprintf( pSat->pFile, "p %d %d %d", sat_solver_nvars(pSat), pSat->nClauses, pSat->nRoots ); + fclose( pSat->pFile ); + pSat->pFile = NULL; +} + + +/**Function************************************************************* + + Synopsis [Writes one clause into the trace file.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_SolverTraceWrite( sat_solver * pSat, int * pBeg, int * pEnd, int fRoot ) +{ + if ( pSat->pFile == NULL ) + return; + pSat->nClauses++; + pSat->nRoots += fRoot; + for ( ; pBeg < pEnd ; pBeg++ ) + fprintf( pSat->pFile, " %d", lit_print(*pBeg) ); + fprintf( pSat->pFile, " 0\n" ); +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/bsat/satUtil.c b/src/sat/bsat/satUtil.c new file mode 100644 index 00000000..3961cf7e --- /dev/null +++ b/src/sat/bsat/satUtil.c @@ -0,0 +1,234 @@ +/**CFile**************************************************************** + + FileName [satUtil.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [C-language MiniSat solver.] + + Synopsis [Additional SAT solver procedures.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: satUtil.c,v 1.4 2005/09/16 22:55:03 casem Exp $] + +***********************************************************************/ + +#include <stdio.h> +#include <assert.h> +#include "satSolver.h" +#include "vec.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +struct clause_t +{ + int size_learnt; + lit lits[0]; +}; + +static inline int clause_size( clause* c ) { return c->size_learnt >> 1; } +static inline lit* clause_begin( clause* c ) { return c->lits; } + +static void Sat_SolverClauseWriteDimacs( FILE * pFile, clause * pC, bool fIncrement ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Write the clauses in the solver into a file in DIMACS format.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_SolverWriteDimacs( sat_solver * p, char * pFileName, lit* assumptionsBegin, lit* assumptionsEnd, int incrementVars ) +{ + FILE * pFile; + void ** pClauses; + int nClauses, i; + + // count the number of clauses + nClauses = p->clauses.size + p->learnts.size; + for ( i = 0; i < p->size; i++ ) + if ( p->levels[i] == 0 && p->assigns[i] != l_Undef ) + nClauses++; + + // start the file + pFile = fopen( pFileName, "wb" ); + if ( pFile == NULL ) + { + printf( "Sat_SolverWriteDimacs(): Cannot open the ouput file.\n" ); + return; + } +// fprintf( pFile, "c CNF generated by ABC on %s\n", Extra_TimeStamp() ); + fprintf( pFile, "p cnf %d %d\n", p->size, nClauses ); + + // write the original clauses + nClauses = p->clauses.size; + pClauses = p->clauses.ptr; + for ( i = 0; i < nClauses; i++ ) + Sat_SolverClauseWriteDimacs( pFile, pClauses[i], incrementVars ); + + // write the learned clauses + nClauses = p->learnts.size; + pClauses = p->learnts.ptr; + for ( i = 0; i < nClauses; i++ ) + Sat_SolverClauseWriteDimacs( pFile, pClauses[i], incrementVars ); + + // write zero-level assertions + for ( i = 0; i < p->size; i++ ) + if ( p->levels[i] == 0 && p->assigns[i] != l_Undef ) + fprintf( pFile, "%s%d%s\n", + (p->assigns[i] == l_False)? "-": "", + i + (int)(incrementVars>0), + (incrementVars) ? " 0" : ""); + + // write the assumptions + if (assumptionsBegin) { + for (; assumptionsBegin != assumptionsEnd; assumptionsBegin++) { + fprintf( pFile, "%s%d%s\n", + lit_sign(*assumptionsBegin)? "-": "", + lit_var(*assumptionsBegin) + (int)(incrementVars>0), + (incrementVars) ? " 0" : ""); + } + } + + fprintf( pFile, "\n" ); + fclose( pFile ); +} + +/**Function************************************************************* + + Synopsis [Writes the given clause in a file in DIMACS format.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_SolverClauseWriteDimacs( FILE * pFile, clause * pC, bool fIncrement ) +{ + lit * pLits = clause_begin(pC); + int nLits = clause_size(pC); + int i; + + for ( i = 0; i < nLits; i++ ) + fprintf( pFile, "%s%d ", (lit_sign(pLits[i])? "-": ""), lit_var(pLits[i]) + (int)(fIncrement>0) ); + if ( fIncrement ) + fprintf( pFile, "0" ); + fprintf( pFile, "\n" ); +} + +/**Function************************************************************* + + Synopsis [Writes the given clause in a file in DIMACS format.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_SolverPrintStats( FILE * pFile, sat_solver * p ) +{ +// printf( "calls : %8d (%d)\n", (int)p->nCalls, (int)p->nCalls2 ); + printf( "starts : %8d\n", (int)p->stats.starts ); + printf( "conflicts : %8d\n", (int)p->stats.conflicts ); + printf( "decisions : %8d\n", (int)p->stats.decisions ); + printf( "propagations : %8d\n", (int)p->stats.propagations ); + printf( "inspects : %8d\n", (int)p->stats.inspects ); +// printf( "inspects2 : %8d\n", (int)p->stats.inspects2 ); +} + +/**Function************************************************************* + + Synopsis [Returns a counter-example.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int * Sat_SolverGetModel( sat_solver * p, int * pVars, int nVars ) +{ + int * pModel; + int i; + pModel = ALLOC( int, nVars ); + for ( i = 0; i < nVars; i++ ) + { + assert( pVars[i] >= 0 && pVars[i] < p->size ); + pModel[i] = (int)(p->model.ptr[pVars[i]] == l_True); + } + return pModel; +} + +/**Function************************************************************* + + Synopsis [Duplicates all clauses, complements unit clause of the given var.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Sat_SolverDoubleClauses( sat_solver * p, int iVar ) +{ + clause * pClause; + lit Lit, * pLits; + int RetValue, nClauses, nVarsOld, nLitsOld, nLits, c, v; + // get the number of variables + nVarsOld = p->size; + nLitsOld = 2 * p->size; + // extend the solver to depend on two sets of variables + sat_solver_setnvars( p, 2 * p->size ); + // duplicate implications + for ( v = 0; v < nVarsOld; v++ ) + if ( p->assigns[v] != l_Undef ) + { + Lit = nLitsOld + toLitCond( v, p->assigns[v]==l_False ); + if ( v == iVar ) + Lit = lit_neg(Lit); + RetValue = sat_solver_addclause( p, &Lit, &Lit + 1 ); + assert( RetValue ); + } + // duplicate clauses + nClauses = vecp_size(&p->clauses); + for ( c = 0; c < nClauses; c++ ) + { + pClause = p->clauses.ptr[c]; + nLits = clause_size(pClause); + pLits = clause_begin(pClause); + for ( v = 0; v < nLits; v++ ) + pLits[v] += nLitsOld; + RetValue = sat_solver_addclause( p, pLits, pLits + nLits ); + assert( RetValue ); + for ( v = 0; v < nLits; v++ ) + pLits[v] -= nLitsOld; + } +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/bsat/satVec.h b/src/sat/bsat/satVec.h new file mode 100644 index 00000000..d7fce5c0 --- /dev/null +++ b/src/sat/bsat/satVec.h @@ -0,0 +1,83 @@ +/************************************************************************************************** +MiniSat -- Copyright (c) 2005, Niklas Sorensson +http://www.cs.chalmers.se/Cs/Research/FormalMethods/MiniSat/ + +Permission is hereby granted, free of charge, to any person obtaining a copy of this software and +associated documentation files (the "Software"), to deal in the Software without restriction, +including without limitation the rights to use, copy, modify, merge, publish, distribute, +sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all copies or +substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT +NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT +OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +**************************************************************************************************/ +// Modified to compile with MS Visual Studio 6.0 by Alan Mishchenko + +#ifndef satVec_h +#define satVec_h + +#include <stdlib.h> + +// vector of 32-bit intergers (added for 64-bit portability) +struct veci_t { + int size; + int cap; + int* ptr; +}; +typedef struct veci_t veci; + +static inline void veci_new (veci* v) { + v->size = 0; + v->cap = 4; + v->ptr = (int*)malloc(sizeof(int)*v->cap); +} + +static inline void veci_delete (veci* v) { free(v->ptr); } +static inline int* veci_begin (veci* v) { return v->ptr; } +static inline int veci_size (veci* v) { return v->size; } +static inline void veci_resize (veci* v, int k) { v->size = k; } // only safe to shrink !! +static inline void veci_push (veci* v, int e) +{ + if (v->size == v->cap) { + int newsize = v->cap * 2;//+1; + v->ptr = (int*)realloc(v->ptr,sizeof(int)*newsize); + v->cap = newsize; } + v->ptr[v->size++] = e; +} + + +// vector of 32- or 64-bit pointers +struct vecp_t { + int size; + int cap; + void** ptr; +}; +typedef struct vecp_t vecp; + +static inline void vecp_new (vecp* v) { + v->size = 0; + v->cap = 4; + v->ptr = (void**)malloc(sizeof(void*)*v->cap); +} + +static inline void vecp_delete (vecp* v) { free(v->ptr); } +static inline void** vecp_begin (vecp* v) { return v->ptr; } +static inline int vecp_size (vecp* v) { return v->size; } +static inline void vecp_resize (vecp* v, int k) { v->size = k; } // only safe to shrink !! +static inline void vecp_push (vecp* v, void* e) +{ + if (v->size == v->cap) { + int newsize = v->cap * 2;//+1; + v->ptr = (void**)realloc(v->ptr,sizeof(void*)*newsize); + v->cap = newsize; } + v->ptr[v->size++] = e; +} + + +#endif diff --git a/src/sat/csat/csat_apis.c b/src/sat/csat/csat_apis.c new file mode 100644 index 00000000..5872f5bc --- /dev/null +++ b/src/sat/csat/csat_apis.c @@ -0,0 +1,769 @@ +/**CFile**************************************************************** + + FileName [csat_apis.h] + + PackageName [Interface to CSAT.] + + Synopsis [APIs, enums, and data structures expected from the use of CSAT.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - August 28, 2005] + + Revision [$Id: csat_apis.h,v 1.00 2005/08/28 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "abc.h" +#include "fraig.h" +#include "csat_apis.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +#define ABC_DEFAULT_CONF_LIMIT 0 // limit on conflicts +#define ABC_DEFAULT_IMP_LIMIT 0 // limit on implications + + +struct ABC_ManagerStruct_t +{ + // information about the problem + stmm_table * tName2Node; // the hash table mapping names to nodes + stmm_table * tNode2Name; // the hash table mapping nodes to names + Abc_Ntk_t * pNtk; // the starting ABC network + Abc_Ntk_t * pTarget; // the AIG representing the target + char * pDumpFileName; // the name of the file to dump the target network + Extra_MmFlex_t * pMmNames; // memory manager for signal names + // solving parameters + int mode; // 0 = resource-aware integration; 1 = brute-force SAT + Prove_Params_t Params; // integrated CEC parameters + // information about the target + int nog; // the numbers of gates in the target + Vec_Ptr_t * vNodes; // the gates in the target + Vec_Int_t * vValues; // the values of gate's outputs in the target + // solution + CSAT_Target_ResultT * pResult; // the result of solving the target +}; + +static CSAT_Target_ResultT * ABC_TargetResAlloc( int nVars ); +static char * ABC_GetNodeName( ABC_Manager mng, Abc_Obj_t * pNode ); + +// procedures to start and stop the ABC framework +extern void Abc_Start(); +extern void Abc_Stop(); + +// some external procedures +extern int Io_WriteBench( Abc_Ntk_t * pNtk, char * FileName ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Creates a new manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +ABC_Manager ABC_InitManager() +{ + ABC_Manager_t * mng; + Abc_Start(); + mng = ALLOC( ABC_Manager_t, 1 ); + memset( mng, 0, sizeof(ABC_Manager_t) ); + mng->pNtk = Abc_NtkAlloc( ABC_NTK_LOGIC, ABC_FUNC_SOP, 1 ); + mng->pNtk->pName = Extra_UtilStrsav("csat_network"); + mng->tName2Node = stmm_init_table(strcmp, stmm_strhash); + mng->tNode2Name = stmm_init_table(stmm_ptrcmp, stmm_ptrhash); + mng->pMmNames = Extra_MmFlexStart(); + mng->vNodes = Vec_PtrAlloc( 100 ); + mng->vValues = Vec_IntAlloc( 100 ); + mng->mode = 0; // set "resource-aware integration" as the default mode + // set default parameters for CEC + Prove_ParamsSetDefault( &mng->Params ); + // set infinite resource limit for the final mitering +// mng->Params.nMiteringLimitLast = ABC_INFINITY; + return mng; +} + +/**Function************************************************************* + + Synopsis [Deletes the manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_ReleaseManager( ABC_Manager mng ) +{ + CSAT_Target_ResultT * p_res = ABC_Get_Target_Result( mng,0 ); + ABC_TargetResFree(p_res); + if ( mng->tNode2Name ) stmm_free_table( mng->tNode2Name ); + if ( mng->tName2Node ) stmm_free_table( mng->tName2Node ); + if ( mng->pMmNames ) Extra_MmFlexStop( mng->pMmNames ); + if ( mng->pNtk ) Abc_NtkDelete( mng->pNtk ); + if ( mng->pTarget ) Abc_NtkDelete( mng->pTarget ); + if ( mng->vNodes ) Vec_PtrFree( mng->vNodes ); + if ( mng->vValues ) Vec_IntFree( mng->vValues ); + FREE( mng->pDumpFileName ); + free( mng ); + Abc_Stop(); +} + +/**Function************************************************************* + + Synopsis [Sets solver options for learning.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SetSolveOption( ABC_Manager mng, enum CSAT_OptionT option ) +{ +} + +/**Function************************************************************* + + Synopsis [Sets solving mode by brute-force SAT.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_UseOnlyCoreSatSolver( ABC_Manager mng ) +{ + mng->mode = 1; // switch to "brute-force SAT" as the solving option +} + +/**Function************************************************************* + + Synopsis [Adds a gate to the circuit.] + + Description [The meaning of the parameters are: + type: the type of the gate to be added + name: the name of the gate to be added, name should be unique in a circuit. + nofi: number of fanins of the gate to be added; + fanins: the name array of fanins of the gate to be added.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int ABC_AddGate( ABC_Manager mng, enum GateType type, char * name, int nofi, char ** fanins, int dc_attr ) +{ + Abc_Obj_t * pObj, * pFanin; + char * pSop, * pNewName; + int i; + + // save the name in the local memory manager + pNewName = Extra_MmFlexEntryFetch( mng->pMmNames, strlen(name) + 1 ); + strcpy( pNewName, name ); + name = pNewName; + + // consider different cases, create the node, and map the node into the name + switch( type ) + { + case CSAT_BPI: + case CSAT_BPPI: + if ( nofi != 0 ) + { printf( "ABC_AddGate: The PI/PPI gate \"%s\" has fanins.\n", name ); return 0; } + // create the PI + pObj = Abc_NtkCreatePi( mng->pNtk ); + stmm_insert( mng->tNode2Name, (char *)pObj, name ); + break; + case CSAT_CONST: + case CSAT_BAND: + case CSAT_BNAND: + case CSAT_BOR: + case CSAT_BNOR: + case CSAT_BXOR: + case CSAT_BXNOR: + case CSAT_BINV: + case CSAT_BBUF: + // create the node + pObj = Abc_NtkCreateNode( mng->pNtk ); + // create the fanins + for ( i = 0; i < nofi; i++ ) + { + if ( !stmm_lookup( mng->tName2Node, fanins[i], (char **)&pFanin ) ) + { printf( "ABC_AddGate: The fanin gate \"%s\" is not in the network.\n", fanins[i] ); return 0; } + Abc_ObjAddFanin( pObj, pFanin ); + } + // create the node function + switch( type ) + { + case CSAT_CONST: + if ( nofi != 0 ) + { printf( "ABC_AddGate: The constant gate \"%s\" has fanins.\n", name ); return 0; } + pSop = Abc_SopCreateConst1( mng->pNtk->pManFunc ); + break; + case CSAT_BAND: + if ( nofi < 1 ) + { printf( "ABC_AddGate: The AND gate \"%s\" no fanins.\n", name ); return 0; } + pSop = Abc_SopCreateAnd( mng->pNtk->pManFunc, nofi, NULL ); + break; + case CSAT_BNAND: + if ( nofi < 1 ) + { printf( "ABC_AddGate: The NAND gate \"%s\" no fanins.\n", name ); return 0; } + pSop = Abc_SopCreateNand( mng->pNtk->pManFunc, nofi ); + break; + case CSAT_BOR: + if ( nofi < 1 ) + { printf( "ABC_AddGate: The OR gate \"%s\" no fanins.\n", name ); return 0; } + pSop = Abc_SopCreateOr( mng->pNtk->pManFunc, nofi, NULL ); + break; + case CSAT_BNOR: + if ( nofi < 1 ) + { printf( "ABC_AddGate: The NOR gate \"%s\" no fanins.\n", name ); return 0; } + pSop = Abc_SopCreateNor( mng->pNtk->pManFunc, nofi ); + break; + case CSAT_BXOR: + if ( nofi < 1 ) + { printf( "ABC_AddGate: The XOR gate \"%s\" no fanins.\n", name ); return 0; } + if ( nofi > 2 ) + { printf( "ABC_AddGate: The XOR gate \"%s\" has more than two fanins.\n", name ); return 0; } + pSop = Abc_SopCreateXor( mng->pNtk->pManFunc, nofi ); + break; + case CSAT_BXNOR: + if ( nofi < 1 ) + { printf( "ABC_AddGate: The XNOR gate \"%s\" no fanins.\n", name ); return 0; } + if ( nofi > 2 ) + { printf( "ABC_AddGate: The XNOR gate \"%s\" has more than two fanins.\n", name ); return 0; } + pSop = Abc_SopCreateNxor( mng->pNtk->pManFunc, nofi ); + break; + case CSAT_BINV: + if ( nofi != 1 ) + { printf( "ABC_AddGate: The inverter gate \"%s\" does not have exactly one fanin.\n", name ); return 0; } + pSop = Abc_SopCreateInv( mng->pNtk->pManFunc ); + break; + case CSAT_BBUF: + if ( nofi != 1 ) + { printf( "ABC_AddGate: The buffer gate \"%s\" does not have exactly one fanin.\n", name ); return 0; } + pSop = Abc_SopCreateBuf( mng->pNtk->pManFunc ); + break; + default : + break; + } + Abc_ObjSetData( pObj, pSop ); + break; + case CSAT_BPPO: + case CSAT_BPO: + if ( nofi != 1 ) + { printf( "ABC_AddGate: The PO/PPO gate \"%s\" does not have exactly one fanin.\n", name ); return 0; } + // create the PO + pObj = Abc_NtkCreatePo( mng->pNtk ); + stmm_insert( mng->tNode2Name, (char *)pObj, name ); + // connect to the PO fanin + if ( !stmm_lookup( mng->tName2Node, fanins[0], (char **)&pFanin ) ) + { printf( "ABC_AddGate: The fanin gate \"%s\" is not in the network.\n", fanins[0] ); return 0; } + Abc_ObjAddFanin( pObj, pFanin ); + break; + default: + printf( "ABC_AddGate: Unknown gate type.\n" ); + break; + } + + // map the name into the node + if ( stmm_insert( mng->tName2Node, name, (char *)pObj ) ) + { printf( "ABC_AddGate: The same gate \"%s\" is added twice.\n", name ); return 0; } + return 1; +} + +/**Function************************************************************* + + Synopsis [This procedure also finalizes construction of the ABC network.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_Network_Finalize( ABC_Manager mng ) +{ + Abc_Ntk_t * pNtk = mng->pNtk; + Abc_Obj_t * pObj; + int i; + Abc_NtkForEachPi( pNtk, pObj, i ) + Abc_ObjAssignName( pObj, ABC_GetNodeName(mng, pObj), NULL ); + Abc_NtkForEachPo( pNtk, pObj, i ) + Abc_ObjAssignName( pObj, ABC_GetNodeName(mng, pObj), NULL ); + assert( Abc_NtkLatchNum(pNtk) == 0 ); +} + +/**Function************************************************************* + + Synopsis [Checks integraty of the manager.] + + Description [Checks if there are gates that are not used by any primary output. + If no such gates exist, return 1 else return 0.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int ABC_Check_Integrity( ABC_Manager mng ) +{ + Abc_Ntk_t * pNtk = mng->pNtk; + Abc_Obj_t * pObj; + int i; + + // check that there are no dangling nodes + Abc_NtkForEachNode( pNtk, pObj, i ) + { + if ( i == 0 ) + continue; + if ( Abc_ObjFanoutNum(pObj) == 0 ) + { +// printf( "ABC_Check_Integrity: The network has dangling nodes.\n" ); + return 0; + } + } + + // make sure everything is okay with the network structure + if ( !Abc_NtkDoCheck( pNtk ) ) + { + printf( "ABC_Check_Integrity: The internal network check has failed.\n" ); + return 0; + } + return 1; +} + +/**Function************************************************************* + + Synopsis [Sets time limit for solving a target.] + + Description [Runtime: time limit (in second).] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SetTimeLimit( ABC_Manager mng, int runtime ) +{ +// printf( "ABC_SetTimeLimit: The resource limit is not implemented (warning).\n" ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SetLearnLimit( ABC_Manager mng, int num ) +{ +// printf( "ABC_SetLearnLimit: The resource limit is not implemented (warning).\n" ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SetLearnBacktrackLimit( ABC_Manager mng, int num ) +{ +// printf( "ABC_SetLearnBacktrackLimit: The resource limit is not implemented (warning).\n" ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SetSolveBacktrackLimit( ABC_Manager mng, int num ) +{ + mng->Params.nMiteringLimitLast = num; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SetSolveImplicationLimit( ABC_Manager mng, int num ) +{ +// printf( "ABC_SetSolveImplicationLimit: The resource limit is not implemented (warning).\n" ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SetTotalBacktrackLimit( ABC_Manager mng, uint64 num ) +{ + mng->Params.nTotalBacktrackLimit = num; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SetTotalInspectLimit( ABC_Manager mng, uint64 num ) +{ + mng->Params.nTotalInspectLimit = num; +} +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +uint64 ABC_GetTotalBacktracksMade( ABC_Manager mng ) +{ + return mng->Params.nTotalBacktracksMade; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +uint64 ABC_GetTotalInspectsMade( ABC_Manager mng ) +{ + return mng->Params.nTotalInspectsMade; +} + +/**Function************************************************************* + + Synopsis [Sets the file name to dump the structurally hashed network used for solving.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_EnableDump( ABC_Manager mng, char * dump_file ) +{ + FREE( mng->pDumpFileName ); + mng->pDumpFileName = Extra_UtilStrsav( dump_file ); +} + +/**Function************************************************************* + + Synopsis [Adds a new target to the manager.] + + Description [The meaning of the parameters are: + nog: number of gates that are in the targets, + names: name array of gates, + values: value array of the corresponding gates given in "names" to be solved. + The relation of them is AND.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int ABC_AddTarget( ABC_Manager mng, int nog, char ** names, int * values ) +{ + Abc_Obj_t * pObj; + int i; + if ( nog < 1 ) + { printf( "ABC_AddTarget: The target has no gates.\n" ); return 0; } + // clear storage for the target + mng->nog = 0; + Vec_PtrClear( mng->vNodes ); + Vec_IntClear( mng->vValues ); + // save the target + for ( i = 0; i < nog; i++ ) + { + if ( !stmm_lookup( mng->tName2Node, names[i], (char **)&pObj ) ) + { printf( "ABC_AddTarget: The target gate \"%s\" is not in the network.\n", names[i] ); return 0; } + Vec_PtrPush( mng->vNodes, pObj ); + if ( values[i] < 0 || values[i] > 1 ) + { printf( "ABC_AddTarget: The value of gate \"%s\" is not 0 or 1.\n", names[i] ); return 0; } + Vec_IntPush( mng->vValues, values[i] ); + } + mng->nog = nog; + return 1; +} + +/**Function************************************************************* + + Synopsis [Initialize the solver internal data structure.] + + Description [Prepares the solver to work on one specific target + set by calling ABC_AddTarget before.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_SolveInit( ABC_Manager mng ) +{ + // check if the target is available + assert( mng->nog == Vec_PtrSize(mng->vNodes) ); + if ( mng->nog == 0 ) + { printf( "ABC_SolveInit: Target is not specified by ABC_AddTarget().\n" ); return; } + + // free the previous target network if present + if ( mng->pTarget ) Abc_NtkDelete( mng->pTarget ); + + // set the new target network +// mng->pTarget = Abc_NtkCreateTarget( mng->pNtk, mng->vNodes, mng->vValues ); + mng->pTarget = Abc_NtkStrash( mng->pNtk, 0, 1, 0 ); +} + +/**Function************************************************************* + + Synopsis [Currently not implemented.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_AnalyzeTargets( ABC_Manager mng ) +{ +} + +/**Function************************************************************* + + Synopsis [Solves the targets added by ABC_AddTarget().] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +enum CSAT_StatusT ABC_Solve( ABC_Manager mng ) +{ + Prove_Params_t * pParams = &mng->Params; + int RetValue, i; + + // check if the target network is available + if ( mng->pTarget == NULL ) + { printf( "ABC_Solve: Target network is not derived by ABC_SolveInit().\n" ); return UNDETERMINED; } + + // try to prove the miter using a number of techniques + if ( mng->mode ) + RetValue = Abc_NtkMiterSat( mng->pTarget, (sint64)pParams->nMiteringLimitLast, (sint64)0, 0, NULL, NULL ); + else +// RetValue = Abc_NtkMiterProve( &mng->pTarget, pParams ); // old CEC engine + RetValue = Abc_NtkIvyProve( &mng->pTarget, pParams ); // new CEC engine + + // analyze the result + mng->pResult = ABC_TargetResAlloc( Abc_NtkCiNum(mng->pTarget) ); + if ( RetValue == -1 ) + mng->pResult->status = UNDETERMINED; + else if ( RetValue == 1 ) + mng->pResult->status = UNSATISFIABLE; + else if ( RetValue == 0 ) + { + mng->pResult->status = SATISFIABLE; + // create the array of PI names and values + for ( i = 0; i < mng->pResult->no_sig; i++ ) + { + mng->pResult->names[i] = Extra_UtilStrsav( ABC_GetNodeName(mng, Abc_NtkCi(mng->pNtk, i)) ); + mng->pResult->values[i] = mng->pTarget->pModel[i]; + } + FREE( mng->pTarget->pModel ); + } + else assert( 0 ); + + // delete the target + Abc_NtkDelete( mng->pTarget ); + mng->pTarget = NULL; + // return the status + return mng->pResult->status; +} + +/**Function************************************************************* + + Synopsis [Gets the solve status of a target.] + + Description [TargetID: the target id returned by ABC_AddTarget().] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +CSAT_Target_ResultT * ABC_Get_Target_Result( ABC_Manager mng, int TargetID ) +{ + return mng->pResult; +} + +/**Function************************************************************* + + Synopsis [Dumps the original network into the BENCH file.] + + Description [This procedure should be modified to dump the target.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_Dump_Bench_File( ABC_Manager mng ) +{ + Abc_Ntk_t * pNtkTemp, * pNtkAig; + char * pFileName; + + // derive the netlist + pNtkAig = Abc_NtkStrash( mng->pNtk, 0, 0, 0 ); + pNtkTemp = Abc_NtkToNetlistBench( pNtkAig ); + Abc_NtkDelete( pNtkAig ); + if ( pNtkTemp == NULL ) + { printf( "ABC_Dump_Bench_File: Dumping BENCH has failed.\n" ); return; } + pFileName = mng->pDumpFileName? mng->pDumpFileName: "abc_test.bench"; + Io_WriteBench( pNtkTemp, pFileName ); + Abc_NtkDelete( pNtkTemp ); +} + + + +/**Function************************************************************* + + Synopsis [Allocates the target result.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +CSAT_Target_ResultT * ABC_TargetResAlloc( int nVars ) +{ + CSAT_Target_ResultT * p; + p = ALLOC( CSAT_Target_ResultT, 1 ); + memset( p, 0, sizeof(CSAT_Target_ResultT) ); + p->no_sig = nVars; + p->names = ALLOC( char *, nVars ); + p->values = ALLOC( int, nVars ); + memset( p->names, 0, sizeof(char *) * nVars ); + memset( p->values, 0, sizeof(int) * nVars ); + return p; +} + +/**Function************************************************************* + + Synopsis [Deallocates the target result.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void ABC_TargetResFree( CSAT_Target_ResultT * p ) +{ + if ( p == NULL ) + return; + if( p->names ) + { + int i = 0; + for ( i = 0; i < p->no_sig; i++ ) + { + FREE(p->names[i]); + } + } + FREE( p->names ); + FREE( p->values ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Dumps the target AIG into the BENCH file.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * ABC_GetNodeName( ABC_Manager mng, Abc_Obj_t * pNode ) +{ + char * pName = NULL; + if ( !stmm_lookup( mng->tNode2Name, (char *)pNode, (char **)&pName ) ) + { + assert( 0 ); + } + return pName; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/csat/csat_apis.h b/src/sat/csat/csat_apis.h new file mode 100644 index 00000000..b80eddbf --- /dev/null +++ b/src/sat/csat/csat_apis.h @@ -0,0 +1,222 @@ +/**CFile**************************************************************** + + FileName [csat_apis.h] + + PackageName [Interface to CSAT.] + + Synopsis [APIs, enums, and data structures expected from the use of CSAT.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - August 28, 2005] + + Revision [$Id: csat_apis.h,v 1.5 2005/12/30 10:54:40 rmukherj Exp $] + +***********************************************************************/ + +#ifndef __ABC_APIS_H__ +#define __ABC_APIS_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +//////////////////////////////////////////////////////////////////////// +/// INCLUDES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// PARAMETERS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// STRUCTURE DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + + +typedef struct ABC_ManagerStruct_t ABC_Manager_t; +typedef struct ABC_ManagerStruct_t * ABC_Manager; + + +// GateType defines the gate type that can be added to circuit by +// ABC_AddGate(); +#ifndef _ABC_GATE_TYPE_ +#define _ABC_GATE_TYPE_ +enum GateType +{ + CSAT_CONST = 0, // constant gate + CSAT_BPI, // boolean PI + CSAT_BPPI, // bit level PSEUDO PRIMARY INPUT + CSAT_BAND, // bit level AND + CSAT_BNAND, // bit level NAND + CSAT_BOR, // bit level OR + CSAT_BNOR, // bit level NOR + CSAT_BXOR, // bit level XOR + CSAT_BXNOR, // bit level XNOR + CSAT_BINV, // bit level INVERTER + CSAT_BBUF, // bit level BUFFER + CSAT_BMUX, // bit level MUX --not supported + CSAT_BDFF, // bit level D-type FF + CSAT_BSDFF, // bit level scan FF --not supported + CSAT_BTRIH, // bit level TRISTATE gate with active high control --not supported + CSAT_BTRIL, // bit level TRISTATE gate with active low control --not supported + CSAT_BBUS, // bit level BUS --not supported + CSAT_BPPO, // bit level PSEUDO PRIMARY OUTPUT + CSAT_BPO, // boolean PO + CSAT_BCNF, // boolean constraint + CSAT_BDC, // boolean don't care gate (2 input) +}; +#endif + + +//CSAT_StatusT defines the return value by ABC_Solve(); +#ifndef _ABC_STATUS_ +#define _ABC_STATUS_ +enum CSAT_StatusT +{ + UNDETERMINED = 0, + UNSATISFIABLE, + SATISFIABLE, + TIME_OUT, + FRAME_OUT, + NO_TARGET, + ABORTED, + SEQ_SATISFIABLE +}; +#endif + + +// to identify who called the CSAT solver +#ifndef _ABC_CALLER_ +#define _ABC_CALLER_ +enum CSAT_CallerT +{ + BLS = 0, + SATORI, + NONE +}; +#endif + + +// CSAT_OptionT defines the solver option about learning +// which is used by ABC_SetSolveOption(); +#ifndef _ABC_OPTION_ +#define _ABC_OPTION_ +enum CSAT_OptionT +{ + BASE_LINE = 0, + IMPLICT_LEARNING, //default + EXPLICT_LEARNING +}; +#endif + + +#ifndef _ABC_Target_Result +#define _ABC_Target_Result +typedef struct _CSAT_Target_ResultT CSAT_Target_ResultT; +struct _CSAT_Target_ResultT +{ + enum CSAT_StatusT status; // solve status of the target + int num_dec; // num of decisions to solve the target + int num_imp; // num of implications to solve the target + int num_cftg; // num of conflict gates learned + int num_cfts; // num of conflict signals in conflict gates + double time; // time(in second) used to solve the target + int no_sig; // if "status" is SATISFIABLE, "no_sig" is the number of + // primary inputs, if the "status" is TIME_OUT, "no_sig" is the + // number of constant signals found. + char** names; // if the "status" is SATISFIABLE, "names" is the name array of + // primary inputs, "values" is the value array of primary + // inputs that satisfy the target. + // if the "status" is TIME_OUT, "names" is the name array of + // constant signals found (signals at the root of decision + // tree), "values" is the value array of constant signals found. + int* values; +}; +#endif + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +// create a new manager +extern ABC_Manager ABC_InitManager(void); + +// release a manager +extern void ABC_ReleaseManager(ABC_Manager mng); + +// set solver options for learning +extern void ABC_SetSolveOption(ABC_Manager mng, enum CSAT_OptionT option); + +// enable checking by brute-force SAT solver (MiniSat-1.14) +extern void ABC_UseOnlyCoreSatSolver(ABC_Manager mng); + + +// add a gate to the circuit +// the meaning of the parameters are: +// type: the type of the gate to be added +// name: the name of the gate to be added, name should be unique in a circuit. +// nofi: number of fanins of the gate to be added; +// fanins: the name array of fanins of the gate to be added +extern int ABC_AddGate(ABC_Manager mng, + enum GateType type, + char* name, + int nofi, + char** fanins, + int dc_attr); + +// check if there are gates that are not used by any primary ouput. +// if no such gates exist, return 1 else return 0; +extern int ABC_Check_Integrity(ABC_Manager mng); + +// THIS PROCEDURE SHOULD BE CALLED AFTER THE NETWORK IS CONSTRUCTED!!! +extern void ABC_Network_Finalize( ABC_Manager mng ); + +// set time limit for solving a target. +// runtime: time limit (in second). +extern void ABC_SetTimeLimit(ABC_Manager mng, int runtime); +extern void ABC_SetLearnLimit(ABC_Manager mng, int num); +extern void ABC_SetSolveBacktrackLimit(ABC_Manager mng, int num); +extern void ABC_SetLearnBacktrackLimit(ABC_Manager mng, int num); +extern void ABC_EnableDump(ABC_Manager mng, char* dump_file); + +extern void ABC_SetTotalBacktrackLimit( ABC_Manager mng, uint64 num ); +extern void ABC_SetTotalInspectLimit( ABC_Manager mng, uint64 num ); +extern uint64 ABC_GetTotalBacktracksMade( ABC_Manager mng ); +extern uint64 ABC_GetTotalInspectsMade( ABC_Manager mng ); + +// the meaning of the parameters are: +// nog: number of gates that are in the targets +// names: name array of gates +// values: value array of the corresponding gates given in "names" to be +// solved. the relation of them is AND. +extern int ABC_AddTarget(ABC_Manager mng, int nog, char**names, int* values); + +// initialize the solver internal data structure. +extern void ABC_SolveInit(ABC_Manager mng); +extern void ABC_AnalyzeTargets(ABC_Manager mng); + +// solve the targets added by ABC_AddTarget() +extern enum CSAT_StatusT ABC_Solve(ABC_Manager mng); + +// get the solve status of a target +// TargetID: the target id returned by ABC_AddTarget(). +extern CSAT_Target_ResultT * ABC_Get_Target_Result(ABC_Manager mng, int TargetID); +extern void ABC_Dump_Bench_File(ABC_Manager mng); + +// ADDED PROCEDURES: +extern void ABC_TargetResFree( CSAT_Target_ResultT * p ); + +extern void CSAT_SetCaller(ABC_Manager mng, enum CSAT_CallerT caller); + +#ifdef __cplusplus +} +#endif + +#endif + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// diff --git a/src/sat/csat/module.make b/src/sat/csat/module.make new file mode 100644 index 00000000..5b71a03c --- /dev/null +++ b/src/sat/csat/module.make @@ -0,0 +1 @@ +SRC += src/sat/csat/csat_apis.c diff --git a/src/sat/fraig/fraig.h b/src/sat/fraig/fraig.h new file mode 100644 index 00000000..1dad21e2 --- /dev/null +++ b/src/sat/fraig/fraig.h @@ -0,0 +1,267 @@ +/**CFile**************************************************************** + + FileName [fraig.h] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [External declarations of the FRAIG package.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraig.h,v 1.18 2005/07/08 01:01:30 alanmi Exp $] + +***********************************************************************/ + +#ifndef __FRAIG_H__ +#define __FRAIG_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +//////////////////////////////////////////////////////////////////////// +/// INCLUDES /// +//////////////////////////////////////////////////////////////////////// + +#ifndef SINT64 +#define SINT64 + +#ifdef _WIN32 +typedef signed __int64 sint64; // compatible with MS VS 6.0 +#else +typedef long long sint64; +#endif + +#endif + +//////////////////////////////////////////////////////////////////////// +/// PARAMETERS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// STRUCTURE DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +typedef struct Fraig_ManStruct_t_ Fraig_Man_t; +typedef struct Fraig_NodeStruct_t_ Fraig_Node_t; +typedef struct Fraig_NodeVecStruct_t_ Fraig_NodeVec_t; +typedef struct Fraig_HashTableStruct_t_ Fraig_HashTable_t; +typedef struct Fraig_ParamsStruct_t_ Fraig_Params_t; +typedef struct Fraig_PatternsStruct_t_ Fraig_Patterns_t; +typedef struct Prove_ParamsStruct_t_ Prove_Params_t; + +struct Fraig_ParamsStruct_t_ +{ + int nPatsRand; // the number of words of random simulation info + int nPatsDyna; // the number of words of dynamic simulation info + int nBTLimit; // the max number of backtracks to perform + int nSeconds; // the timeout for the final proof + int fFuncRed; // performs only one level hashing + int fFeedBack; // enables solver feedback + int fDist1Pats; // enables distance-1 patterns + int fDoSparse; // performs equiv tests for sparse functions + int fChoicing; // enables recording structural choices + int fTryProve; // tries to solve the final miter + int fVerbose; // the verbosiness flag + int fVerboseP; // the verbosiness flag (for proof reporting) + int fInternal; // is set to 1 for internal fraig calls + int nConfLimit; // the limit on the number of conflicts + sint64 nInspLimit; // the limit on the number of inspections +}; + +struct Prove_ParamsStruct_t_ +{ + // general parameters + int fUseFraiging; // enables fraiging + int fUseRewriting; // enables rewriting + int fUseBdds; // enables BDD construction when other methods fail + int fVerbose; // prints verbose stats + // iterations + int nItersMax; // the number of iterations + // mitering + int nMiteringLimitStart; // starting mitering limit + float nMiteringLimitMulti; // multiplicative coefficient to increase the limit in each iteration + // rewriting + int nRewritingLimitStart; // the number of rewriting iterations + float nRewritingLimitMulti; // multiplicative coefficient to increase the limit in each iteration + // fraiging + int nFraigingLimitStart; // starting backtrack(conflict) limit + float nFraigingLimitMulti; // multiplicative coefficient to increase the limit in each iteration + // last-gasp BDD construction + int nBddSizeLimit; // the number of BDD nodes when construction is aborted + int fBddReorder; // enables dynamic BDD variable reordering + // last-gasp mitering + int nMiteringLimitLast; // final mitering limit + // global SAT solver limits + sint64 nTotalBacktrackLimit; // global limit on the number of backtracks + sint64 nTotalInspectLimit; // global limit on the number of clause inspects + // global resources applied + sint64 nTotalBacktracksMade; // the total number of backtracks made + sint64 nTotalInspectsMade; // the total number of inspects made +}; + +//////////////////////////////////////////////////////////////////////// +/// GLOBAL VARIABLES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// MACRO DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +// macros working with complemented attributes of the nodes +#define Fraig_IsComplement(p) (((int)((unsigned long) (p) & 01))) +#define Fraig_Regular(p) ((Fraig_Node_t *)((unsigned long)(p) & ~01)) +#define Fraig_Not(p) ((Fraig_Node_t *)((unsigned long)(p) ^ 01)) +#define Fraig_NotCond(p,c) ((Fraig_Node_t *)((unsigned long)(p) ^ (c))) + +// these are currently not used +#define Fraig_Ref(p) +#define Fraig_Deref(p) +#define Fraig_RecursiveDeref(p,c) + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/*=== fraigApi.c =============================================================*/ +extern Fraig_NodeVec_t * Fraig_ManReadVecInputs( Fraig_Man_t * p ); +extern Fraig_NodeVec_t * Fraig_ManReadVecOutputs( Fraig_Man_t * p ); +extern Fraig_NodeVec_t * Fraig_ManReadVecNodes( Fraig_Man_t * p ); +extern Fraig_Node_t ** Fraig_ManReadInputs ( Fraig_Man_t * p ); +extern Fraig_Node_t ** Fraig_ManReadOutputs( Fraig_Man_t * p ); +extern Fraig_Node_t ** Fraig_ManReadNodes( Fraig_Man_t * p ); +extern int Fraig_ManReadInputNum ( Fraig_Man_t * p ); +extern int Fraig_ManReadOutputNum( Fraig_Man_t * p ); +extern int Fraig_ManReadNodeNum( Fraig_Man_t * p ); +extern Fraig_Node_t * Fraig_ManReadConst1 ( Fraig_Man_t * p ); +extern Fraig_Node_t * Fraig_ManReadIthVar( Fraig_Man_t * p, int i ); +extern Fraig_Node_t * Fraig_ManReadIthNode( Fraig_Man_t * p, int i ); +extern char ** Fraig_ManReadInputNames( Fraig_Man_t * p ); +extern char ** Fraig_ManReadOutputNames( Fraig_Man_t * p ); +extern char * Fraig_ManReadVarsInt( Fraig_Man_t * p ); +extern char * Fraig_ManReadSat( Fraig_Man_t * p ); +extern int Fraig_ManReadFuncRed( Fraig_Man_t * p ); +extern int Fraig_ManReadFeedBack( Fraig_Man_t * p ); +extern int Fraig_ManReadDoSparse( Fraig_Man_t * p ); +extern int Fraig_ManReadChoicing( Fraig_Man_t * p ); +extern int Fraig_ManReadVerbose( Fraig_Man_t * p ); +extern int * Fraig_ManReadModel( Fraig_Man_t * p ); +extern int Fraig_ManReadPatternNumRandom( Fraig_Man_t * p ); +extern int Fraig_ManReadPatternNumDynamic( Fraig_Man_t * p ); +extern int Fraig_ManReadPatternNumDynamicFiltered( Fraig_Man_t * p ); +extern int Fraig_ManReadSatFails( Fraig_Man_t * p ); +extern int Fraig_ManReadConflicts( Fraig_Man_t * p ); +extern int Fraig_ManReadInspects( Fraig_Man_t * p ); + +extern void Fraig_ManSetFuncRed( Fraig_Man_t * p, int fFuncRed ); +extern void Fraig_ManSetFeedBack( Fraig_Man_t * p, int fFeedBack ); +extern void Fraig_ManSetDoSparse( Fraig_Man_t * p, int fDoSparse ); +extern void Fraig_ManSetChoicing( Fraig_Man_t * p, int fChoicing ); +extern void Fraig_ManSetTryProve( Fraig_Man_t * p, int fTryProve ); +extern void Fraig_ManSetVerbose( Fraig_Man_t * p, int fVerbose ); +extern void Fraig_ManSetTimeToGraph( Fraig_Man_t * p, int Time ); +extern void Fraig_ManSetTimeToNet( Fraig_Man_t * p, int Time ); +extern void Fraig_ManSetTimeTotal( Fraig_Man_t * p, int Time ); +extern void Fraig_ManSetOutputNames( Fraig_Man_t * p, char ** ppNames ); +extern void Fraig_ManSetInputNames( Fraig_Man_t * p, char ** ppNames ); +extern void Fraig_ManSetPo( Fraig_Man_t * p, Fraig_Node_t * pNode ); + +extern Fraig_Node_t * Fraig_NodeReadData0( Fraig_Node_t * p ); +extern Fraig_Node_t * Fraig_NodeReadData1( Fraig_Node_t * p ); +extern int Fraig_NodeReadNum( Fraig_Node_t * p ); +extern Fraig_Node_t * Fraig_NodeReadOne( Fraig_Node_t * p ); +extern Fraig_Node_t * Fraig_NodeReadTwo( Fraig_Node_t * p ); +extern Fraig_Node_t * Fraig_NodeReadNextE( Fraig_Node_t * p ); +extern Fraig_Node_t * Fraig_NodeReadRepr( Fraig_Node_t * p ); +extern int Fraig_NodeReadNumRefs( Fraig_Node_t * p ); +extern int Fraig_NodeReadNumFanouts( Fraig_Node_t * p ); +extern int Fraig_NodeReadSimInv( Fraig_Node_t * p ); +extern int Fraig_NodeReadNumOnes( Fraig_Node_t * p ); +extern unsigned * Fraig_NodeReadPatternsRandom( Fraig_Node_t * p ); +extern unsigned * Fraig_NodeReadPatternsDynamic( Fraig_Node_t * p ); + +extern void Fraig_NodeSetData0( Fraig_Node_t * p, Fraig_Node_t * pData ); +extern void Fraig_NodeSetData1( Fraig_Node_t * p, Fraig_Node_t * pData ); + +extern int Fraig_NodeIsConst( Fraig_Node_t * p ); +extern int Fraig_NodeIsVar( Fraig_Node_t * p ); +extern int Fraig_NodeIsAnd( Fraig_Node_t * p ); +extern int Fraig_NodeComparePhase( Fraig_Node_t * p1, Fraig_Node_t * p2 ); + +extern Fraig_Node_t * Fraig_NodeOr( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ); +extern Fraig_Node_t * Fraig_NodeAnd( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ); +extern Fraig_Node_t * Fraig_NodeOr( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ); +extern Fraig_Node_t * Fraig_NodeExor( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ); +extern Fraig_Node_t * Fraig_NodeMux( Fraig_Man_t * p, Fraig_Node_t * pNode, Fraig_Node_t * pNodeT, Fraig_Node_t * pNodeE ); +extern void Fraig_NodeSetChoice( Fraig_Man_t * pMan, Fraig_Node_t * pNodeOld, Fraig_Node_t * pNodeNew ); + +/*=== fraigMan.c =============================================================*/ +extern void Prove_ParamsSetDefault( Prove_Params_t * pParams ); +extern void Fraig_ParamsSetDefault( Fraig_Params_t * pParams ); +extern void Fraig_ParamsSetDefaultFull( Fraig_Params_t * pParams ); +extern Fraig_Man_t * Fraig_ManCreate( Fraig_Params_t * pParams ); +extern void Fraig_ManFree( Fraig_Man_t * pMan ); +extern void Fraig_ManPrintStats( Fraig_Man_t * p ); +extern Fraig_NodeVec_t * Fraig_ManGetSimInfo( Fraig_Man_t * p ); +extern int Fraig_ManCheckClauseUsingSimInfo( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 ); +extern void Fraig_ManAddClause( Fraig_Man_t * p, Fraig_Node_t ** ppNodes, int nNodes ); + +/*=== fraigDfs.c =============================================================*/ +extern Fraig_NodeVec_t * Fraig_Dfs( Fraig_Man_t * pMan, int fEquiv ); +extern Fraig_NodeVec_t * Fraig_DfsOne( Fraig_Man_t * pMan, Fraig_Node_t * pNode, int fEquiv ); +extern Fraig_NodeVec_t * Fraig_DfsNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppNodes, int nNodes, int fEquiv ); +extern Fraig_NodeVec_t * Fraig_DfsReverse( Fraig_Man_t * pMan ); +extern int Fraig_CountNodes( Fraig_Man_t * pMan, int fEquiv ); +extern int Fraig_CheckTfi( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ); +extern int Fraig_CountLevels( Fraig_Man_t * pMan ); + +/*=== fraigSat.c =============================================================*/ +extern int Fraig_NodesAreEqual( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit, int nTimeLimit ); +extern int Fraig_NodeIsEquivalent( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit, int nTimeLimit ); +extern void Fraig_ManProveMiter( Fraig_Man_t * p ); +extern int Fraig_ManCheckMiter( Fraig_Man_t * p ); +extern int Fraig_ManCheckClauseUsingSat( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit ); + +/*=== fraigVec.c ===============================================================*/ +extern Fraig_NodeVec_t * Fraig_NodeVecAlloc( int nCap ); +extern void Fraig_NodeVecFree( Fraig_NodeVec_t * p ); +extern Fraig_NodeVec_t * Fraig_NodeVecDup( Fraig_NodeVec_t * p ); +extern Fraig_Node_t ** Fraig_NodeVecReadArray( Fraig_NodeVec_t * p ); +extern int Fraig_NodeVecReadSize( Fraig_NodeVec_t * p ); +extern void Fraig_NodeVecGrow( Fraig_NodeVec_t * p, int nCapMin ); +extern void Fraig_NodeVecShrink( Fraig_NodeVec_t * p, int nSizeNew ); +extern void Fraig_NodeVecClear( Fraig_NodeVec_t * p ); +extern void Fraig_NodeVecPush( Fraig_NodeVec_t * p, Fraig_Node_t * Entry ); +extern int Fraig_NodeVecPushUnique( Fraig_NodeVec_t * p, Fraig_Node_t * Entry ); +extern void Fraig_NodeVecPushOrder( Fraig_NodeVec_t * p, Fraig_Node_t * pNode ); +extern int Fraig_NodeVecPushUniqueOrder( Fraig_NodeVec_t * p, Fraig_Node_t * pNode ); +extern void Fraig_NodeVecPushOrderByLevel( Fraig_NodeVec_t * p, Fraig_Node_t * pNode ); +extern int Fraig_NodeVecPushUniqueOrderByLevel( Fraig_NodeVec_t * p, Fraig_Node_t * pNode ); +extern Fraig_Node_t * Fraig_NodeVecPop( Fraig_NodeVec_t * p ); +extern void Fraig_NodeVecRemove( Fraig_NodeVec_t * p, Fraig_Node_t * Entry ); +extern void Fraig_NodeVecWriteEntry( Fraig_NodeVec_t * p, int i, Fraig_Node_t * Entry ); +extern Fraig_Node_t * Fraig_NodeVecReadEntry( Fraig_NodeVec_t * p, int i ); +extern void Fraig_NodeVecSortByLevel( Fraig_NodeVec_t * p, int fIncreasing ); +extern void Fraig_NodeVecSortByNumber( Fraig_NodeVec_t * p ); + +/*=== fraigUtil.c ===============================================================*/ +extern void Fraig_ManMarkRealFanouts( Fraig_Man_t * p ); +extern int Fraig_ManCheckConsistency( Fraig_Man_t * p ); +extern int Fraig_GetMaxLevel( Fraig_Man_t * pMan ); +extern void Fraig_ManReportChoices( Fraig_Man_t * pMan ); +extern void Fraig_MappingSetChoiceLevels( Fraig_Man_t * pMan, int fMaximum ); +extern Fraig_NodeVec_t * Fraig_CollectSupergate( Fraig_Node_t * pNode, int fStopAtMux ); + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/src/sat/fraig/fraigApi.c b/src/sat/fraig/fraigApi.c new file mode 100644 index 00000000..79a7c224 --- /dev/null +++ b/src/sat/fraig/fraigApi.c @@ -0,0 +1,297 @@ +/**CFile**************************************************************** + + FileName [fraigApi.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Access APIs for the FRAIG manager and node.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigApi.c,v 1.2 2005/07/08 01:01:30 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Access functions to read the data members of the manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_ManReadVecInputs( Fraig_Man_t * p ) { return p->vInputs; } +Fraig_NodeVec_t * Fraig_ManReadVecOutputs( Fraig_Man_t * p ) { return p->vOutputs; } +Fraig_NodeVec_t * Fraig_ManReadVecNodes( Fraig_Man_t * p ) { return p->vNodes; } +Fraig_Node_t ** Fraig_ManReadInputs ( Fraig_Man_t * p ) { return p->vInputs->pArray; } +Fraig_Node_t ** Fraig_ManReadOutputs( Fraig_Man_t * p ) { return p->vOutputs->pArray; } +Fraig_Node_t ** Fraig_ManReadNodes( Fraig_Man_t * p ) { return p->vNodes->pArray; } +int Fraig_ManReadInputNum ( Fraig_Man_t * p ) { return p->vInputs->nSize; } +int Fraig_ManReadOutputNum( Fraig_Man_t * p ) { return p->vOutputs->nSize; } +int Fraig_ManReadNodeNum( Fraig_Man_t * p ) { return p->vNodes->nSize; } +Fraig_Node_t * Fraig_ManReadConst1 ( Fraig_Man_t * p ) { return p->pConst1; } +Fraig_Node_t * Fraig_ManReadIthNode( Fraig_Man_t * p, int i ) { assert ( i < p->vNodes->nSize ); return p->vNodes->pArray[i]; } +char ** Fraig_ManReadInputNames( Fraig_Man_t * p ) { return p->ppInputNames; } +char ** Fraig_ManReadOutputNames( Fraig_Man_t * p ) { return p->ppOutputNames; } +char * Fraig_ManReadVarsInt( Fraig_Man_t * p ) { return (char *)p->vVarsInt; } +char * Fraig_ManReadSat( Fraig_Man_t * p ) { return (char *)p->pSat; } +int Fraig_ManReadFuncRed( Fraig_Man_t * p ) { return p->fFuncRed; } +int Fraig_ManReadFeedBack( Fraig_Man_t * p ) { return p->fFeedBack; } +int Fraig_ManReadDoSparse( Fraig_Man_t * p ) { return p->fDoSparse; } +int Fraig_ManReadChoicing( Fraig_Man_t * p ) { return p->fChoicing; } +int Fraig_ManReadVerbose( Fraig_Man_t * p ) { return p->fVerbose; } +int * Fraig_ManReadModel( Fraig_Man_t * p ) { return p->pModel; } +// returns the number of patterns used for random simulation (this number is fixed for the FRAIG run) +int Fraig_ManReadPatternNumRandom( Fraig_Man_t * p ) { return p->nWordsRand * 32; } +// returns the number of dynamic patterns accumulated at runtime (include SAT solver counter-examples and distance-1 patterns derived from them) +int Fraig_ManReadPatternNumDynamic( Fraig_Man_t * p ) { return p->iWordStart * 32; } +// returns the number of dynamic patterns proved useful to distinquish some FRAIG nodes (this number is more than 0 after the first garbage collection of patterns) +int Fraig_ManReadPatternNumDynamicFiltered( Fraig_Man_t * p ) { return p->iPatsPerm; } +// returns the number of times FRAIG package timed out +int Fraig_ManReadSatFails( Fraig_Man_t * p ) { return p->nSatFailsReal; } +// returns the number of conflicts in the SAT solver +int Fraig_ManReadConflicts( Fraig_Man_t * p ) { return p->pSat? Msat_SolverReadBackTracks(p->pSat) : 0; } +// returns the number of inspections in the SAT solver +int Fraig_ManReadInspects( Fraig_Man_t * p ) { return p->pSat? Msat_SolverReadInspects(p->pSat) : 0; } + +/**Function************************************************************* + + Synopsis [Access functions to set the data members of the manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManSetFuncRed( Fraig_Man_t * p, int fFuncRed ) { p->fFuncRed = fFuncRed; } +void Fraig_ManSetFeedBack( Fraig_Man_t * p, int fFeedBack ) { p->fFeedBack = fFeedBack; } +void Fraig_ManSetDoSparse( Fraig_Man_t * p, int fDoSparse ) { p->fDoSparse = fDoSparse; } +void Fraig_ManSetChoicing( Fraig_Man_t * p, int fChoicing ) { p->fChoicing = fChoicing; } +void Fraig_ManSetTryProve( Fraig_Man_t * p, int fTryProve ) { p->fTryProve = fTryProve; } +void Fraig_ManSetVerbose( Fraig_Man_t * p, int fVerbose ) { p->fVerbose = fVerbose; } +void Fraig_ManSetTimeToGraph( Fraig_Man_t * p, int Time ) { p->timeToAig = Time; } +void Fraig_ManSetTimeToNet( Fraig_Man_t * p, int Time ) { p->timeToNet = Time; } +void Fraig_ManSetTimeTotal( Fraig_Man_t * p, int Time ) { p->timeTotal = Time; } +void Fraig_ManSetOutputNames( Fraig_Man_t * p, char ** ppNames ) { p->ppOutputNames = ppNames; } +void Fraig_ManSetInputNames( Fraig_Man_t * p, char ** ppNames ) { p->ppInputNames = ppNames; } + +/**Function************************************************************* + + Synopsis [Access functions to read the data members of the node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeReadData0( Fraig_Node_t * p ) { return p->pData0; } +Fraig_Node_t * Fraig_NodeReadData1( Fraig_Node_t * p ) { return p->pData1; } +int Fraig_NodeReadNum( Fraig_Node_t * p ) { return p->Num; } +Fraig_Node_t * Fraig_NodeReadOne( Fraig_Node_t * p ) { assert (!Fraig_IsComplement(p)); return p->p1; } +Fraig_Node_t * Fraig_NodeReadTwo( Fraig_Node_t * p ) { assert (!Fraig_IsComplement(p)); return p->p2; } +Fraig_Node_t * Fraig_NodeReadNextE( Fraig_Node_t * p ) { return p->pNextE; } +Fraig_Node_t * Fraig_NodeReadRepr( Fraig_Node_t * p ) { return p->pRepr; } +int Fraig_NodeReadNumRefs( Fraig_Node_t * p ) { return p->nRefs; } +int Fraig_NodeReadNumFanouts( Fraig_Node_t * p ) { return p->nFanouts; } +int Fraig_NodeReadSimInv( Fraig_Node_t * p ) { return p->fInv; } +int Fraig_NodeReadNumOnes( Fraig_Node_t * p ) { return p->nOnes; } +// returns the pointer to the random simulation patterns (their number is returned by Fraig_ManReadPatternNumRandom) +// memory pointed to by this and the following procedure is maintained by the FRAIG package and exists as long as the package runs +unsigned * Fraig_NodeReadPatternsRandom( Fraig_Node_t * p ) { return p->puSimR; } +// returns the pointer to the dynamic simulation patterns (their number is returned by Fraig_ManReadPatternNumDynamic or Fraig_ManReadPatternNumDynamicFiltered) +// if the number of patterns is not evenly divisible by 32, the patterns beyond the given number contain garbage +unsigned * Fraig_NodeReadPatternsDynamic( Fraig_Node_t * p ) { return p->puSimD; } + +/**Function************************************************************* + + Synopsis [Access functions to set the data members of the node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeSetData0( Fraig_Node_t * p, Fraig_Node_t * pData ) { p->pData0 = pData; } +void Fraig_NodeSetData1( Fraig_Node_t * p, Fraig_Node_t * pData ) { p->pData1 = pData; } + +/**Function************************************************************* + + Synopsis [Checks the type of the node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsConst( Fraig_Node_t * p ) { return (Fraig_Regular(p))->Num == 0; } +int Fraig_NodeIsVar( Fraig_Node_t * p ) { return (Fraig_Regular(p))->NumPi >= 0; } +int Fraig_NodeIsAnd( Fraig_Node_t * p ) { return (Fraig_Regular(p))->NumPi < 0 && (Fraig_Regular(p))->Num > 0; } +int Fraig_NodeComparePhase( Fraig_Node_t * p1, Fraig_Node_t * p2 ) { assert( !Fraig_IsComplement(p1) ); assert( !Fraig_IsComplement(p2) ); return p1->fInv ^ p2->fInv; } + +/**Function************************************************************* + + Synopsis [Returns a new primary input node.] + + Description [If the node with this number does not exist, + create a new PI node with this number.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_ManReadIthVar( Fraig_Man_t * p, int i ) +{ + int k; + if ( i < 0 ) + { + printf( "Requesting a PI with a negative number\n" ); + return NULL; + } + // create the PIs to fill in the interval + if ( i >= p->vInputs->nSize ) + for ( k = p->vInputs->nSize; k <= i; k++ ) + Fraig_NodeCreatePi( p ); + return p->vInputs->pArray[i]; +} + +/**Function************************************************************* + + Synopsis [Creates a new PO node.] + + Description [This procedure may take a complemented node.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManSetPo( Fraig_Man_t * p, Fraig_Node_t * pNode ) +{ + // internal node may be a PO two times + Fraig_Regular(pNode)->fNodePo = 1; + Fraig_NodeVecPush( p->vOutputs, pNode ); +} + +/**Function************************************************************* + + Synopsis [Perfoms the AND operation with functional hashing.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeAnd( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ) +{ + return Fraig_NodeAndCanon( p, p1, p2 ); +} + +/**Function************************************************************* + + Synopsis [Perfoms the OR operation with functional hashing.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeOr( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ) +{ + return Fraig_Not( Fraig_NodeAndCanon( p, Fraig_Not(p1), Fraig_Not(p2) ) ); +} + +/**Function************************************************************* + + Synopsis [Perfoms the EXOR operation with functional hashing.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeExor( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ) +{ + return Fraig_NodeMux( p, p1, Fraig_Not(p2), p2 ); +} + +/**Function************************************************************* + + Synopsis [Perfoms the MUX operation with functional hashing.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeMux( Fraig_Man_t * p, Fraig_Node_t * pC, Fraig_Node_t * pT, Fraig_Node_t * pE ) +{ + Fraig_Node_t * pAnd1, * pAnd2, * pRes; + pAnd1 = Fraig_NodeAndCanon( p, pC, pT ); Fraig_Ref( pAnd1 ); + pAnd2 = Fraig_NodeAndCanon( p, Fraig_Not(pC), pE ); Fraig_Ref( pAnd2 ); + pRes = Fraig_NodeOr( p, pAnd1, pAnd2 ); + Fraig_RecursiveDeref( p, pAnd1 ); + Fraig_RecursiveDeref( p, pAnd2 ); + Fraig_Deref( pRes ); + return pRes; +} + + +/**Function************************************************************* + + Synopsis [Sets the node to be equivalent to the given one.] + + Description [This procedure is a work-around for the equivalence check. + Does not verify the equivalence. Use at the user's risk.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeSetChoice( Fraig_Man_t * pMan, Fraig_Node_t * pNodeOld, Fraig_Node_t * pNodeNew ) +{ +// assert( pMan->fChoicing ); + pNodeNew->pNextE = pNodeOld->pNextE; + pNodeOld->pNextE = pNodeNew; + pNodeNew->pRepr = pNodeOld; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigCanon.c b/src/sat/fraig/fraigCanon.c new file mode 100644 index 00000000..89bc924f --- /dev/null +++ b/src/sat/fraig/fraigCanon.c @@ -0,0 +1,218 @@ +/**CFile**************************************************************** + + FileName [fraigCanon.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [AND-node creation and elementary AND-operation.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigCanon.c,v 1.4 2005/07/08 01:01:31 alanmi Exp $] + +***********************************************************************/ + +#include <limits.h> +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [The internal AND operation for the two FRAIG nodes.] + + Description [This procedure is the core of the FRAIG package, because + it performs the two-step canonicization of FRAIG nodes. The first step + involves the lookup in the structural hash table (which hashes two ANDs + into a node that has them as fanins, if such a node exists). If the node + is not found in the structural hash table, an attempt is made to find a + functionally equivalent node in another hash table (which hashes the + simulation info into the nodes, which has this simulation info). Some + tricks used on the way are described in the comments to the code and + in the paper "FRAIGs: Functionally reduced AND-INV graphs".] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeAndCanon( Fraig_Man_t * pMan, Fraig_Node_t * p1, Fraig_Node_t * p2 ) +{ + Fraig_Node_t * pNodeNew, * pNodeOld, * pNodeRepr; + int fUseSatCheck; +// int RetValue; + + // check for trivial cases + if ( p1 == p2 ) + return p1; + if ( p1 == Fraig_Not(p2) ) + return Fraig_Not(pMan->pConst1); + if ( Fraig_NodeIsConst(p1) ) + { + if ( p1 == pMan->pConst1 ) + return p2; + return Fraig_Not(pMan->pConst1); + } + if ( Fraig_NodeIsConst(p2) ) + { + if ( p2 == pMan->pConst1 ) + return p1; + return Fraig_Not(pMan->pConst1); + } +/* + // check for less trivial cases + if ( Fraig_IsComplement(p1) ) + { + if ( RetValue = Fraig_NodeIsInSupergate( Fraig_Regular(p1), p2 ) ) + { + if ( RetValue == -1 ) + pMan->nImplies0++; + else + pMan->nImplies1++; + + if ( RetValue == -1 ) + return p2; + } + } + else + { + if ( RetValue = Fraig_NodeIsInSupergate( p1, p2 ) ) + { + if ( RetValue == 1 ) + pMan->nSimplifies1++; + else + pMan->nSimplifies0++; + + if ( RetValue == 1 ) + return p1; + return Fraig_Not(pMan->pConst1); + } + } + + if ( Fraig_IsComplement(p2) ) + { + if ( RetValue = Fraig_NodeIsInSupergate( Fraig_Regular(p2), p1 ) ) + { + if ( RetValue == -1 ) + pMan->nImplies0++; + else + pMan->nImplies1++; + + if ( RetValue == -1 ) + return p1; + } + } + else + { + if ( RetValue = Fraig_NodeIsInSupergate( p2, p1 ) ) + { + if ( RetValue == 1 ) + pMan->nSimplifies1++; + else + pMan->nSimplifies0++; + + if ( RetValue == 1 ) + return p2; + return Fraig_Not(pMan->pConst1); + } + } +*/ + // perform level-one structural hashing + if ( Fraig_HashTableLookupS( pMan, p1, p2, &pNodeNew ) ) // the node with these children is found + { + // if the existent node is part of the cone of unused logic + // (that is logic feeding the node which is equivalent to the given node) + // return the canonical representative of this node + // determine the phase of the given node, with respect to its canonical form + pNodeRepr = Fraig_Regular(pNodeNew)->pRepr; + if ( pMan->fFuncRed && pNodeRepr ) + return Fraig_NotCond( pNodeRepr, Fraig_IsComplement(pNodeNew) ^ Fraig_NodeComparePhase(Fraig_Regular(pNodeNew), pNodeRepr) ); + // otherwise, the node is itself a canonical representative, return it + return pNodeNew; + } + // the same node is not found, but the new one is created + + // if one level hashing is requested (without functionality hashing), return + if ( !pMan->fFuncRed ) + return pNodeNew; + + // check if the new node is unique using the simulation info + if ( pNodeNew->nOnes == 0 || pNodeNew->nOnes == (unsigned)pMan->nWordsRand * 32 ) + { + pMan->nSatZeros++; + if ( !pMan->fDoSparse ) // if we do not do sparse functions, skip + return pNodeNew; + // check the sparse function simulation hash table + pNodeOld = Fraig_HashTableLookupF0( pMan, pNodeNew ); + if ( pNodeOld == NULL ) // the node is unique (it is added to the table) + return pNodeNew; + } + else + { + // check the simulation hash table + pNodeOld = Fraig_HashTableLookupF( pMan, pNodeNew ); + if ( pNodeOld == NULL ) // the node is unique + return pNodeNew; + } + assert( pNodeOld->pRepr == 0 ); + // there is another node which looks the same according to simulation + + // use SAT to resolve the ambiguity + fUseSatCheck = (pMan->nInspLimit == 0 || Fraig_ManReadInspects(pMan) < pMan->nInspLimit); + if ( fUseSatCheck && Fraig_NodeIsEquivalent( pMan, pNodeOld, pNodeNew, pMan->nBTLimit, 1000000 ) ) + { + // set the node to be equivalent with this node + // to prevent loops, only set if the old node is not in the TFI of the new node + // the loop may happen in the following case: suppose + // NodeC = AND(NodeA, NodeB) and at the same time NodeA => NodeB + // in this case, NodeA and NodeC are functionally equivalent + // however, NodeA is a fanin of node NodeC (this leads to the loop) + // add the node to the list of equivalent nodes or dereference it + if ( pMan->fChoicing && !Fraig_CheckTfi( pMan, pNodeOld, pNodeNew ) ) + { + // if the old node is not in the TFI of the new node and choicing + // is enabled, add the new node to the list of equivalent ones + pNodeNew->pNextE = pNodeOld->pNextE; + pNodeOld->pNextE = pNodeNew; + } + // set the canonical representative of this node + pNodeNew->pRepr = pNodeOld; + // return the equivalent node + return Fraig_NotCond( pNodeOld, Fraig_NodeComparePhase(pNodeOld, pNodeNew) ); + } + + // now we add another member to this simulation class + if ( pNodeNew->nOnes == 0 || pNodeNew->nOnes == (unsigned)pMan->nWordsRand * 32 ) + { + Fraig_Node_t * pNodeTemp; + assert( pMan->fDoSparse ); + pNodeTemp = Fraig_HashTableLookupF0( pMan, pNodeNew ); +// assert( pNodeTemp == NULL ); +// Fraig_HashTableInsertF0( pMan, pNodeNew ); + } + else + { + pNodeNew->pNextD = pNodeOld->pNextD; + pNodeOld->pNextD = pNodeNew; + } + // return the new node + assert( pNodeNew->pRepr == 0 ); + return pNodeNew; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigChoice.c b/src/sat/fraig/fraigChoice.c new file mode 100644 index 00000000..896e5d2d --- /dev/null +++ b/src/sat/fraig/fraigChoice.c @@ -0,0 +1,241 @@ +/**CFile**************************************************************** + + FileName [fraigTrans.c] + + PackageName [MVSIS 1.3: Multi-valued logic synthesis system.] + + Synopsis [Adds the additive and distributive choices to the AIG.] + + Author [MVSIS Group] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - February 1, 2003.] + + Revision [$Id: fraigTrans.c,v 1.1 2005/02/28 05:34:34 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Adds choice nodes based on associativity.] + + Description [Make nLimit big AND gates and add all decompositions + to the Fraig.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManAddChoices( Fraig_Man_t * pMan, int fVerbose, int nLimit ) +{ +// ProgressBar * pProgress; + char Buffer[100]; + int clkTotal = clock(); + int i, nNodesBefore, nNodesAfter, nInputs, nMaxNodes; + int /*nMaxLevel,*/ nDistributive; + Fraig_Node_t *pNode, *pRepr; + Fraig_Node_t *pX, *pA, *pB, *pC, /* *pD,*/ *pN, /* *pQ, *pR,*/ *pT; + int fShortCut = 0; + + nDistributive = 0; + +// Fraig_ManSetApprox( pMan, 1 ); + + // NO functional reduction + if (fShortCut) Fraig_ManSetFuncRed( pMan, 0 ); + + // First we mark critical functions i.e. compute those + // nodes which lie on the critical path. Note that this + // doesn't update the required times on any choice nodes + // which are not the representatives +/* + nMaxLevel = Fraig_GetMaxLevel( pMan ); + for ( i = 0; i < pMan->nOutputs; i++ ) + { + Fraig_SetNodeRequired( pMan, pMan->pOutputs[i], nMaxLevel ); + } +*/ + nNodesBefore = Fraig_ManReadNodeNum( pMan ); + nInputs = Fraig_ManReadInputNum( pMan ); + nMaxNodes = nInputs + nLimit * ( nNodesBefore - nInputs ); + + printf ("Limit = %d, Before = %d\n", nMaxNodes, nNodesBefore ); + + if (0) + { + char buffer[128]; + sprintf (buffer, "test" ); +// Fraig_MappingShow( pMan, buffer ); + } + +// pProgress = Extra_ProgressBarStart( stdout, nMaxNodes ); +Fraig_ManCheckConsistency( pMan ); + + for ( i = nInputs+1; (i < Fraig_ManReadNodeNum( pMan )) + && (nMaxNodes > Fraig_ManReadNodeNum( pMan )); ++i ) + { +// if ( i == nNodesBefore ) +// break; + + pNode = Fraig_ManReadIthNode( pMan, i ); + assert ( pNode ); + + pRepr = pNode->pRepr ? pNode->pRepr : pNode; + //printf ("Slack: %d\n", Fraig_NodeReadSlack( pRepr )); + + // All the new associative choices we add will have huge slack + // since we do not redo timing, and timing doesnt handle choices + // well anyway. However every newly added node is a choice of an + // existing critical node, so they are considered critical. +// if ( (Fraig_NodeReadSlack( pRepr ) > 3) && (i < nNodesBefore) ) +// continue; + +// if ( pNode->pRepr ) +// continue; + + // Try ((ab)c), x = ab -> (a(bc)) and (b(ac)) + pX = Fraig_NodeReadOne(pNode); + pC = Fraig_NodeReadTwo(pNode); + if (Fraig_NodeIsAnd(pX) && !Fraig_IsComplement(pX)) + { + pA = Fraig_NodeReadOne(Fraig_Regular(pX)); + pB = Fraig_NodeReadTwo(Fraig_Regular(pX)); + +// pA = Fraig_NodeGetRepr( pA ); +// pB = Fraig_NodeGetRepr( pB ); +// pC = Fraig_NodeGetRepr( pC ); + + if (fShortCut) + { + pT = Fraig_NodeAnd(pMan, pB, pC); + if ( !pT->pRepr ) + { + pN = Fraig_NodeAnd(pMan, pA, pT); +// Fraig_NodeAddChoice( pMan, pNode, pN ); + } + } + else + pN = Fraig_NodeAnd(pMan, pA, Fraig_NodeAnd(pMan, pB, pC)); + // assert ( Fraig_NodesEqual(pN, pNode) ); + + + if (fShortCut) + { + pT = Fraig_NodeAnd(pMan, pA, pC); + if ( !pT->pRepr ) + { + pN = Fraig_NodeAnd(pMan, pB, pT); +// Fraig_NodeAddChoice( pMan, pNode, pN ); + } + } + else + pN = Fraig_NodeAnd(pMan, pB, Fraig_NodeAnd(pMan, pA, pC)); + // assert ( Fraig_NodesEqual(pN, pNode) ); + } + + + // Try (a(bc)), x = bc -> ((ab)c) and ((ac)b) + pA = Fraig_NodeReadOne(pNode); + pX = Fraig_NodeReadTwo(pNode); + if (Fraig_NodeIsAnd(pX) && !Fraig_IsComplement(pX)) + { + pB = Fraig_NodeReadOne(Fraig_Regular(pX)); + pC = Fraig_NodeReadTwo(Fraig_Regular(pX)); + +// pA = Fraig_NodeGetRepr( pA ); +// pB = Fraig_NodeGetRepr( pB ); +// pC = Fraig_NodeGetRepr( pC ); + + if (fShortCut) + { + pT = Fraig_NodeAnd(pMan, pA, pB); + if ( !pT->pRepr ) + { + pN = Fraig_NodeAnd(pMan, pC, pT); +// Fraig_NodeAddChoice( pMan, pNode, pN ); + } + } + else + pN = Fraig_NodeAnd(pMan, Fraig_NodeAnd(pMan, pA, pB), pC); + // assert ( Fraig_NodesEqual(pN, pNode) ); + + if (fShortCut) + { + pT = Fraig_NodeAnd(pMan, pA, pC); + if ( !pT->pRepr ) + { + pN = Fraig_NodeAnd(pMan, pB, pT); +// Fraig_NodeAddChoice( pMan, pNode, pN ); + } + } + else + pN = Fraig_NodeAnd(pMan, Fraig_NodeAnd(pMan, pA, pC), pB); + // assert ( Fraig_NodesEqual(pN, pNode) ); + } + + +/* + // Try distributive transform + pQ = Fraig_NodeReadOne(pNode); + pR = Fraig_NodeReadTwo(pNode); + if ( (Fraig_IsComplement(pQ) && Fraig_NodeIsAnd(pQ)) + && (Fraig_IsComplement(pR) && Fraig_NodeIsAnd(pR)) ) + { + pA = Fraig_NodeReadOne(Fraig_Regular(pQ)); + pB = Fraig_NodeReadTwo(Fraig_Regular(pQ)); + pC = Fraig_NodeReadOne(Fraig_Regular(pR)); + pD = Fraig_NodeReadTwo(Fraig_Regular(pR)); + + // Now detect the !(xy + xz) pattern, store + // x in pA, y in pB and z in pC and set pD = 0 to indicate + // pattern was found + assert (pD != 0); + if (pA == pC) { pC = pD; pD = 0; } + if (pA == pD) { pD = 0; } + if (pB == pC) { pB = pA; pA = pC; pC = pD; pD = 0; } + if (pB == pD) { pB = pA; pA = pD; pD = 0; } + if (pD == 0) + { + nDistributive++; + pN = Fraig_Not(Fraig_NodeAnd(pMan, pA, + Fraig_NodeOr(pMan, pB, pC))); + if (fShortCut) Fraig_NodeAddChoice( pMan, pNode, pN ); + // assert ( Fraig_NodesEqual(pN, pNode) ); + } + } +*/ + if ( i % 1000 == 0 ) + { + sprintf( Buffer, "Adding choice %6d...", i - nNodesBefore ); +// Extra_ProgressBarUpdate( pProgress, i, Buffer ); + } + } + +// Extra_ProgressBarStop( pProgress ); + +Fraig_ManCheckConsistency( pMan ); + + nNodesAfter = Fraig_ManReadNodeNum( pMan ); + printf ( "Nodes before = %6d. Nodes with associative choices = %6d. Increase = %4.2f %%.\n", + nNodesBefore, nNodesAfter, ((float)(nNodesAfter - nNodesBefore)) * 100.0/(nNodesBefore - nInputs) ); + printf ( "Distributive = %d\n", nDistributive ); + +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigFanout.c b/src/sat/fraig/fraigFanout.c new file mode 100644 index 00000000..789bffca --- /dev/null +++ b/src/sat/fraig/fraigFanout.c @@ -0,0 +1,175 @@ +/**CFile**************************************************************** + + FileName [fraigFanout.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Procedures to manipulate fanouts of the FRAIG nodes.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigFanout.c,v 1.5 2005/07/08 01:01:31 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +#ifdef FRAIG_ENABLE_FANOUTS + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Add the fanout to the node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeAddFaninFanout( Fraig_Node_t * pFanin, Fraig_Node_t * pFanout ) +{ + Fraig_Node_t * pPivot; + + // pFanins is a fanin of pFanout + assert( !Fraig_IsComplement(pFanin) ); + assert( !Fraig_IsComplement(pFanout) ); + assert( Fraig_Regular(pFanout->p1) == pFanin || Fraig_Regular(pFanout->p2) == pFanin ); + + pPivot = pFanin->pFanPivot; + if ( pPivot == NULL ) + { + pFanin->pFanPivot = pFanout; + return; + } + + if ( Fraig_Regular(pPivot->p1) == pFanin ) + { + if ( Fraig_Regular(pFanout->p1) == pFanin ) + { + pFanout->pFanFanin1 = pPivot->pFanFanin1; + pPivot->pFanFanin1 = pFanout; + } + else // if ( Fraig_Regular(pFanout->p2) == pFanin ) + { + pFanout->pFanFanin2 = pPivot->pFanFanin1; + pPivot->pFanFanin1 = pFanout; + } + } + else // if ( Fraig_Regular(pPivot->p2) == pFanin ) + { + assert( Fraig_Regular(pPivot->p2) == pFanin ); + if ( Fraig_Regular(pFanout->p1) == pFanin ) + { + pFanout->pFanFanin1 = pPivot->pFanFanin2; + pPivot->pFanFanin2 = pFanout; + } + else // if ( Fraig_Regular(pFanout->p2) == pFanin ) + { + pFanout->pFanFanin2 = pPivot->pFanFanin2; + pPivot->pFanFanin2 = pFanout; + } + } +} + +/**Function************************************************************* + + Synopsis [Add the fanout to the node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeRemoveFaninFanout( Fraig_Node_t * pFanin, Fraig_Node_t * pFanoutToRemove ) +{ + Fraig_Node_t * pFanout, * pFanout2, ** ppFanList; + // start the linked list of fanouts + ppFanList = &pFanin->pFanPivot; + // go through the fanouts + Fraig_NodeForEachFanoutSafe( pFanin, pFanout, pFanout2 ) + { + // skip the fanout-to-remove + if ( pFanout == pFanoutToRemove ) + continue; + // add useful fanouts to the list + *ppFanList = pFanout; + ppFanList = Fraig_NodeReadNextFanoutPlace( pFanin, pFanout ); + } + *ppFanList = NULL; +} + +/**Function************************************************************* + + Synopsis [Transfers fanout to a different node.] + + Description [Assumes that the other node currently has no fanouts.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeTransferFanout( Fraig_Node_t * pNodeFrom, Fraig_Node_t * pNodeTo ) +{ + Fraig_Node_t * pFanout; + assert( pNodeTo->pFanPivot == NULL ); + assert( pNodeTo->pFanFanin1 == NULL ); + assert( pNodeTo->pFanFanin2 == NULL ); + // go through the fanouts and update their fanins + Fraig_NodeForEachFanout( pNodeFrom, pFanout ) + { + if ( Fraig_Regular(pFanout->p1) == pNodeFrom ) + pFanout->p1 = Fraig_NotCond( pNodeTo, Fraig_IsComplement(pFanout->p1) ); + else if ( Fraig_Regular(pFanout->p2) == pNodeFrom ) + pFanout->p2 = Fraig_NotCond( pNodeTo, Fraig_IsComplement(pFanout->p2) ); + } + // move the pointers + pNodeTo->pFanPivot = pNodeFrom->pFanPivot; + pNodeTo->pFanFanin1 = pNodeFrom->pFanFanin1; + pNodeTo->pFanFanin2 = pNodeFrom->pFanFanin2; + pNodeFrom->pFanPivot = NULL; + pNodeFrom->pFanFanin1 = NULL; + pNodeFrom->pFanFanin2 = NULL; +} + +/**Function************************************************************* + + Synopsis [Returns the number of fanouts of a node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeGetFanoutNum( Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pFanout; + int Counter = 0; + Fraig_NodeForEachFanout( pNode, pFanout ) + Counter++; + return Counter; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + +#endif + diff --git a/src/sat/fraig/fraigFeed.c b/src/sat/fraig/fraigFeed.c new file mode 100644 index 00000000..8a3cc6c7 --- /dev/null +++ b/src/sat/fraig/fraigFeed.c @@ -0,0 +1,909 @@ +/**CFile**************************************************************** + + FileName [fraigFeed.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Procedures to support the solver feedback.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigFeed.c,v 1.8 2005/07/08 01:01:31 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static int Fraig_FeedBackPrepare( Fraig_Man_t * p, int * pModel, Msat_IntVec_t * vVars ); +static int Fraig_FeedBackInsert( Fraig_Man_t * p, int nVarsPi ); +static void Fraig_FeedBackVerify( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew ); + +static void Fraig_FeedBackCovering( Fraig_Man_t * p, Msat_IntVec_t * vPats ); +static Fraig_NodeVec_t * Fraig_FeedBackCoveringStart( Fraig_Man_t * pMan ); +static int Fraig_GetSmallestColumn( int * pHits, int nHits ); +static int Fraig_GetHittingPattern( unsigned * pSims, int nWords ); +static void Fraig_CancelCoveredColumns( Fraig_NodeVec_t * vColumns, int * pHits, int iPat ); +static void Fraig_FeedBackCheckTable( Fraig_Man_t * p ); +static void Fraig_FeedBackCheckTableF0( Fraig_Man_t * p ); +static void Fraig_ReallocateSimulationInfo( Fraig_Man_t * p ); + + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Initializes the feedback information.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_FeedBackInit( Fraig_Man_t * p ) +{ + p->vCones = Fraig_NodeVecAlloc( 500 ); + p->vPatsReal = Msat_IntVecAlloc( 1000 ); + p->pSimsReal = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims ); + memset( p->pSimsReal, 0, sizeof(unsigned) * p->nWordsDyna ); + p->pSimsTemp = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims ); + p->pSimsDiff = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims ); +} + +/**Function************************************************************* + + Synopsis [Processes the feedback from teh solver.] + + Description [Array pModel gives the value of each variable in the SAT + solver. Array vVars is the array of integer numbers of variables + involves in this conflict.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_FeedBack( Fraig_Man_t * p, int * pModel, Msat_IntVec_t * vVars, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ + int nVarsPi, nWords; + int i, clk = clock(); + + // get the number of PI vars in the feedback (also sets the PI values) + nVarsPi = Fraig_FeedBackPrepare( p, pModel, vVars ); + + // set the PI values + nWords = Fraig_FeedBackInsert( p, nVarsPi ); + assert( p->iWordStart + nWords <= p->nWordsDyna ); + + // resimulates the words from p->iWordStart to iWordStop + for ( i = 1; i < p->vNodes->nSize; i++ ) + if ( Fraig_NodeIsAnd(p->vNodes->pArray[i]) ) + Fraig_NodeSimulate( p->vNodes->pArray[i], p->iWordStart, p->iWordStart + nWords, 0 ); + + if ( p->fDoSparse ) + Fraig_TableRehashF0( p, 0 ); + + if ( !p->fChoicing ) + Fraig_FeedBackVerify( p, pOld, pNew ); + + // if there is no room left, compress the patterns + if ( p->iWordStart + nWords == p->nWordsDyna ) + p->iWordStart = Fraig_FeedBackCompress( p ); + else // otherwise, update the starting word + p->iWordStart += nWords; + +p->timeFeed += clock() - clk; +} + +/**Function************************************************************* + + Synopsis [Get the number and values of the PI variables.] + + Description [Returns the number of PI variables involved in this feedback. + Fills in the internal presence and value data for the primary inputs.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_FeedBackPrepare( Fraig_Man_t * p, int * pModel, Msat_IntVec_t * vVars ) +{ + Fraig_Node_t * pNode; + int i, nVars, nVarsPis, * pVars; + + // clean the presence flag for all PIs + for ( i = 0; i < p->vInputs->nSize; i++ ) + { + pNode = p->vInputs->pArray[i]; + pNode->fFeedUse = 0; + } + + // get the variables involved in the feedback + nVars = Msat_IntVecReadSize(vVars); + pVars = Msat_IntVecReadArray(vVars); + + // set the values for the present variables + nVarsPis = 0; + for ( i = 0; i < nVars; i++ ) + { + pNode = p->vNodes->pArray[ pVars[i] ]; + if ( !Fraig_NodeIsVar(pNode) ) + continue; + // set its value + pNode->fFeedUse = 1; + pNode->fFeedVal = !MSAT_LITSIGN(pModel[pVars[i]]); + nVarsPis++; + } + return nVarsPis; +} + +/**Function************************************************************* + + Synopsis [Inserts the new simulation patterns.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_FeedBackInsert( Fraig_Man_t * p, int nVarsPi ) +{ + Fraig_Node_t * pNode; + int nWords, iPatFlip, nPatFlipLimit, i, w; + int fUseNoPats = 0; + int fUse2Pats = 0; + + // get the number of words + if ( fUse2Pats ) + nWords = FRAIG_NUM_WORDS( 2 * nVarsPi + 1 ); + else if ( fUseNoPats ) + nWords = 1; + else + nWords = FRAIG_NUM_WORDS( nVarsPi + 1 ); + // update the number of words if they do not fit into the simulation info + if ( nWords > p->nWordsDyna - p->iWordStart ) + nWords = p->nWordsDyna - p->iWordStart; + // determine the bound on the flipping bit + nPatFlipLimit = nWords * 32 - 2; + + // mark the real pattern + Msat_IntVecPush( p->vPatsReal, p->iWordStart * 32 ); + // record the real pattern + Fraig_BitStringSetBit( p->pSimsReal, p->iWordStart * 32 ); + + // set the values at the PIs + iPatFlip = 1; + for ( i = 0; i < p->vInputs->nSize; i++ ) + { + pNode = p->vInputs->pArray[i]; + for ( w = p->iWordStart; w < p->iWordStart + nWords; w++ ) + if ( !pNode->fFeedUse ) + pNode->puSimD[w] = FRAIG_RANDOM_UNSIGNED; + else if ( pNode->fFeedVal ) + pNode->puSimD[w] = FRAIG_FULL; + else // if ( !pNode->fFeedVal ) + pNode->puSimD[w] = 0; + + if ( fUse2Pats ) + { + // flip two patterns + if ( pNode->fFeedUse && 2 * iPatFlip < nPatFlipLimit ) + { + Fraig_BitStringXorBit( pNode->puSimD + p->iWordStart, 2 * iPatFlip - 1 ); + Fraig_BitStringXorBit( pNode->puSimD + p->iWordStart, 2 * iPatFlip ); + Fraig_BitStringXorBit( pNode->puSimD + p->iWordStart, 2 * iPatFlip + 1 ); + iPatFlip++; + } + } + else if ( fUseNoPats ) + { + } + else + { + // flip the diagonal + if ( pNode->fFeedUse && iPatFlip < nPatFlipLimit ) + { + Fraig_BitStringXorBit( pNode->puSimD + p->iWordStart, iPatFlip ); + iPatFlip++; + // Extra_PrintBinary( stdout, &pNode->puSimD, 45 ); printf( "\n" ); + } + } + // clean the use mask + pNode->fFeedUse = 0; + + // add the info to the D hash value of the PIs + for ( w = p->iWordStart; w < p->iWordStart + nWords; w++ ) + pNode->uHashD ^= pNode->puSimD[w] * s_FraigPrimes[w]; + + } + return nWords; +} + + +/**Function************************************************************* + + Synopsis [Checks that the SAT solver pattern indeed distinquishes the nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_FeedBackVerify( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ + int fValue1, fValue2, iPat; + iPat = Msat_IntVecReadEntry( p->vPatsReal, Msat_IntVecReadSize(p->vPatsReal)-1 ); + fValue1 = (Fraig_BitStringHasBit( pOld->puSimD, iPat )); + fValue2 = (Fraig_BitStringHasBit( pNew->puSimD, iPat )); +/* +Fraig_PrintNode( p, pOld ); +printf( "\n" ); +Fraig_PrintNode( p, pNew ); +printf( "\n" ); +*/ +// assert( fValue1 != fValue2 ); +} + +/**Function************************************************************* + + Synopsis [Compress the simulation patterns.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_FeedBackCompress( Fraig_Man_t * p ) +{ + unsigned * pSims; + unsigned uHash; + int i, w, t, nPats, * pPats; + int fPerformChecks = (p->nBTLimit == -1); + + // solve the covering problem + if ( fPerformChecks ) + { + Fraig_FeedBackCheckTable( p ); + if ( p->fDoSparse ) + Fraig_FeedBackCheckTableF0( p ); + } + + // solve the covering problem + Fraig_FeedBackCovering( p, p->vPatsReal ); + + + // get the number of additional patterns + nPats = Msat_IntVecReadSize( p->vPatsReal ); + pPats = Msat_IntVecReadArray( p->vPatsReal ); + // get the new starting word + p->iWordStart = FRAIG_NUM_WORDS( p->iPatsPerm + nPats ); + + // set the simulation info for the PIs + for ( i = 0; i < p->vInputs->nSize; i++ ) + { + // get hold of the simulation info for this PI + pSims = p->vInputs->pArray[i]->puSimD; + // clean the storage for the new patterns + for ( w = p->iWordPerm; w < p->iWordStart; w++ ) + p->pSimsTemp[w] = 0; + // set the patterns + for ( t = 0; t < nPats; t++ ) + if ( Fraig_BitStringHasBit( pSims, pPats[t] ) ) + { + // check if this pattern falls into temporary storage + if ( p->iPatsPerm + t < p->iWordPerm * 32 ) + Fraig_BitStringSetBit( pSims, p->iPatsPerm + t ); + else + Fraig_BitStringSetBit( p->pSimsTemp, p->iPatsPerm + t ); + } + // copy the pattern + for ( w = p->iWordPerm; w < p->iWordStart; w++ ) + pSims[w] = p->pSimsTemp[w]; + // recompute the hashing info + uHash = 0; + for ( w = 0; w < p->iWordStart; w++ ) + uHash ^= pSims[w] * s_FraigPrimes[w]; + p->vInputs->pArray[i]->uHashD = uHash; + } + + // update info about the permanently stored patterns + p->iWordPerm = p->iWordStart; + p->iPatsPerm += nPats; + assert( p->iWordPerm == FRAIG_NUM_WORDS( p->iPatsPerm ) ); + + // resimulate and recompute the hash values + for ( i = 1; i < p->vNodes->nSize; i++ ) + if ( Fraig_NodeIsAnd(p->vNodes->pArray[i]) ) + { + p->vNodes->pArray[i]->uHashD = 0; + Fraig_NodeSimulate( p->vNodes->pArray[i], 0, p->iWordPerm, 0 ); + } + + // double-check that the nodes are still distinguished + if ( fPerformChecks ) + Fraig_FeedBackCheckTable( p ); + + // rehash the values in the F0 table + if ( p->fDoSparse ) + { + Fraig_TableRehashF0( p, 0 ); + if ( fPerformChecks ) + Fraig_FeedBackCheckTableF0( p ); + } + + // check if we need to resize the simulation info + // if less than FRAIG_WORDS_STORE words are left, reallocate simulation info + if ( p->iWordPerm + FRAIG_WORDS_STORE > p->nWordsDyna ) + Fraig_ReallocateSimulationInfo( p ); + + // set the real patterns + Msat_IntVecClear( p->vPatsReal ); + memset( p->pSimsReal, 0, sizeof(unsigned)*p->nWordsDyna ); + for ( w = 0; w < p->iWordPerm; w++ ) + p->pSimsReal[w] = FRAIG_FULL; + if ( p->iPatsPerm % 32 > 0 ) + p->pSimsReal[p->iWordPerm-1] = FRAIG_MASK( p->iPatsPerm % 32 ); +// printf( "The number of permanent words = %d.\n", p->iWordPerm ); + return p->iWordStart; +} + + + + +/**Function************************************************************* + + Synopsis [Checks the correctness of the functional simulation table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_FeedBackCovering( Fraig_Man_t * p, Msat_IntVec_t * vPats ) +{ + Fraig_NodeVec_t * vColumns; + unsigned * pSims; + int * pHits, iPat, iCol, i; + int nOnesTotal, nSolStarting; + int fVeryVerbose = 0; + + // collect the pairs to be distinguished + vColumns = Fraig_FeedBackCoveringStart( p ); + // collect the number of 1s in each simulation vector + nOnesTotal = 0; + pHits = ALLOC( int, vColumns->nSize ); + for ( i = 0; i < vColumns->nSize; i++ ) + { + pSims = (unsigned *)vColumns->pArray[i]; + pHits[i] = Fraig_BitStringCountOnes( pSims, p->iWordStart ); + nOnesTotal += pHits[i]; +// assert( pHits[i] > 0 ); + } + + // go through the patterns + nSolStarting = Msat_IntVecReadSize(vPats); + while ( (iCol = Fraig_GetSmallestColumn( pHits, vColumns->nSize )) != -1 ) + { + // find the pattern, which hits this column + iPat = Fraig_GetHittingPattern( (unsigned *)vColumns->pArray[iCol], p->iWordStart ); + // cancel the columns covered by this pattern + Fraig_CancelCoveredColumns( vColumns, pHits, iPat ); + // save the pattern + Msat_IntVecPush( vPats, iPat ); + } + + // free the set of columns + for ( i = 0; i < vColumns->nSize; i++ ) + Fraig_MemFixedEntryRecycle( p->mmSims, (char *)vColumns->pArray[i] ); + + // print stats related to the covering problem + if ( p->fVerbose && fVeryVerbose ) + { + printf( "%3d\\%3d\\%3d ", p->nWordsRand, p->nWordsDyna, p->iWordPerm ); + printf( "Col (pairs) = %5d. ", vColumns->nSize ); + printf( "Row (pats) = %5d. ", p->iWordStart * 32 ); + printf( "Dns = %6.2f %%. ", vColumns->nSize==0? 0.0 : 100.0 * nOnesTotal / vColumns->nSize / p->iWordStart / 32 ); + printf( "Sol = %3d (%3d). ", Msat_IntVecReadSize(vPats), nSolStarting ); + printf( "\n" ); + } + Fraig_NodeVecFree( vColumns ); + free( pHits ); +} + + +/**Function************************************************************* + + Synopsis [Checks the correctness of the functional simulation table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_FeedBackCoveringStart( Fraig_Man_t * p ) +{ + Fraig_NodeVec_t * vColumns; + Fraig_HashTable_t * pT = p->pTableF; + Fraig_Node_t * pEntF, * pEntD; + unsigned * pSims; + unsigned * pUnsigned1, * pUnsigned2; + int i, k, m, w;//, nOnes; + + // start the set of columns + vColumns = Fraig_NodeVecAlloc( 100 ); + + // go through the pairs of nodes to be distinguished + for ( i = 0; i < pT->nBins; i++ ) + Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF ) + { + p->vCones->nSize = 0; + Fraig_TableBinForEachEntryD( pEntF, pEntD ) + Fraig_NodeVecPush( p->vCones, pEntD ); + if ( p->vCones->nSize == 1 ) + continue; + //////////////////////////////// bug fix by alanmi, September 14, 2006 + if ( p->vCones->nSize > 20 ) + continue; + //////////////////////////////// + + for ( k = 0; k < p->vCones->nSize; k++ ) + for ( m = k+1; m < p->vCones->nSize; m++ ) + { + if ( !Fraig_CompareSimInfoUnderMask( p->vCones->pArray[k], p->vCones->pArray[m], p->iWordStart, 0, p->pSimsReal ) ) + continue; + + // primary simulation patterns (counter-examples) cannot distinguish this pair + // get memory to store the feasible simulation patterns + pSims = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims ); + // find the pattern that distinguish this column, exept the primary ones + pUnsigned1 = p->vCones->pArray[k]->puSimD; + pUnsigned2 = p->vCones->pArray[m]->puSimD; + for ( w = 0; w < p->iWordStart; w++ ) + pSims[w] = (pUnsigned1[w] ^ pUnsigned2[w]) & ~p->pSimsReal[w]; + // store the pattern + Fraig_NodeVecPush( vColumns, (Fraig_Node_t *)pSims ); +// nOnes = Fraig_BitStringCountOnes(pSims, p->iWordStart); +// assert( nOnes > 0 ); + } + } + + // if the flag is not set, do not consider sparse nodes in p->pTableF0 + if ( !p->fDoSparse ) + return vColumns; + + // recalculate their hash values based on p->pSimsReal + pT = p->pTableF0; + for ( i = 0; i < pT->nBins; i++ ) + Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF ) + { + pSims = pEntF->puSimD; + pEntF->uHashD = 0; + for ( w = 0; w < p->iWordStart; w++ ) + pEntF->uHashD ^= (pSims[w] & p->pSimsReal[w]) * s_FraigPrimes[w]; + } + + // rehash the table using these values + Fraig_TableRehashF0( p, 1 ); + + // collect the classes of equivalent node pairs + for ( i = 0; i < pT->nBins; i++ ) + Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF ) + { + p->vCones->nSize = 0; + Fraig_TableBinForEachEntryD( pEntF, pEntD ) + Fraig_NodeVecPush( p->vCones, pEntD ); + if ( p->vCones->nSize == 1 ) + continue; + + // primary simulation patterns (counter-examples) cannot distinguish all these pairs + for ( k = 0; k < p->vCones->nSize; k++ ) + for ( m = k+1; m < p->vCones->nSize; m++ ) + { + // get memory to store the feasible simulation patterns + pSims = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims ); + // find the patterns that are not distinquished + pUnsigned1 = p->vCones->pArray[k]->puSimD; + pUnsigned2 = p->vCones->pArray[m]->puSimD; + for ( w = 0; w < p->iWordStart; w++ ) + pSims[w] = (pUnsigned1[w] ^ pUnsigned2[w]) & ~p->pSimsReal[w]; + // store the pattern + Fraig_NodeVecPush( vColumns, (Fraig_Node_t *)pSims ); +// nOnes = Fraig_BitStringCountOnes(pSims, p->iWordStart); +// assert( nOnes > 0 ); + } + } + return vColumns; +} + +/**Function************************************************************* + + Synopsis [Selects the column, which has the smallest number of hits.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_GetSmallestColumn( int * pHits, int nHits ) +{ + int i, iColMin = -1, nHitsMin = 1000000; + for ( i = 0; i < nHits; i++ ) + { + // skip covered columns + if ( pHits[i] == 0 ) + continue; + // take the column if it can only be covered by one pattern + if ( pHits[i] == 1 ) + return i; + // find the column, which requires the smallest number of patterns + if ( nHitsMin > pHits[i] ) + { + nHitsMin = pHits[i]; + iColMin = i; + } + } + return iColMin; +} + +/**Function************************************************************* + + Synopsis [Select the pattern, which hits this column.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_GetHittingPattern( unsigned * pSims, int nWords ) +{ + int i, b; + for ( i = 0; i < nWords; i++ ) + { + if ( pSims[i] == 0 ) + continue; + for ( b = 0; b < 32; b++ ) + if ( pSims[i] & (1 << b) ) + return i * 32 + b; + } + return -1; +} + +/**Function************************************************************* + + Synopsis [Cancel covered patterns.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_CancelCoveredColumns( Fraig_NodeVec_t * vColumns, int * pHits, int iPat ) +{ + unsigned * pSims; + int i; + for ( i = 0; i < vColumns->nSize; i++ ) + { + pSims = (unsigned *)vColumns->pArray[i]; + if ( Fraig_BitStringHasBit( pSims, iPat ) ) + pHits[i] = 0; + } +} + + +/**Function************************************************************* + + Synopsis [Checks the correctness of the functional simulation table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_FeedBackCheckTable( Fraig_Man_t * p ) +{ + Fraig_HashTable_t * pT = p->pTableF; + Fraig_Node_t * pEntF, * pEntD; + int i, k, m, nPairs; + int clk = clock(); + + nPairs = 0; + for ( i = 0; i < pT->nBins; i++ ) + Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF ) + { + p->vCones->nSize = 0; + Fraig_TableBinForEachEntryD( pEntF, pEntD ) + Fraig_NodeVecPush( p->vCones, pEntD ); + if ( p->vCones->nSize == 1 ) + continue; + for ( k = 0; k < p->vCones->nSize; k++ ) + for ( m = k+1; m < p->vCones->nSize; m++ ) + { + if ( Fraig_CompareSimInfo( p->vCones->pArray[k], p->vCones->pArray[m], p->iWordStart, 0 ) ) + printf( "Nodes %d and %d have the same D simulation info.\n", + p->vCones->pArray[k]->Num, p->vCones->pArray[m]->Num ); + nPairs++; + } + } +// printf( "\nThe total of %d node pairs have been verified.\n", nPairs ); +} + +/**Function************************************************************* + + Synopsis [Checks the correctness of the functional simulation table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_FeedBackCheckTableF0( Fraig_Man_t * p ) +{ + Fraig_HashTable_t * pT = p->pTableF0; + Fraig_Node_t * pEntF; + int i, k, m, nPairs; + + nPairs = 0; + for ( i = 0; i < pT->nBins; i++ ) + { + p->vCones->nSize = 0; + Fraig_TableBinForEachEntryF( pT->pBins[i], pEntF ) + Fraig_NodeVecPush( p->vCones, pEntF ); + if ( p->vCones->nSize == 1 ) + continue; + for ( k = 0; k < p->vCones->nSize; k++ ) + for ( m = k+1; m < p->vCones->nSize; m++ ) + { + if ( Fraig_CompareSimInfo( p->vCones->pArray[k], p->vCones->pArray[m], p->iWordStart, 0 ) ) + printf( "Nodes %d and %d have the same D simulation info.\n", + p->vCones->pArray[k]->Num, p->vCones->pArray[m]->Num ); + nPairs++; + } + } +// printf( "\nThe total of %d node pairs have been verified.\n", nPairs ); +} + +/**Function************************************************************* + + Synopsis [Doubles the size of simulation info.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ReallocateSimulationInfo( Fraig_Man_t * p ) +{ + Fraig_MemFixed_t * mmSimsNew; // new memory manager for simulation info + Fraig_Node_t * pNode; + unsigned * pSimsNew; + unsigned uSignOld; + int i; + + // allocate a new memory manager + p->nWordsDyna *= 2; + mmSimsNew = Fraig_MemFixedStart( sizeof(unsigned) * (p->nWordsRand + p->nWordsDyna) ); + + // set the new data for the constant node + pNode = p->pConst1; + pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew ); + pNode->puSimD = pNode->puSimR + p->nWordsRand; + memset( pNode->puSimR, 0, sizeof(unsigned) * p->nWordsRand ); + memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna ); + + // copy the simulation info of the PIs + for ( i = 0; i < p->vInputs->nSize; i++ ) + { + pNode = p->vInputs->pArray[i]; + // copy the simulation info + pSimsNew = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew ); + memmove( pSimsNew, pNode->puSimR, sizeof(unsigned) * (p->nWordsRand + p->iWordStart) ); + // attach the new info + pNode->puSimR = pSimsNew; + pNode->puSimD = pNode->puSimR + p->nWordsRand; + // signatures remain without changes + } + + // replace the manager to free up some memory + Fraig_MemFixedStop( p->mmSims, 0 ); + p->mmSims = mmSimsNew; + + // resimulate the internal nodes (this should lead to the same signatures) + for ( i = 1; i < p->vNodes->nSize; i++ ) + { + pNode = p->vNodes->pArray[i]; + if ( !Fraig_NodeIsAnd(pNode) ) + continue; + // allocate memory for the simulation info + pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew ); + pNode->puSimD = pNode->puSimR + p->nWordsRand; + // derive random simulation info + uSignOld = pNode->uHashR; + pNode->uHashR = 0; + Fraig_NodeSimulate( pNode, 0, p->nWordsRand, 1 ); + assert( uSignOld == pNode->uHashR ); + // derive dynamic simulation info + uSignOld = pNode->uHashD; + pNode->uHashD = 0; + Fraig_NodeSimulate( pNode, 0, p->iWordStart, 0 ); + assert( uSignOld == pNode->uHashD ); + } + + // realloc temporary storage + p->pSimsReal = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew ); + memset( p->pSimsReal, 0, sizeof(unsigned) * p->nWordsDyna ); + p->pSimsTemp = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew ); + p->pSimsDiff = (unsigned *)Fraig_MemFixedEntryFetch( mmSimsNew ); +} + + +/**Function************************************************************* + + Synopsis [Generated trivial counter example.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int * Fraig_ManAllocCounterExample( Fraig_Man_t * p ) +{ + int * pModel; + pModel = ALLOC( int, p->vInputs->nSize ); + memset( pModel, 0, sizeof(int) * p->vInputs->nSize ); + return pModel; +} + + +/**Function************************************************************* + + Synopsis [Saves the counter example.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManSimulateBitNode_rec( Fraig_Man_t * p, Fraig_Node_t * pNode ) +{ + int Value0, Value1; + if ( Fraig_NodeIsTravIdCurrent( p, pNode ) ) + return pNode->fMark3; + Fraig_NodeSetTravIdCurrent( p, pNode ); + Value0 = Fraig_ManSimulateBitNode_rec( p, Fraig_Regular(pNode->p1) ); + Value1 = Fraig_ManSimulateBitNode_rec( p, Fraig_Regular(pNode->p2) ); + Value0 ^= Fraig_IsComplement(pNode->p1); + Value1 ^= Fraig_IsComplement(pNode->p2); + pNode->fMark3 = Value0 & Value1; + return pNode->fMark3; +} + +/**Function************************************************************* + + Synopsis [Simulates one bit.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManSimulateBitNode( Fraig_Man_t * p, Fraig_Node_t * pNode, int * pModel ) +{ + int fCompl, RetValue, i; + // set the PI values + Fraig_ManIncrementTravId( p ); + for ( i = 0; i < p->vInputs->nSize; i++ ) + { + Fraig_NodeSetTravIdCurrent( p, p->vInputs->pArray[i] ); + p->vInputs->pArray[i]->fMark3 = pModel[i]; + } + // perform the traversal + fCompl = Fraig_IsComplement(pNode); + RetValue = Fraig_ManSimulateBitNode_rec( p, Fraig_Regular(pNode) ); + return fCompl ^ RetValue; +} + + +/**Function************************************************************* + + Synopsis [Saves the counter example.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int * Fraig_ManSaveCounterExample( Fraig_Man_t * p, Fraig_Node_t * pNode ) +{ + int * pModel; + int iPattern; + int i, fCompl; + + // the node can be complemented + fCompl = Fraig_IsComplement(pNode); + // because we compare with constant 0, p->pConst1 should also be complemented + fCompl = !fCompl; + + // derive the model + pModel = Fraig_ManAllocCounterExample( p ); + iPattern = Fraig_FindFirstDiff( p->pConst1, Fraig_Regular(pNode), fCompl, p->nWordsRand, 1 ); + if ( iPattern >= 0 ) + { + for ( i = 0; i < p->vInputs->nSize; i++ ) + if ( Fraig_BitStringHasBit( p->vInputs->pArray[i]->puSimR, iPattern ) ) + pModel[i] = 1; +/* +printf( "SAT solver's pattern:\n" ); +for ( i = 0; i < p->vInputs->nSize; i++ ) + printf( "%d", pModel[i] ); +printf( "\n" ); +*/ + assert( Fraig_ManSimulateBitNode( p, pNode, pModel ) ); + return pModel; + } + iPattern = Fraig_FindFirstDiff( p->pConst1, Fraig_Regular(pNode), fCompl, p->iWordStart, 0 ); + if ( iPattern >= 0 ) + { + for ( i = 0; i < p->vInputs->nSize; i++ ) + if ( Fraig_BitStringHasBit( p->vInputs->pArray[i]->puSimD, iPattern ) ) + pModel[i] = 1; +/* +printf( "SAT solver's pattern:\n" ); +for ( i = 0; i < p->vInputs->nSize; i++ ) + printf( "%d", pModel[i] ); +printf( "\n" ); +*/ + assert( Fraig_ManSimulateBitNode( p, pNode, pModel ) ); + return pModel; + } + FREE( pModel ); + return NULL; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigInt.h b/src/sat/fraig/fraigInt.h new file mode 100644 index 00000000..9c6e0d47 --- /dev/null +++ b/src/sat/fraig/fraigInt.h @@ -0,0 +1,451 @@ +/**CFile**************************************************************** + + FileName [fraigInt.h] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Internal declarations of the FRAIG package.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigInt.h,v 1.15 2005/07/08 01:01:31 alanmi Exp $] + +***********************************************************************/ + +#ifndef __FRAIG_INT_H__ +#define __FRAIG_INT_H__ + +//////////////////////////////////////////////////////////////////////// +/// INCLUDES /// +//////////////////////////////////////////////////////////////////////// + +//#include "leaks.h" +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> +#include <time.h> + +#include "fraig.h" +#include "msat.h" + +//////////////////////////////////////////////////////////////////////// +/// PARAMETERS /// +//////////////////////////////////////////////////////////////////////// + +/* + The AIG node policy: + - Each node has its main number (pNode->Num) + This is the number of this node in the array of all nodes and its SAT variable number + - The PI nodes are stored along with other nodes + Additionally, PI nodes have a PI number, by which they are stored in the PI node array + - The constant node is has number 0 and is also stored in the array +*/ + +//////////////////////////////////////////////////////////////////////// +/// MACRO DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +// enable this macro to support the fanouts +#define FRAIG_ENABLE_FANOUTS +#define FRAIG_PATTERNS_RANDOM 2048 // should not be less than 128 and more than 32768 (2^15) +#define FRAIG_PATTERNS_DYNAMIC 2048 // should not be less than 256 and more than 32768 (2^15) +#define FRAIG_MAX_PRIMES 1024 // the maximum number of primes used for hashing + +// this parameter determines when simulation info is extended +// it will be extended when the free storage in the dynamic simulation +// info is less or equal to this number of words (FRAIG_WORDS_STORE) +// this is done because if the free storage for dynamic simulation info +// is not sufficient, computation becomes inefficient +#define FRAIG_WORDS_STORE 5 + +// the bit masks +#define FRAIG_MASK(n) ((~((unsigned)0)) >> (32-(n))) +#define FRAIG_FULL (~((unsigned)0)) +#define FRAIG_NUM_WORDS(n) (((n)>>5) + (((n)&31) > 0)) + +// maximum/minimum operators +#define FRAIG_MIN(a,b) (((a) < (b))? (a) : (b)) +#define FRAIG_MAX(a,b) (((a) > (b))? (a) : (b)) + +// generating random unsigned (#define RAND_MAX 0x7fff) +#define FRAIG_RANDOM_UNSIGNED ((((unsigned)rand()) << 24) ^ (((unsigned)rand()) << 12) ^ ((unsigned)rand())) + +// macros to get hold of the bits in a bit string +#define Fraig_BitStringSetBit(p,i) ((p)[(i)>>5] |= (1<<((i) & 31))) +#define Fraig_BitStringXorBit(p,i) ((p)[(i)>>5] ^= (1<<((i) & 31))) +#define Fraig_BitStringHasBit(p,i) (((p)[(i)>>5] & (1<<((i) & 31))) > 0) + +// macros to get hold of the bits in the support info +//#define Fraig_NodeSetVarStr(p,i) (Fraig_Regular(p)->pSuppStr[((i)%FRAIG_SUPP_SIGN)>>5] |= (1<<(((i)%FRAIG_SUPP_SIGN) & 31))) +//#define Fraig_NodeHasVarStr(p,i) ((Fraig_Regular(p)->pSuppStr[((i)%FRAIG_SUPP_SIGN)>>5] & (1<<(((i)%FRAIG_SUPP_SIGN) & 31))) > 0) +#define Fraig_NodeSetVarStr(p,i) Fraig_BitStringSetBit(Fraig_Regular(p)->pSuppStr,i) +#define Fraig_NodeHasVarStr(p,i) Fraig_BitStringHasBit(Fraig_Regular(p)->pSuppStr,i) + +// copied from "util.h" for standaloneness +#ifndef ALLOC +# define ALLOC(type, num) \ + ((type *) malloc(sizeof(type) * (num))) +#endif + +#ifndef REALLOC +# define REALLOC(type, obj, num) \ + (obj) ? ((type *) realloc((char *) obj, sizeof(type) * (num))) : \ + ((type *) malloc(sizeof(type) * (num))) +#endif + +#ifndef FREE +# define FREE(obj) \ + ((obj) ? (free((char *) (obj)), (obj) = 0) : 0) +#endif + +// copied from "extra.h" for stand-aloneness +#define Fraig_PrintTime(a,t) printf( "%s = ", (a) ); printf( "%6.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC) ) + +#define Fraig_HashKey2(a,b,TSIZE) (((unsigned)(a) + (unsigned)(b) * 12582917) % TSIZE) +//#define Fraig_HashKey2(a,b,TSIZE) (( ((unsigned)(a)->Num * 19) ^ ((unsigned)(b)->Num * 1999) ) % TSIZE) +//#define Fraig_HashKey2(a,b,TSIZE) ( ((unsigned)((a)->Num + (b)->Num) * ((a)->Num + (b)->Num + 1) / 2) % TSIZE) +// the other two hash functions give bad distribution of hash chain lengths (not clear why) + +#ifndef PRT +#define PRT(a,t) printf( "%s = ", (a) ); printf( "%6.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC) ) +#endif + +//////////////////////////////////////////////////////////////////////// +/// STRUCTURE DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +typedef struct Fraig_MemFixed_t_ Fraig_MemFixed_t; + +// the mapping manager +struct Fraig_ManStruct_t_ +{ + // the AIG nodes + Fraig_NodeVec_t * vInputs; // the array of primary inputs + Fraig_NodeVec_t * vNodes; // the array of all nodes, including primary inputs + Fraig_NodeVec_t * vOutputs; // the array of primary outputs (some internal nodes) + Fraig_Node_t * pConst1; // the pointer to the constant node (vNodes->pArray[0]) + + // info about the original circuit + char ** ppInputNames; // the primary input names + char ** ppOutputNames; // the primary output names + + // various hash-tables + Fraig_HashTable_t * pTableS; // hashing by structure + Fraig_HashTable_t * pTableF; // hashing by simulation info + Fraig_HashTable_t * pTableF0; // hashing by simulation info (sparse functions) + + // parameters + int nWordsRand; // the number of words of random simulation info + int nWordsDyna; // the number of words of dynamic simulation info + int nBTLimit; // the max number of backtracks to perform + int nSeconds; // the runtime limit for the miter proof + int fFuncRed; // performs only one level hashing + int fFeedBack; // enables solver feedback + int fDist1Pats; // enables solver feedback + int fDoSparse; // performs equiv tests for sparse functions + int fChoicing; // enables recording structural choices + int fTryProve; // tries to solve the final miter + int fVerbose; // the verbosiness flag + int fVerboseP; // the verbosiness flag + sint64 nInspLimit; // the inspection limit + + int nTravIds; // the traversal counter + int nTravIds2; // the traversal counter + + // info related to the solver feedback + int iWordStart; // the first word to use for simulation + int iWordPerm; // the number of words stored permanently + int iPatsPerm; // the number of patterns stored permanently + Fraig_NodeVec_t * vCones; // the temporary array of internal variables + Msat_IntVec_t * vPatsReal; // the array of real pattern numbers + unsigned * pSimsReal; // used for simulation patterns + unsigned * pSimsDiff; // used for simulation patterns + unsigned * pSimsTemp; // used for simulation patterns + + // the support information + int nSuppWords; + unsigned ** pSuppS; + unsigned ** pSuppF; + + // the memory managers + Fraig_MemFixed_t * mmNodes; // the memory manager for nodes + Fraig_MemFixed_t * mmSims; // the memory manager for simulation info + + // solving the SAT problem + Msat_Solver_t * pSat; // the SAT solver + Msat_IntVec_t * vProj; // the temporary array of projection vars + int nSatNums; // the counter of SAT variables + int * pModel; // the assignment, which satisfies the miter + // these arrays belong to the solver + Msat_IntVec_t * vVarsInt; // the temporary array of variables + Msat_ClauseVec_t * vAdjacents; // the temporary storage for connectivity + Msat_IntVec_t * vVarsUsed; // the array marking vars appearing in the cone + + // various statistic variables + int nSatCalls; // the number of times equivalence checking was called + int nSatProof; // the number of times a proof was found + int nSatCounter; // the number of times a counter example was found + int nSatFails; // the number of times the SAT solver failed to complete due to resource limit or prediction + int nSatFailsReal; // the number of times the SAT solver failed to complete due to resource limit + + int nSatCallsImp; // the number of times equivalence checking was called + int nSatProofImp; // the number of times a proof was found + int nSatCounterImp;// the number of times a counter example was found + int nSatFailsImp; // the number of times the SAT solver failed to complete + + int nSatZeros; // the number of times the simulation vector is zero + int nSatSupps; // the number of times the support info was useful + int nRefErrors; // the number of ref counting errors + int nImplies; // the number of implication cases + int nSatImpls; // the number of implication SAT calls + int nVarsClauses; // the number of variables with clauses + int nSimplifies0; + int nSimplifies1; + int nImplies0; + int nImplies1; + + // runtime statistics + int timeToAig; // time to transfer to the mapping structure + int timeSims; // time to compute k-feasible cuts + int timeTrav; // time to traverse the network + int timeFeed; // time for solver feedback (recording and resimulating) + int timeImply; // time to analyze implications + int timeSat; // time to compute the truth table for each cut + int timeToNet; // time to transfer back to the network + int timeTotal; // the total mapping time + int time1; // time to perform one task + int time2; // time to perform another task + int time3; // time to perform another task + int time4; // time to perform another task +}; + +// the mapping node +struct Fraig_NodeStruct_t_ +{ + // various numbers associated with the node + int Num; // the unique number (SAT var number) of this node + int NumPi; // if the node is a PI, this is its variable number + int Level; // the level of the node + int nRefs; // the number of references of the node + int TravId; // the traversal ID (use to avoid cleaning marks) + int TravId2; // the traversal ID (use to avoid cleaning marks) + + // general information about the node + unsigned fInv : 1; // the mark to show that simulation info is complemented + unsigned fNodePo : 1; // the mark used for primary outputs + unsigned fClauses : 1; // the clauses for this node are loaded + unsigned fMark0 : 1; // the mark used for traversals + unsigned fMark1 : 1; // the mark used for traversals + unsigned fMark2 : 1; // the mark used for traversals + unsigned fMark3 : 1; // the mark used for traversals + unsigned fFeedUse : 1; // the presence of the variable in the feedback + unsigned fFeedVal : 1; // the value of the variable in the feedback + unsigned fFailTfo : 1; // the node is in the TFO of the failed SAT run + unsigned nFanouts : 2; // the indicator of fanouts (none, one, or many) + unsigned nOnes : 20; // the number of 1's in the random sim info + + // the children of the node + Fraig_Node_t * p1; // the first child + Fraig_Node_t * p2; // the second child + Fraig_NodeVec_t * vFanins; // the fanins of the supergate rooted at this node +// Fraig_NodeVec_t * vFanouts; // the fanouts of the supergate rooted at this node + + // various linked lists + Fraig_Node_t * pNextS; // the next node in the structural hash table + Fraig_Node_t * pNextF; // the next node in the functional (simulation) hash table + Fraig_Node_t * pNextD; // the next node in the list of nodes based on dynamic simulation + Fraig_Node_t * pNextE; // the next structural choice (functionally-equivalent node) + Fraig_Node_t * pRepr; // the canonical functional representative of the node + + // simulation data + unsigned uHashR; // the hash value for random information + unsigned uHashD; // the hash value for dynamic information + unsigned * puSimR; // the simulation information (random) + unsigned * puSimD; // the simulation information (dynamic) + + // misc information + Fraig_Node_t * pData0; // temporary storage for the corresponding network node + Fraig_Node_t * pData1; // temporary storage for the corresponding network node + +#ifdef FRAIG_ENABLE_FANOUTS + // representation of node's fanouts + Fraig_Node_t * pFanPivot; // the first fanout of this node + Fraig_Node_t * pFanFanin1; // the next fanout of p1 + Fraig_Node_t * pFanFanin2; // the next fanout of p2 +#endif +}; + +// the vector of nodes +struct Fraig_NodeVecStruct_t_ +{ + int nCap; // the number of allocated entries + int nSize; // the number of entries in the array + Fraig_Node_t ** pArray; // the array of nodes +}; + +// the hash table +struct Fraig_HashTableStruct_t_ +{ + Fraig_Node_t ** pBins; // the table bins + int nBins; // the size of the table + int nEntries; // the total number of entries in the table +}; + +// getting hold of the next fanout of the node +#define Fraig_NodeReadNextFanout( pNode, pFanout ) \ + ( ( pFanout == NULL )? NULL : \ + ((Fraig_Regular((pFanout)->p1) == (pNode))? \ + (pFanout)->pFanFanin1 : (pFanout)->pFanFanin2) ) +// getting hold of the place where the next fanout will be attached +#define Fraig_NodeReadNextFanoutPlace( pNode, pFanout ) \ + ( (Fraig_Regular((pFanout)->p1) == (pNode))? \ + &(pFanout)->pFanFanin1 : &(pFanout)->pFanFanin2 ) +// iterator through the fanouts of the node +#define Fraig_NodeForEachFanout( pNode, pFanout ) \ + for ( pFanout = (pNode)->pFanPivot; pFanout; \ + pFanout = Fraig_NodeReadNextFanout(pNode, pFanout) ) +// safe iterator through the fanouts of the node +#define Fraig_NodeForEachFanoutSafe( pNode, pFanout, pFanout2 ) \ + for ( pFanout = (pNode)->pFanPivot, \ + pFanout2 = Fraig_NodeReadNextFanout(pNode, pFanout); \ + pFanout; \ + pFanout = pFanout2, \ + pFanout2 = Fraig_NodeReadNextFanout(pNode, pFanout) ) + +// iterators through the entries in the linked lists of nodes +// the list of nodes in the structural hash table +#define Fraig_TableBinForEachEntryS( pBin, pEnt ) \ + for ( pEnt = pBin; \ + pEnt; \ + pEnt = pEnt->pNextS ) +#define Fraig_TableBinForEachEntrySafeS( pBin, pEnt, pEnt2 ) \ + for ( pEnt = pBin, \ + pEnt2 = pEnt? pEnt->pNextS: NULL; \ + pEnt; \ + pEnt = pEnt2, \ + pEnt2 = pEnt? pEnt->pNextS: NULL ) +// the list of nodes in the functional (simulation) hash table +#define Fraig_TableBinForEachEntryF( pBin, pEnt ) \ + for ( pEnt = pBin; \ + pEnt; \ + pEnt = pEnt->pNextF ) +#define Fraig_TableBinForEachEntrySafeF( pBin, pEnt, pEnt2 ) \ + for ( pEnt = pBin, \ + pEnt2 = pEnt? pEnt->pNextF: NULL; \ + pEnt; \ + pEnt = pEnt2, \ + pEnt2 = pEnt? pEnt->pNextF: NULL ) +// the list of nodes with the same simulation and different functionality +#define Fraig_TableBinForEachEntryD( pBin, pEnt ) \ + for ( pEnt = pBin; \ + pEnt; \ + pEnt = pEnt->pNextD ) +#define Fraig_TableBinForEachEntrySafeD( pBin, pEnt, pEnt2 ) \ + for ( pEnt = pBin, \ + pEnt2 = pEnt? pEnt->pNextD: NULL; \ + pEnt; \ + pEnt = pEnt2, \ + pEnt2 = pEnt? pEnt->pNextD: NULL ) +// the list of nodes with the same functionality +#define Fraig_TableBinForEachEntryE( pBin, pEnt ) \ + for ( pEnt = pBin; \ + pEnt; \ + pEnt = pEnt->pNextE ) +#define Fraig_TableBinForEachEntrySafeE( pBin, pEnt, pEnt2 ) \ + for ( pEnt = pBin, \ + pEnt2 = pEnt? pEnt->pNextE: NULL; \ + pEnt; \ + pEnt = pEnt2, \ + pEnt2 = pEnt? pEnt->pNextE: NULL ) + +//////////////////////////////////////////////////////////////////////// +/// GLOBAL VARIABLES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/*=== fraigCanon.c =============================================================*/ +extern Fraig_Node_t * Fraig_NodeAndCanon( Fraig_Man_t * pMan, Fraig_Node_t * p1, Fraig_Node_t * p2 ); +/*=== fraigFanout.c =============================================================*/ +extern void Fraig_NodeAddFaninFanout( Fraig_Node_t * pFanin, Fraig_Node_t * pFanout ); +extern void Fraig_NodeRemoveFaninFanout( Fraig_Node_t * pFanin, Fraig_Node_t * pFanoutToRemove ); +extern int Fraig_NodeGetFanoutNum( Fraig_Node_t * pNode ); +/*=== fraigFeed.c =============================================================*/ +extern void Fraig_FeedBackInit( Fraig_Man_t * p ); +extern void Fraig_FeedBack( Fraig_Man_t * p, int * pModel, Msat_IntVec_t * vVars, Fraig_Node_t * pOld, Fraig_Node_t * pNew ); +extern void Fraig_FeedBackTest( Fraig_Man_t * p ); +extern int Fraig_FeedBackCompress( Fraig_Man_t * p ); +extern int * Fraig_ManAllocCounterExample( Fraig_Man_t * p ); +extern int * Fraig_ManSaveCounterExample( Fraig_Man_t * p, Fraig_Node_t * pNode ); +/*=== fraigMan.c =============================================================*/ +extern void Fraig_ManCreateSolver( Fraig_Man_t * p ); +/*=== fraigMem.c =============================================================*/ +extern Fraig_MemFixed_t * Fraig_MemFixedStart( int nEntrySize ); +extern void Fraig_MemFixedStop( Fraig_MemFixed_t * p, int fVerbose ); +extern char * Fraig_MemFixedEntryFetch( Fraig_MemFixed_t * p ); +extern void Fraig_MemFixedEntryRecycle( Fraig_MemFixed_t * p, char * pEntry ); +extern void Fraig_MemFixedRestart( Fraig_MemFixed_t * p ); +extern int Fraig_MemFixedReadMemUsage( Fraig_MemFixed_t * p ); +/*=== fraigNode.c =============================================================*/ +extern Fraig_Node_t * Fraig_NodeCreateConst( Fraig_Man_t * p ); +extern Fraig_Node_t * Fraig_NodeCreatePi( Fraig_Man_t * p ); +extern Fraig_Node_t * Fraig_NodeCreate( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ); +extern void Fraig_NodeSimulate( Fraig_Node_t * pNode, int iWordStart, int iWordStop, int fUseRand ); +/*=== fraigPrime.c =============================================================*/ +extern int s_FraigPrimes[FRAIG_MAX_PRIMES]; +extern unsigned int Cudd_PrimeFraig( unsigned int p ); +/*=== fraigSat.c ===============================================================*/ +extern int Fraig_NodeIsImplication( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit ); +/*=== fraigTable.c =============================================================*/ +extern Fraig_HashTable_t * Fraig_HashTableCreate( int nSize ); +extern void Fraig_HashTableFree( Fraig_HashTable_t * p ); +extern int Fraig_HashTableLookupS( Fraig_Man_t * pMan, Fraig_Node_t * p1, Fraig_Node_t * p2, Fraig_Node_t ** ppNodeRes ); +extern Fraig_Node_t * Fraig_HashTableLookupF( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +extern Fraig_Node_t * Fraig_HashTableLookupF0( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +extern void Fraig_HashTableInsertF0( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +extern int Fraig_CompareSimInfo( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand ); +extern int Fraig_CompareSimInfoUnderMask( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand, unsigned * puMask ); +extern int Fraig_FindFirstDiff( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int fCompl, int iWordLast, int fUseRand ); +extern void Fraig_CollectXors( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand, unsigned * puMask ); +extern void Fraig_TablePrintStatsS( Fraig_Man_t * pMan ); +extern void Fraig_TablePrintStatsF( Fraig_Man_t * pMan ); +extern void Fraig_TablePrintStatsF0( Fraig_Man_t * pMan ); +extern int Fraig_TableRehashF0( Fraig_Man_t * pMan, int fLinkEquiv ); +/*=== fraigUtil.c ===============================================================*/ +extern int Fraig_NodeCountPis( Msat_IntVec_t * vVars, int nVarsPi ); +extern int Fraig_NodeCountSuppVars( Fraig_Man_t * p, Fraig_Node_t * pNode, int fSuppStr ); +extern int Fraig_NodesCompareSupps( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew ); +extern int Fraig_NodeAndSimpleCase_rec( Fraig_Node_t * pOld, Fraig_Node_t * pNew ); +extern int Fraig_NodeIsExorType( Fraig_Node_t * pNode ); +extern void Fraig_ManSelectBestChoice( Fraig_Man_t * p ); +extern int Fraig_BitStringCountOnes( unsigned * pString, int nWords ); +extern void Fraig_PrintBinary( FILE * pFile, unsigned * pSign, int nBits ); +extern int Fraig_NodeIsExorType( Fraig_Node_t * pNode ); +extern int Fraig_NodeIsExor( Fraig_Node_t * pNode ); +extern int Fraig_NodeIsMuxType( Fraig_Node_t * pNode ); +extern Fraig_Node_t * Fraig_NodeRecognizeMux( Fraig_Node_t * pNode, Fraig_Node_t ** ppNodeT, Fraig_Node_t ** ppNodeE ); +extern int Fraig_ManCountExors( Fraig_Man_t * pMan ); +extern int Fraig_ManCountMuxes( Fraig_Man_t * pMan ); +extern int Fraig_NodeSimsContained( Fraig_Man_t * pMan, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 ); +extern int Fraig_NodeIsInSupergate( Fraig_Node_t * pOld, Fraig_Node_t * pNew ); +extern Fraig_NodeVec_t * Fraig_CollectSupergate( Fraig_Node_t * pNode, int fStopAtMux ); +extern int Fraig_CountPis( Fraig_Man_t * p, Msat_IntVec_t * vVarNums ); +extern void Fraig_ManIncrementTravId( Fraig_Man_t * pMan ); +extern void Fraig_NodeSetTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +extern int Fraig_NodeIsTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +extern int Fraig_NodeIsTravIdPrevious( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +/*=== fraigVec.c ===============================================================*/ +extern void Fraig_NodeVecSortByRefCount( Fraig_NodeVec_t * p ); + +#endif + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// diff --git a/src/sat/fraig/fraigMan.c b/src/sat/fraig/fraigMan.c new file mode 100644 index 00000000..7fd937d5 --- /dev/null +++ b/src/sat/fraig/fraigMan.c @@ -0,0 +1,540 @@ +/**CFile**************************************************************** + + FileName [fraigMan.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Implementation of the FRAIG manager.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigMan.c,v 1.11 2005/07/08 01:01:31 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +int timeSelect; +int timeAssign; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Sets the default parameters of the package.] + + Description [This set of parameters is tuned for equivalence checking.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Prove_ParamsSetDefault( Prove_Params_t * pParams ) +{ + // clean the parameter structure + memset( pParams, 0, sizeof(Prove_Params_t) ); + // general parameters + pParams->fUseFraiging = 1; // enables fraiging + pParams->fUseRewriting = 1; // enables rewriting + pParams->fUseBdds = 0; // enables BDD construction when other methods fail + pParams->fVerbose = 0; // prints verbose stats + // iterations + pParams->nItersMax = 6; // the number of iterations + // mitering + pParams->nMiteringLimitStart = 300; // starting mitering limit + pParams->nMiteringLimitMulti = 2.0; // multiplicative coefficient to increase the limit in each iteration + // rewriting (currently not used) + pParams->nRewritingLimitStart = 3; // the number of rewriting iterations + pParams->nRewritingLimitMulti = 1.0; // multiplicative coefficient to increase the limit in each iteration + // fraiging + pParams->nFraigingLimitStart = 2; // starting backtrack(conflict) limit + pParams->nFraigingLimitMulti = 8.0; // multiplicative coefficient to increase the limit in each iteration + // last-gasp BDD construction + pParams->nBddSizeLimit = 1000000; // the number of BDD nodes when construction is aborted + pParams->fBddReorder = 1; // enables dynamic BDD variable reordering + // last-gasp mitering +// pParams->nMiteringLimitLast = 1000000; // final mitering limit + pParams->nMiteringLimitLast = 0; // final mitering limit + // global SAT solver limits + pParams->nTotalBacktrackLimit = 0; // global limit on the number of backtracks + pParams->nTotalInspectLimit = 0; // global limit on the number of clause inspects +// pParams->nTotalInspectLimit = 100000000; // global limit on the number of clause inspects +} + +/**Function************************************************************* + + Synopsis [Prints out the current values of CEC engine parameters.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Prove_ParamsPrint( Prove_Params_t * pParams ) +{ + printf( "CEC enging parameters:\n" ); + printf( "Fraiging enabled: %s\n", pParams->fUseFraiging? "yes":"no" ); + printf( "Rewriting enabled: %s\n", pParams->fUseRewriting? "yes":"no" ); + printf( "BDD construction enabled: %s\n", pParams->fUseBdds? "yes":"no" ); + printf( "Verbose output enabled: %s\n", pParams->fVerbose? "yes":"no" ); + printf( "Solver iterations: %d\n", pParams->nItersMax ); + printf( "Starting mitering limit: %d\n", pParams->nMiteringLimitStart ); + printf( "Multiplicative coeficient for mitering: %.2f\n", pParams->nMiteringLimitMulti ); + printf( "Starting number of rewriting iterations: %d\n", pParams->nRewritingLimitStart ); + printf( "Multiplicative coeficient for rewriting: %.2f\n", pParams->nRewritingLimitMulti ); + printf( "Starting number of conflicts in fraiging: %d\n", pParams->nFraigingLimitMulti ); + printf( "Multiplicative coeficient for fraiging: %.2f\n", pParams->nRewritingLimitMulti ); + printf( "BDD size limit for bailing out: %.2f\n", pParams->nBddSizeLimit ); + printf( "BDD reordering enabled: %s\n", pParams->fBddReorder? "yes":"no" ); + printf( "Last-gasp mitering limit: %d\n", pParams->nMiteringLimitLast ); + printf( "Total conflict limit: %d\n", pParams->nTotalBacktrackLimit ); + printf( "Total inspection limit: %d\n", pParams->nTotalInspectLimit ); + printf( "Parameter dump complete.\n" ); +} + +/**Function************************************************************* + + Synopsis [Sets the default parameters of the package.] + + Description [This set of parameters is tuned for equivalence checking.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ParamsSetDefault( Fraig_Params_t * pParams ) +{ + memset( pParams, 0, sizeof(Fraig_Params_t) ); + pParams->nPatsRand = FRAIG_PATTERNS_RANDOM; // the number of words of random simulation info + pParams->nPatsDyna = FRAIG_PATTERNS_DYNAMIC; // the number of words of dynamic simulation info + pParams->nBTLimit = 99; // the max number of backtracks to perform + pParams->nSeconds = 20; // the max number of seconds to solve the miter + pParams->fFuncRed = 1; // performs only one level hashing + pParams->fFeedBack = 1; // enables solver feedback + pParams->fDist1Pats = 1; // enables distance-1 patterns + pParams->fDoSparse = 0; // performs equiv tests for sparse functions + pParams->fChoicing = 0; // enables recording structural choices + pParams->fTryProve = 1; // tries to solve the final miter + pParams->fVerbose = 0; // the verbosiness flag + pParams->fVerboseP = 0; // the verbose flag for reporting the proof + pParams->fInternal = 0; // the flag indicates the internal run + pParams->nConfLimit = 0; // the limit on the number of conflicts + pParams->nInspLimit = 0; // the limit on the number of inspections +} + +/**Function************************************************************* + + Synopsis [Sets the default parameters of the package.] + + Description [This set of parameters is tuned for complete FRAIGing.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ParamsSetDefaultFull( Fraig_Params_t * pParams ) +{ + memset( pParams, 0, sizeof(Fraig_Params_t) ); + pParams->nPatsRand = FRAIG_PATTERNS_RANDOM; // the number of words of random simulation info + pParams->nPatsDyna = FRAIG_PATTERNS_DYNAMIC; // the number of words of dynamic simulation info + pParams->nBTLimit = -1; // the max number of backtracks to perform + pParams->nSeconds = 20; // the max number of seconds to solve the miter + pParams->fFuncRed = 1; // performs only one level hashing + pParams->fFeedBack = 1; // enables solver feedback + pParams->fDist1Pats = 1; // enables distance-1 patterns + pParams->fDoSparse = 1; // performs equiv tests for sparse functions + pParams->fChoicing = 0; // enables recording structural choices + pParams->fTryProve = 0; // tries to solve the final miter + pParams->fVerbose = 0; // the verbosiness flag + pParams->fVerboseP = 0; // the verbose flag for reporting the proof + pParams->fInternal = 0; // the flag indicates the internal run + pParams->nConfLimit = 0; // the limit on the number of conflicts + pParams->nInspLimit = 0; // the limit on the number of inspections +} + +/**Function************************************************************* + + Synopsis [Creates the new FRAIG manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Man_t * Fraig_ManCreate( Fraig_Params_t * pParams ) +{ + Fraig_Params_t Params; + Fraig_Man_t * p; + + // set the random seed for simulation +// srand( 0xFEEDDEAF ); + srand( 0xDEADCAFE ); + + // set parameters for equivalence checking + if ( pParams == NULL ) + Fraig_ParamsSetDefault( pParams = &Params ); + // adjust the amount of simulation info + if ( pParams->nPatsRand < 128 ) + pParams->nPatsRand = 128; + if ( pParams->nPatsRand > 32768 ) + pParams->nPatsRand = 32768; + if ( pParams->nPatsDyna < 128 ) + pParams->nPatsDyna = 128; + if ( pParams->nPatsDyna > 32768 ) + pParams->nPatsDyna = 32768; + // if reduction is not performed, allocate minimum simulation info + if ( !pParams->fFuncRed ) + pParams->nPatsRand = pParams->nPatsDyna = 128; + + // start the manager + p = ALLOC( Fraig_Man_t, 1 ); + memset( p, 0, sizeof(Fraig_Man_t) ); + + // set the default parameters + p->nWordsRand = FRAIG_NUM_WORDS( pParams->nPatsRand ); // the number of words of random simulation info + p->nWordsDyna = FRAIG_NUM_WORDS( pParams->nPatsDyna ); // the number of patterns for dynamic simulation info + p->nBTLimit = pParams->nBTLimit; // -1 means infinite backtrack limit + p->nSeconds = pParams->nSeconds; // the timeout for the final miter + p->fFuncRed = pParams->fFuncRed; // enables functional reduction (otherwise, only one-level hashing is performed) + p->fFeedBack = pParams->fFeedBack; // enables solver feedback (the use of counter-examples in simulation) + p->fDist1Pats = pParams->fDist1Pats; // enables solver feedback (the use of counter-examples in simulation) + p->fDoSparse = pParams->fDoSparse; // performs equivalence checking for sparse functions (whose sim-info is 0) + p->fChoicing = pParams->fChoicing; // disable accumulation of structural choices (keeps only the first choice) + p->fTryProve = pParams->fTryProve; // disable accumulation of structural choices (keeps only the first choice) + p->fVerbose = pParams->fVerbose; // disable verbose output + p->fVerboseP = pParams->fVerboseP; // disable verbose output + p->nInspLimit = pParams->nInspLimit; // the limit on the number of inspections + + // start memory managers + p->mmNodes = Fraig_MemFixedStart( sizeof(Fraig_Node_t) ); + p->mmSims = Fraig_MemFixedStart( sizeof(unsigned) * (p->nWordsRand + p->nWordsDyna) ); + // allocate node arrays + p->vInputs = Fraig_NodeVecAlloc( 1000 ); // the array of primary inputs + p->vOutputs = Fraig_NodeVecAlloc( 1000 ); // the array of primary outputs + p->vNodes = Fraig_NodeVecAlloc( 1000 ); // the array of internal nodes + // start the tables + p->pTableS = Fraig_HashTableCreate( 1000 ); // hashing by structure + p->pTableF = Fraig_HashTableCreate( 1000 ); // hashing by function + p->pTableF0 = Fraig_HashTableCreate( 1000 ); // hashing by function (for sparse functions) + // create the constant node + p->pConst1 = Fraig_NodeCreateConst( p ); + // initialize SAT solver feedback data structures + Fraig_FeedBackInit( p ); + // initialize other variables + p->vProj = Msat_IntVecAlloc( 10 ); + p->nTravIds = 1; + p->nTravIds2 = 1; + return p; +} + +/**Function************************************************************* + + Synopsis [Deallocates the mapping manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManFree( Fraig_Man_t * p ) +{ + int i; + if ( p->fVerbose ) + { + if ( p->fChoicing ) Fraig_ManReportChoices( p ); + Fraig_ManPrintStats( p ); +// Fraig_TablePrintStatsS( p ); +// Fraig_TablePrintStatsF( p ); +// Fraig_TablePrintStatsF0( p ); + } + + for ( i = 0; i < p->vNodes->nSize; i++ ) + if ( p->vNodes->pArray[i]->vFanins ) + { + Fraig_NodeVecFree( p->vNodes->pArray[i]->vFanins ); + p->vNodes->pArray[i]->vFanins = NULL; + } + + if ( p->vInputs ) Fraig_NodeVecFree( p->vInputs ); + if ( p->vNodes ) Fraig_NodeVecFree( p->vNodes ); + if ( p->vOutputs ) Fraig_NodeVecFree( p->vOutputs ); + + if ( p->pTableS ) Fraig_HashTableFree( p->pTableS ); + if ( p->pTableF ) Fraig_HashTableFree( p->pTableF ); + if ( p->pTableF0 ) Fraig_HashTableFree( p->pTableF0 ); + + if ( p->pSat ) Msat_SolverFree( p->pSat ); + if ( p->vProj ) Msat_IntVecFree( p->vProj ); + if ( p->vCones ) Fraig_NodeVecFree( p->vCones ); + if ( p->vPatsReal ) Msat_IntVecFree( p->vPatsReal ); + if ( p->pModel ) free( p->pModel ); + + Fraig_MemFixedStop( p->mmNodes, 0 ); + Fraig_MemFixedStop( p->mmSims, 0 ); + + if ( p->pSuppS ) + { + FREE( p->pSuppS[0] ); + FREE( p->pSuppS ); + } + if ( p->pSuppF ) + { + FREE( p->pSuppF[0] ); + FREE( p->pSuppF ); + } + + FREE( p->ppOutputNames ); + FREE( p->ppInputNames ); + FREE( p ); +} + +/**Function************************************************************* + + Synopsis [Prepares the SAT solver to run on the two nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManCreateSolver( Fraig_Man_t * p ) +{ + extern int timeSelect; + extern int timeAssign; + assert( p->pSat == NULL ); + // allocate data for SAT solving + p->pSat = Msat_SolverAlloc( 500, 1, 1, 1, 1, 0 ); + p->vVarsInt = Msat_SolverReadConeVars( p->pSat ); + p->vAdjacents = Msat_SolverReadAdjacents( p->pSat ); + p->vVarsUsed = Msat_SolverReadVarsUsed( p->pSat ); + timeSelect = 0; + timeAssign = 0; +} + + +/**Function************************************************************* + + Synopsis [Deallocates the mapping manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManPrintStats( Fraig_Man_t * p ) +{ + double nMemory; + int clk = clock(); + nMemory = ((double)(p->vInputs->nSize + p->vNodes->nSize) * + (sizeof(Fraig_Node_t) + sizeof(unsigned)*(p->nWordsRand + p->nWordsDyna) /*+ p->nSuppWords*sizeof(unsigned)*/))/(1<<20); + printf( "Words: Random = %d. Dynamic = %d. Used = %d. Memory = %0.2f Mb.\n", + p->nWordsRand, p->nWordsDyna, p->iWordPerm, nMemory ); + printf( "Proof = %d. Counter-example = %d. Fail = %d. FailReal = %d. Zero = %d.\n", + p->nSatProof, p->nSatCounter, p->nSatFails, p->nSatFailsReal, p->nSatZeros ); + printf( "Nodes: Final = %d. Total = %d. Mux = %d. (Exor = %d.) ClaVars = %d.\n", + Fraig_CountNodes(p,0), p->vNodes->nSize, Fraig_ManCountMuxes(p), Fraig_ManCountExors(p), p->nVarsClauses ); + if ( p->pSat ) Msat_SolverPrintStats( p->pSat ); + Fraig_PrintTime( "AIG simulation ", p->timeSims ); + Fraig_PrintTime( "AIG traversal ", p->timeTrav ); + Fraig_PrintTime( "Solver feedback ", p->timeFeed ); + Fraig_PrintTime( "SAT solving ", p->timeSat ); + Fraig_PrintTime( "Network update ", p->timeToNet ); + Fraig_PrintTime( "TOTAL RUNTIME ", p->timeTotal ); + if ( p->time1 > 0 ) { Fraig_PrintTime( "time1", p->time1 ); } + if ( p->time2 > 0 ) { Fraig_PrintTime( "time2", p->time2 ); } + if ( p->time3 > 0 ) { Fraig_PrintTime( "time3", p->time3 ); } + if ( p->time4 > 0 ) { Fraig_PrintTime( "time4", p->time4 ); } +// PRT( "Selection ", timeSelect ); +// PRT( "Assignment", timeAssign ); +} + +/**Function************************************************************* + + Synopsis [Allocates simulation information for all nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_UtilInfoAlloc( int nSize, int nWords, bool fClean ) +{ + Fraig_NodeVec_t * vInfo; + unsigned * pUnsigned; + int i; + assert( nSize > 0 && nWords > 0 ); + vInfo = Fraig_NodeVecAlloc( nSize ); + pUnsigned = ALLOC( unsigned, nSize * nWords ); + vInfo->pArray[0] = (Fraig_Node_t *)pUnsigned; + if ( fClean ) + memset( pUnsigned, 0, sizeof(unsigned) * nSize * nWords ); + for ( i = 1; i < nSize; i++ ) + vInfo->pArray[i] = (Fraig_Node_t *)(((unsigned *)vInfo->pArray[i-1]) + nWords); + vInfo->nSize = nSize; + return vInfo; +} + +/**Function************************************************************* + + Synopsis [Returns simulation info of all nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_ManGetSimInfo( Fraig_Man_t * p ) +{ + Fraig_NodeVec_t * vInfo; + Fraig_Node_t * pNode; + unsigned * pUnsigned; + int nRandom, nDynamic; + int i, k, nWords; + + nRandom = Fraig_ManReadPatternNumRandom( p ); + nDynamic = Fraig_ManReadPatternNumDynamic( p ); + nWords = nRandom / 32 + nDynamic / 32; + + vInfo = Fraig_UtilInfoAlloc( p->vNodes->nSize, nWords, 0 ); + for ( i = 0; i < p->vNodes->nSize; i++ ) + { + pNode = p->vNodes->pArray[i]; + assert( i == pNode->Num ); + pUnsigned = (unsigned *)vInfo->pArray[i]; + for ( k = 0; k < nRandom / 32; k++ ) + pUnsigned[k] = pNode->puSimR[k]; + for ( k = 0; k < nDynamic / 32; k++ ) + pUnsigned[nRandom / 32 + k] = pNode->puSimD[k]; + } + return vInfo; +} + +/**Function************************************************************* + + Synopsis [Returns 1 if A v B is always true based on the siminfo.] + + Description [A v B is always true iff A' * B' is always false.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManCheckClauseUsingSimInfo( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 ) +{ + int fCompl1, fCompl2, i; + + fCompl1 = 1 ^ Fraig_IsComplement(pNode1) ^ Fraig_Regular(pNode1)->fInv; + fCompl2 = 1 ^ Fraig_IsComplement(pNode2) ^ Fraig_Regular(pNode2)->fInv; + + pNode1 = Fraig_Regular(pNode1); + pNode2 = Fraig_Regular(pNode2); + assert( pNode1 != pNode2 ); + + // check the simulation info + if ( fCompl1 && fCompl2 ) + { + for ( i = 0; i < p->nWordsRand; i++ ) + if ( ~pNode1->puSimR[i] & ~pNode2->puSimR[i] ) + return 0; + for ( i = 0; i < p->iWordStart; i++ ) + if ( ~pNode1->puSimD[i] & ~pNode2->puSimD[i] ) + return 0; + return 1; + } + if ( !fCompl1 && fCompl2 ) + { + for ( i = 0; i < p->nWordsRand; i++ ) + if ( pNode1->puSimR[i] & ~pNode2->puSimR[i] ) + return 0; + for ( i = 0; i < p->iWordStart; i++ ) + if ( pNode1->puSimD[i] & ~pNode2->puSimD[i] ) + return 0; + return 1; + } + if ( fCompl1 && !fCompl2 ) + { + for ( i = 0; i < p->nWordsRand; i++ ) + if ( ~pNode1->puSimR[i] & pNode2->puSimR[i] ) + return 0; + for ( i = 0; i < p->iWordStart; i++ ) + if ( ~pNode1->puSimD[i] & pNode2->puSimD[i] ) + return 0; + return 1; + } +// if ( fCompl1 && fCompl2 ) + { + for ( i = 0; i < p->nWordsRand; i++ ) + if ( pNode1->puSimR[i] & pNode2->puSimR[i] ) + return 0; + for ( i = 0; i < p->iWordStart; i++ ) + if ( pNode1->puSimD[i] & pNode2->puSimD[i] ) + return 0; + return 1; + } +} + +/**Function************************************************************* + + Synopsis [Adds clauses to the solver.] + + Description [This procedure is used to add external clauses to the solver. + The clauses are given by sets of nodes. Each node stands for one literal. + If the node is complemented, the literal is negated.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManAddClause( Fraig_Man_t * p, Fraig_Node_t ** ppNodes, int nNodes ) +{ + Fraig_Node_t * pNode; + int i, fComp, RetValue; + if ( p->pSat == NULL ) + Fraig_ManCreateSolver( p ); + // create four clauses + Msat_IntVecClear( p->vProj ); + for ( i = 0; i < nNodes; i++ ) + { + pNode = Fraig_Regular(ppNodes[i]); + fComp = Fraig_IsComplement(ppNodes[i]); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, fComp) ); +// printf( "%d(%d) ", pNode->Num, fComp ); + } +// printf( "\n" ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + diff --git a/src/sat/fraig/fraigMem.c b/src/sat/fraig/fraigMem.c new file mode 100644 index 00000000..500431c6 --- /dev/null +++ b/src/sat/fraig/fraigMem.c @@ -0,0 +1,246 @@ +/**CFile**************************************************************** + + FileName [fraigMem.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Fixed-size-entry memory manager for the FRAIG package.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigMem.c,v 1.4 2005/07/08 01:01:31 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +struct Fraig_MemFixed_t_ +{ + // information about individual entries + int nEntrySize; // the size of one entry + int nEntriesAlloc; // the total number of entries allocated + int nEntriesUsed; // the number of entries in use + int nEntriesMax; // the max number of entries in use + char * pEntriesFree; // the linked list of free entries + + // this is where the memory is stored + int nChunkSize; // the size of one chunk + int nChunksAlloc; // the maximum number of memory chunks + int nChunks; // the current number of memory chunks + char ** pChunks; // the allocated memory + + // statistics + int nMemoryUsed; // memory used in the allocated entries + int nMemoryAlloc; // memory allocated +}; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Starts the internal memory manager.] + + Description [Can only work with entry size at least 4 byte long.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_MemFixed_t * Fraig_MemFixedStart( int nEntrySize ) +{ + Fraig_MemFixed_t * p; + + p = ALLOC( Fraig_MemFixed_t, 1 ); + memset( p, 0, sizeof(Fraig_MemFixed_t) ); + + p->nEntrySize = nEntrySize; + p->nEntriesAlloc = 0; + p->nEntriesUsed = 0; + p->pEntriesFree = NULL; + + if ( nEntrySize * (1 << 10) < (1<<16) ) + p->nChunkSize = (1 << 10); + else + p->nChunkSize = (1<<16) / nEntrySize; + if ( p->nChunkSize < 8 ) + p->nChunkSize = 8; + + p->nChunksAlloc = 64; + p->nChunks = 0; + p->pChunks = ALLOC( char *, p->nChunksAlloc ); + + p->nMemoryUsed = 0; + p->nMemoryAlloc = 0; + return p; +} + +/**Function************************************************************* + + Synopsis [Stops the internal memory manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_MemFixedStop( Fraig_MemFixed_t * p, int fVerbose ) +{ + int i; + if ( p == NULL ) + return; + if ( fVerbose ) + { + printf( "Fixed memory manager: Entry = %5d. Chunk = %5d. Chunks used = %5d.\n", + p->nEntrySize, p->nChunkSize, p->nChunks ); + printf( " Entries used = %8d. Entries peak = %8d. Memory used = %8d. Memory alloc = %8d.\n", + p->nEntriesUsed, p->nEntriesMax, p->nEntrySize * p->nEntriesUsed, p->nMemoryAlloc ); + } + for ( i = 0; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + free( p->pChunks ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Extracts one entry from the memory manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Fraig_MemFixedEntryFetch( Fraig_MemFixed_t * p ) +{ + char * pTemp; + int i; + + // check if there are still free entries + if ( p->nEntriesUsed == p->nEntriesAlloc ) + { // need to allocate more entries + assert( p->pEntriesFree == NULL ); + if ( p->nChunks == p->nChunksAlloc ) + { + p->nChunksAlloc *= 2; + p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); + } + p->pEntriesFree = ALLOC( char, p->nEntrySize * p->nChunkSize ); + p->nMemoryAlloc += p->nEntrySize * p->nChunkSize; + // transform these entries into a linked list + pTemp = p->pEntriesFree; + for ( i = 1; i < p->nChunkSize; i++ ) + { + *((char **)pTemp) = pTemp + p->nEntrySize; + pTemp += p->nEntrySize; + } + // set the last link + *((char **)pTemp) = NULL; + // add the chunk to the chunk storage + p->pChunks[ p->nChunks++ ] = p->pEntriesFree; + // add to the number of entries allocated + p->nEntriesAlloc += p->nChunkSize; + } + // incrememt the counter of used entries + p->nEntriesUsed++; + if ( p->nEntriesMax < p->nEntriesUsed ) + p->nEntriesMax = p->nEntriesUsed; + // return the first entry in the free entry list + pTemp = p->pEntriesFree; + p->pEntriesFree = *((char **)pTemp); + return pTemp; +} + +/**Function************************************************************* + + Synopsis [Returns one entry into the memory manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_MemFixedEntryRecycle( Fraig_MemFixed_t * p, char * pEntry ) +{ + // decrement the counter of used entries + p->nEntriesUsed--; + // add the entry to the linked list of free entries + *((char **)pEntry) = p->pEntriesFree; + p->pEntriesFree = pEntry; +} + +/**Function************************************************************* + + Synopsis [Frees all associated memory and resets the manager.] + + Description [Relocates all the memory except the first chunk.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_MemFixedRestart( Fraig_MemFixed_t * p ) +{ + int i; + char * pTemp; + + // deallocate all chunks except the first one + for ( i = 1; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + p->nChunks = 1; + // transform these entries into a linked list + pTemp = p->pChunks[0]; + for ( i = 1; i < p->nChunkSize; i++ ) + { + *((char **)pTemp) = pTemp + p->nEntrySize; + pTemp += p->nEntrySize; + } + // set the last link + *((char **)pTemp) = NULL; + // set the free entry list + p->pEntriesFree = p->pChunks[0]; + // set the correct statistics + p->nMemoryAlloc = p->nEntrySize * p->nChunkSize; + p->nMemoryUsed = 0; + p->nEntriesAlloc = p->nChunkSize; + p->nEntriesUsed = 0; +} + +/**Function************************************************************* + + Synopsis [Reports the memory usage.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_MemFixedReadMemUsage( Fraig_MemFixed_t * p ) +{ + return p->nMemoryAlloc; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigNode.c b/src/sat/fraig/fraigNode.c new file mode 100644 index 00000000..6e3d3c7d --- /dev/null +++ b/src/sat/fraig/fraigNode.c @@ -0,0 +1,313 @@ +/**CFile**************************************************************** + + FileName [fraigNode.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Implementation of the FRAIG node.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigNode.c,v 1.3 2005/07/08 01:01:32 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +// returns the complemented attribute of the node +#define Fraig_NodeIsSimComplement(p) (Fraig_IsComplement(p)? !(Fraig_Regular(p)->fInv) : (p)->fInv) + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Creates the constant 1 node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeCreateConst( Fraig_Man_t * p ) +{ + Fraig_Node_t * pNode; + + // create the node + pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes ); + memset( pNode, 0, sizeof(Fraig_Node_t) ); + + // assign the number and add to the array of nodes + pNode->Num = p->vNodes->nSize; + Fraig_NodeVecPush( p->vNodes, pNode ); + pNode->NumPi = -1; // this is not a PI, so its number is -1 + pNode->Level = 0; // just like a PI, it has 0 level + pNode->nRefs = 1; // it is a persistent node, which comes referenced + pNode->fInv = 1; // the simulation info is complemented + + // create the simulation info + pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims ); + pNode->puSimD = pNode->puSimR + p->nWordsRand; + memset( pNode->puSimR, 0, sizeof(unsigned) * p->nWordsRand ); + memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna ); + + // count the number of ones in the simulation vector + pNode->nOnes = p->nWordsRand * sizeof(unsigned) * 8; + + // insert it into the hash table + Fraig_HashTableLookupF0( p, pNode ); + return pNode; +} + +/**Function************************************************************* + + Synopsis [Creates a primary input node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeCreatePi( Fraig_Man_t * p ) +{ + Fraig_Node_t * pNode, * pNodeRes; + int i, clk; + + // create the node + pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes ); + memset( pNode, 0, sizeof(Fraig_Node_t) ); + pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims ); + pNode->puSimD = pNode->puSimR + p->nWordsRand; + memset( pNode->puSimD, 0, sizeof(unsigned) * p->nWordsDyna ); + + // assign the number and add to the array of nodes + pNode->Num = p->vNodes->nSize; + Fraig_NodeVecPush( p->vNodes, pNode ); + + // assign the PI number and add to the array of primary inputs + pNode->NumPi = p->vInputs->nSize; + Fraig_NodeVecPush( p->vInputs, pNode ); + + pNode->Level = 0; // PI has 0 level + pNode->nRefs = 1; // it is a persistent node, which comes referenced + pNode->fInv = 0; // the simulation info of the PI is not complemented + + // derive the simulation info for the new node +clk = clock(); + // set the random simulation info for the primary input + pNode->uHashR = 0; + for ( i = 0; i < p->nWordsRand; i++ ) + { + // generate the simulation info + pNode->puSimR[i] = FRAIG_RANDOM_UNSIGNED; + // for reasons that take very long to explain, it makes sense to have (0000000...) + // pattern in the set (this helps if we need to return the counter-examples) + if ( i == 0 ) + pNode->puSimR[i] <<= 1; + // compute the hash key + pNode->uHashR ^= pNode->puSimR[i] * s_FraigPrimes[i]; + } + // count the number of ones in the simulation vector + pNode->nOnes = Fraig_BitStringCountOnes( pNode->puSimR, p->nWordsRand ); + + // set the systematic simulation info for the primary input + pNode->uHashD = 0; + for ( i = 0; i < p->iWordStart; i++ ) + { + // generate the simulation info + pNode->puSimD[i] = FRAIG_RANDOM_UNSIGNED; + // compute the hash key + pNode->uHashD ^= pNode->puSimD[i] * s_FraigPrimes[i]; + } +p->timeSims += clock() - clk; + + // insert it into the hash table + pNodeRes = Fraig_HashTableLookupF( p, pNode ); + assert( pNodeRes == NULL ); + // add to the runtime of simulation + return pNode; +} + +/**Function************************************************************* + + Synopsis [Creates a new node.] + + Description [This procedure should be called to create the constant + node and the PI nodes first.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeCreate( Fraig_Man_t * p, Fraig_Node_t * p1, Fraig_Node_t * p2 ) +{ + Fraig_Node_t * pNode; + int clk; + + // create the node + pNode = (Fraig_Node_t *)Fraig_MemFixedEntryFetch( p->mmNodes ); + memset( pNode, 0, sizeof(Fraig_Node_t) ); + + // assign the children + pNode->p1 = p1; Fraig_Ref(p1); Fraig_Regular(p1)->nRefs++; + pNode->p2 = p2; Fraig_Ref(p2); Fraig_Regular(p2)->nRefs++; + + // assign the number and add to the array of nodes + pNode->Num = p->vNodes->nSize; + Fraig_NodeVecPush( p->vNodes, pNode ); + + // assign the PI number + pNode->NumPi = -1; + + // compute the level of this node + pNode->Level = 1 + FRAIG_MAX(Fraig_Regular(p1)->Level, Fraig_Regular(p2)->Level); + pNode->fInv = Fraig_NodeIsSimComplement(p1) & Fraig_NodeIsSimComplement(p2); + pNode->fFailTfo = Fraig_Regular(p1)->fFailTfo | Fraig_Regular(p2)->fFailTfo; + + // derive the simulation info +clk = clock(); + // allocate memory for the simulation info + pNode->puSimR = (unsigned *)Fraig_MemFixedEntryFetch( p->mmSims ); + pNode->puSimD = pNode->puSimR + p->nWordsRand; + // derive random simulation info + pNode->uHashR = 0; + Fraig_NodeSimulate( pNode, 0, p->nWordsRand, 1 ); + // derive dynamic simulation info + pNode->uHashD = 0; + Fraig_NodeSimulate( pNode, 0, p->iWordStart, 0 ); + // count the number of ones in the random simulation info + pNode->nOnes = Fraig_BitStringCountOnes( pNode->puSimR, p->nWordsRand ); + if ( pNode->fInv ) + pNode->nOnes = p->nWordsRand * 32 - pNode->nOnes; + // add to the runtime of simulation +p->timeSims += clock() - clk; + +#ifdef FRAIG_ENABLE_FANOUTS + // create the fanout info + Fraig_NodeAddFaninFanout( Fraig_Regular(p1), pNode ); + Fraig_NodeAddFaninFanout( Fraig_Regular(p2), pNode ); +#endif + return pNode; +} + + +/**Function************************************************************* + + Synopsis [Simulates the node.] + + Description [Simulates the random or dynamic simulation info through + the node. Uses phases of the children to determine their real simulation + info. Uses phase of the node to determine the way its simulation info + is stored. The resulting info is guaranteed to be 0 for the first pattern.] + + SideEffects [This procedure modified the hash value of the simulation info.] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeSimulate( Fraig_Node_t * pNode, int iWordStart, int iWordStop, int fUseRand ) +{ + unsigned * pSims, * pSims1, * pSims2; + unsigned uHash; + int fCompl, fCompl1, fCompl2, i; + + assert( !Fraig_IsComplement(pNode) ); + + // get hold of the simulation information + pSims = fUseRand? pNode->puSimR : pNode->puSimD; + pSims1 = fUseRand? Fraig_Regular(pNode->p1)->puSimR : Fraig_Regular(pNode->p1)->puSimD; + pSims2 = fUseRand? Fraig_Regular(pNode->p2)->puSimR : Fraig_Regular(pNode->p2)->puSimD; + + // get complemented attributes of the children using their random info + fCompl = pNode->fInv; + fCompl1 = Fraig_NodeIsSimComplement(pNode->p1); + fCompl2 = Fraig_NodeIsSimComplement(pNode->p2); + + // simulate + uHash = 0; + if ( fCompl1 && fCompl2 ) + { + if ( fCompl ) + for ( i = iWordStart; i < iWordStop; i++ ) + { + pSims[i] = (pSims1[i] | pSims2[i]); + uHash ^= pSims[i] * s_FraigPrimes[i]; + } + else + for ( i = iWordStart; i < iWordStop; i++ ) + { + pSims[i] = ~(pSims1[i] | pSims2[i]); + uHash ^= pSims[i] * s_FraigPrimes[i]; + } + } + else if ( fCompl1 && !fCompl2 ) + { + if ( fCompl ) + for ( i = iWordStart; i < iWordStop; i++ ) + { + pSims[i] = (pSims1[i] | ~pSims2[i]); + uHash ^= pSims[i] * s_FraigPrimes[i]; + } + else + for ( i = iWordStart; i < iWordStop; i++ ) + { + pSims[i] = (~pSims1[i] & pSims2[i]); + uHash ^= pSims[i] * s_FraigPrimes[i]; + } + } + else if ( !fCompl1 && fCompl2 ) + { + if ( fCompl ) + for ( i = iWordStart; i < iWordStop; i++ ) + { + pSims[i] = (~pSims1[i] | pSims2[i]); + uHash ^= pSims[i] * s_FraigPrimes[i]; + } + else + for ( i = iWordStart; i < iWordStop; i++ ) + { + pSims[i] = (pSims1[i] & ~pSims2[i]); + uHash ^= pSims[i] * s_FraigPrimes[i]; + } + } + else // if ( !fCompl1 && !fCompl2 ) + { + if ( fCompl ) + for ( i = iWordStart; i < iWordStop; i++ ) + { + pSims[i] = ~(pSims1[i] & pSims2[i]); + uHash ^= pSims[i] * s_FraigPrimes[i]; + } + else + for ( i = iWordStart; i < iWordStop; i++ ) + { + pSims[i] = (pSims1[i] & pSims2[i]); + uHash ^= pSims[i] * s_FraigPrimes[i]; + } + } + + if ( fUseRand ) + pNode->uHashR ^= uHash; + else + pNode->uHashD ^= uHash; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + diff --git a/src/sat/fraig/fraigPrime.c b/src/sat/fraig/fraigPrime.c new file mode 100644 index 00000000..127ad478 --- /dev/null +++ b/src/sat/fraig/fraigPrime.c @@ -0,0 +1,144 @@ +/**CFile**************************************************************** + + FileName [fraigPrime.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [The table of the first 1000 primes.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigPrime.c,v 1.4 2005/07/08 01:01:32 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +// The 1,024 smallest prime numbers used to compute the hash value +// http://www.math.utah.edu/~alfeld/math/primelist.html +int s_FraigPrimes[FRAIG_MAX_PRIMES] = { 2, 3, 5, +7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, +101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, +193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, +293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, +409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, +521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, +641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, +757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, +881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997, +1009, 1013, 1019, 1021, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069, 1087, 1091, +1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1187, 1193, +1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, +1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, 1367, 1373, 1381, 1399, 1409, 1423, +1427, 1429, 1433, 1439, 1447, 1451, 1453, 1459, 1471, 1481, 1483, 1487, 1489, 1493, +1499, 1511, 1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, 1597, 1601, +1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667, 1669, 1693, 1697, 1699, +1709, 1721, 1723, 1733, 1741, 1747, 1753, 1759, 1777, 1783, 1787, 1789, 1801, 1811, +1823, 1831, 1847, 1861, 1867, 1871, 1873, 1877, 1879, 1889, 1901, 1907, 1913, 1931, +1933, 1949, 1951, 1973, 1979, 1987, 1993, 1997, 1999, 2003, 2011, 2017, 2027, 2029, +2039, 2053, 2063, 2069, 2081, 2083, 2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, +2141, 2143, 2153, 2161, 2179, 2203, 2207, 2213, 2221, 2237, 2239, 2243, 2251, 2267, +2269, 2273, 2281, 2287, 2293, 2297, 2309, 2311, 2333, 2339, 2341, 2347, 2351, 2357, +2371, 2377, 2381, 2383, 2389, 2393, 2399, 2411, 2417, 2423, 2437, 2441, 2447, 2459, +2467, 2473, 2477, 2503, 2521, 2531, 2539, 2543, 2549, 2551, 2557, 2579, 2591, 2593, +2609, 2617, 2621, 2633, 2647, 2657, 2659, 2663, 2671, 2677, 2683, 2687, 2689, 2693, +2699, 2707, 2711, 2713, 2719, 2729, 2731, 2741, 2749, 2753, 2767, 2777, 2789, 2791, +2797, 2801, 2803, 2819, 2833, 2837, 2843, 2851, 2857, 2861, 2879, 2887, 2897, 2903, +2909, 2917, 2927, 2939, 2953, 2957, 2963, 2969, 2971, 2999, 3001, 3011, 3019, 3023, +3037, 3041, 3049, 3061, 3067, 3079, 3083, 3089, 3109, 3119, 3121, 3137, 3163, 3167, +3169, 3181, 3187, 3191, 3203, 3209, 3217, 3221, 3229, 3251, 3253, 3257, 3259, 3271, +3299, 3301, 3307, 3313, 3319, 3323, 3329, 3331, 3343, 3347, 3359, 3361, 3371, 3373, +3389, 3391, 3407, 3413, 3433, 3449, 3457, 3461, 3463, 3467, 3469, 3491, 3499, 3511, +3517, 3527, 3529, 3533, 3539, 3541, 3547, 3557, 3559, 3571, 3581, 3583, 3593, 3607, +3613, 3617, 3623, 3631, 3637, 3643, 3659, 3671, 3673, 3677, 3691, 3697, 3701, 3709, +3719, 3727, 3733, 3739, 3761, 3767, 3769, 3779, 3793, 3797, 3803, 3821, 3823, 3833, +3847, 3851, 3853, 3863, 3877, 3881, 3889, 3907, 3911, 3917, 3919, 3923, 3929, 3931, +3943, 3947, 3967, 3989, 4001, 4003, 4007, 4013, 4019, 4021, 4027, 4049, 4051, 4057, +4073, 4079, 4091, 4093, 4099, 4111, 4127, 4129, 4133, 4139, 4153, 4157, 4159, 4177, +4201, 4211, 4217, 4219, 4229, 4231, 4241, 4243, 4253, 4259, 4261, 4271, 4273, 4283, +4289, 4297, 4327, 4337, 4339, 4349, 4357, 4363, 4373, 4391, 4397, 4409, 4421, 4423, +4441, 4447, 4451, 4457, 4463, 4481, 4483, 4493, 4507, 4513, 4517, 4519, 4523, 4547, +4549, 4561, 4567, 4583, 4591, 4597, 4603, 4621, 4637, 4639, 4643, 4649, 4651, 4657, +4663, 4673, 4679, 4691, 4703, 4721, 4723, 4729, 4733, 4751, 4759, 4783, 4787, 4789, +4793, 4799, 4801, 4813, 4817, 4831, 4861, 4871, 4877, 4889, 4903, 4909, 4919, 4931, +4933, 4937, 4943, 4951, 4957, 4967, 4969, 4973, 4987, 4993, 4999, 5003, 5009, 5011, +5021, 5023, 5039, 5051, 5059, 5077, 5081, 5087, 5099, 5101, 5107, 5113, 5119, 5147, +5153, 5167, 5171, 5179, 5189, 5197, 5209, 5227, 5231, 5233, 5237, 5261, 5273, 5279, +5281, 5297, 5303, 5309, 5323, 5333, 5347, 5351, 5381, 5387, 5393, 5399, 5407, 5413, +5417, 5419, 5431, 5437, 5441, 5443, 5449, 5471, 5477, 5479, 5483, 5501, 5503, 5507, +5519, 5521, 5527, 5531, 5557, 5563, 5569, 5573, 5581, 5591, 5623, 5639, 5641, 5647, +5651, 5653, 5657, 5659, 5669, 5683, 5689, 5693, 5701, 5711, 5717, 5737, 5741, 5743, +5749, 5779, 5783, 5791, 5801, 5807, 5813, 5821, 5827, 5839, 5843, 5849, 5851, 5857, +5861, 5867, 5869, 5879, 5881, 5897, 5903, 5923, 5927, 5939, 5953, 5981, 5987, 6007, +6011, 6029, 6037, 6043, 6047, 6053, 6067, 6073, 6079, 6089, 6091, 6101, 6113, 6121, +6131, 6133, 6143, 6151, 6163, 6173, 6197, 6199, 6203, 6211, 6217, 6221, 6229, 6247, +6257, 6263, 6269, 6271, 6277, 6287, 6299, 6301, 6311, 6317, 6323, 6329, 6337, 6343, +6353, 6359, 6361, 6367, 6373, 6379, 6389, 6397, 6421, 6427, 6449, 6451, 6469, 6473, +6481, 6491, 6521, 6529, 6547, 6551, 6553, 6563, 6569, 6571, 6577, 6581, 6599, 6607, +6619, 6637, 6653, 6659, 6661, 6673, 6679, 6689, 6691, 6701, 6703, 6709, 6719, 6733, +6737, 6761, 6763, 6779, 6781, 6791, 6793, 6803, 6823, 6827, 6829, 6833, 6841, 6857, +6863, 6869, 6871, 6883, 6899, 6907, 6911, 6917, 6947, 6949, 6959, 6961, 6967, 6971, +6977, 6983, 6991, 6997, 7001, 7013, 7019, 7027, 7039, 7043, 7057, 7069, 7079, 7103, +7109, 7121, 7127, 7129, 7151, 7159, 7177, 7187, 7193, 7207, 7211, 7213, 7219, 7229, +7237, 7243, 7247, 7253, 7283, 7297, 7307, 7309, 7321, 7331, 7333, 7349, 7351, 7369, +7393, 7411, 7417, 7433, 7451, 7457, 7459, 7477, 7481, 7487, 7489, 7499, 7507, 7517, +7523, 7529, 7537, 7541, 7547, 7549, 7559, 7561, 7573, 7577, 7583, 7589, 7591, 7603, +7607, 7621, 7639, 7643, 7649, 7669, 7673, 7681, 7687, 7691, 7699, 7703, 7717, 7723, +7727, 7741, 7753, 7757, 7759, 7789, 7793, 7817, 7823, 7829, 7841, 7853, 7867, 7873, +7877, 7879, 7883, 7901, 7907, 7919, 7927, 7933, 7937, 7949, 7951, 7963, 7993, 8009, +8011, 8017, 8039, 8053, 8059, 8069, 8081, 8087, 8089, 8093, 8101, 8111, 8117, 8123, +8147, 8161 }; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function******************************************************************** + + Synopsis [Returns the next prime >= p.] + + Description [Copied from CUDD, for stand-aloneness.] + + SideEffects [None] + + SeeAlso [] + +******************************************************************************/ +unsigned int Cudd_PrimeFraig( unsigned int p) +{ + int i,pn; + + p--; + do { + p++; + if (p&1) { + pn = 1; + i = 3; + while ((unsigned) (i * i) <= p) { + if (p % i == 0) { + pn = 0; + break; + } + i += 2; + } + } else { + pn = 0; + } + } while (!pn); + return(p); + +} /* end of Cudd_Prime */ + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigSat.c b/src/sat/fraig/fraigSat.c new file mode 100644 index 00000000..53057fc3 --- /dev/null +++ b/src/sat/fraig/fraigSat.c @@ -0,0 +1,1455 @@ +/**CFile**************************************************************** + + FileName [fraigSat.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Proving functional equivalence using SAT.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigSat.c,v 1.10 2005/07/08 01:01:32 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" +#include "math.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static void Fraig_OrderVariables( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ); +static void Fraig_SetupAdjacent( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars ); +static void Fraig_SetupAdjacentMark( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars ); +static void Fraig_PrepareCones( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ); +static void Fraig_PrepareCones_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); + +static void Fraig_SupergateAddClauses( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper ); +static void Fraig_SupergateAddClausesExor( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +static void Fraig_SupergateAddClausesMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +//static void Fraig_DetectFanoutFreeCone( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +static void Fraig_DetectFanoutFreeConeMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode ); +static void Fraig_SetActivity( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ); + +extern void * Msat_ClauseVecReadEntry( void * p, int i ); + +// The lesson learned seems to be that variable should be in reverse topological order +// from the output of the miter. The ordering of adjacency lists is very important. +// The best way seems to be fanins followed by fanouts. Slight changes to this order +// leads to big degradation in quality. + +static int nMuxes; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Checks equivalence of two nodes.] + + Description [Returns 1 iff the nodes are equivalent.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodesAreEqual( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit, int nTimeLimit ) +{ + if ( pNode1 == pNode2 ) + return 1; + if ( pNode1 == Fraig_Not(pNode2) ) + return 0; + return Fraig_NodeIsEquivalent( p, Fraig_Regular(pNode1), Fraig_Regular(pNode2), nBTLimit, nTimeLimit ); +} + +/**Function************************************************************* + + Synopsis [Tries to prove the final miter.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManProveMiter( Fraig_Man_t * p ) +{ + Fraig_Node_t * pNode; + int i, clk; + + if ( !p->fTryProve ) + return; + + clk = clock(); + // consider all outputs of the multi-output miter + for ( i = 0; i < p->vOutputs->nSize; i++ ) + { + pNode = Fraig_Regular(p->vOutputs->pArray[i]); + // skip already constant nodes + if ( pNode == p->pConst1 ) + continue; + // skip nodes that are different according to simulation + if ( !Fraig_CompareSimInfo( pNode, p->pConst1, p->nWordsRand, 1 ) ) + continue; + if ( Fraig_NodeIsEquivalent( p, p->pConst1, pNode, -1, p->nSeconds ) ) + { + if ( Fraig_IsComplement(p->vOutputs->pArray[i]) ^ Fraig_NodeComparePhase(p->pConst1, pNode) ) + p->vOutputs->pArray[i] = Fraig_Not(p->pConst1); + else + p->vOutputs->pArray[i] = p->pConst1; + } + } + if ( p->fVerboseP ) + { +// PRT( "Final miter proof time", clock() - clk ); + } +} + +/**Function************************************************************* + + Synopsis [Returns 1 if the miter is unsat; 0 if sat; -1 if undecided.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManCheckMiter( Fraig_Man_t * p ) +{ + Fraig_Node_t * pNode; + int i; + FREE( p->pModel ); + for ( i = 0; i < p->vOutputs->nSize; i++ ) + { + // get the output node (it can be complemented!) + pNode = p->vOutputs->pArray[i]; + // if the miter is constant 0, the problem is UNSAT + if ( pNode == Fraig_Not(p->pConst1) ) + continue; + // consider the special case when the miter is constant 1 + if ( pNode == p->pConst1 ) + { + // in this case, any counter example will do to distinquish it from constant 0 + // here we pick the counter example composed of all zeros + p->pModel = Fraig_ManAllocCounterExample( p ); + return 0; + } + // save the counter example + p->pModel = Fraig_ManSaveCounterExample( p, pNode ); + // if the model is not found, return undecided + if ( p->pModel == NULL ) + return -1; + else + return 0; + } + return 1; +} + + +/**Function************************************************************* + + Synopsis [Returns 1 if pOld is in the TFI of pNew.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_MarkTfi_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + // skip the visited node + if ( pNode->TravId == pMan->nTravIds ) + return 0; + pNode->TravId = pMan->nTravIds; + // skip the PI node + if ( pNode->NumPi >= 0 ) + return 1; + // check the children + return Fraig_MarkTfi_rec( pMan, Fraig_Regular(pNode->p1) ) + + Fraig_MarkTfi_rec( pMan, Fraig_Regular(pNode->p2) ); +} + +/**Function************************************************************* + + Synopsis [Returns 1 if pOld is in the TFI of pNew.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_MarkTfi2_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + // skip the visited node + if ( pNode->TravId == pMan->nTravIds ) + return 0; + // skip the boundary node + if ( pNode->TravId == pMan->nTravIds-1 ) + { + pNode->TravId = pMan->nTravIds; + return 1; + } + pNode->TravId = pMan->nTravIds; + // skip the PI node + if ( pNode->NumPi >= 0 ) + return 1; + // check the children + return Fraig_MarkTfi2_rec( pMan, Fraig_Regular(pNode->p1) ) + + Fraig_MarkTfi2_rec( pMan, Fraig_Regular(pNode->p2) ); +} + +/**Function************************************************************* + + Synopsis [Returns 1 if pOld is in the TFI of pNew.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_MarkTfi3_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + // skip the visited node + if ( pNode->TravId == pMan->nTravIds ) + return 1; + // skip the boundary node + if ( pNode->TravId == pMan->nTravIds-1 ) + { + pNode->TravId = pMan->nTravIds; + return 1; + } + pNode->TravId = pMan->nTravIds; + // skip the PI node + if ( pNode->NumPi >= 0 ) + return 0; + // check the children + return Fraig_MarkTfi3_rec( pMan, Fraig_Regular(pNode->p1) ) * + Fraig_MarkTfi3_rec( pMan, Fraig_Regular(pNode->p2) ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_VarsStudy( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ + int NumPis, NumCut, fContain; + + // mark the TFI of pNew + p->nTravIds++; + NumPis = Fraig_MarkTfi_rec( p, pNew ); + printf( "(%d)(%d,%d):", NumPis, pOld->Level, pNew->Level ); + + // check if the old is in the TFI + if ( pOld->TravId == p->nTravIds ) + { + printf( "* " ); + return; + } + + // count the boundary of nodes in pOld + p->nTravIds++; + NumCut = Fraig_MarkTfi2_rec( p, pOld ); + printf( "%d", NumCut ); + + // check if the new is contained in the old's support + p->nTravIds++; + fContain = Fraig_MarkTfi3_rec( p, pNew ); + printf( "%c ", fContain? '+':'-' ); +} + + +/**Function************************************************************* + + Synopsis [Checks whether two nodes are functinally equivalent.] + + Description [The flag (fComp) tells whether the nodes to be checked + are in the opposite polarity. The second flag (fSkipZeros) tells whether + the checking should be performed if the simulation vectors are zeros. + Returns 1 if the nodes are equivalent; 0 othewise.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsEquivalent( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit, int nTimeLimit ) +{ + int RetValue, RetValue1, i, fComp, clk; + int fVerbose = 0; + int fSwitch = 0; + + // make sure the nodes are not complemented + assert( !Fraig_IsComplement(pNew) ); + assert( !Fraig_IsComplement(pOld) ); + assert( pNew != pOld ); + + // if at least one of the nodes is a failed node, perform adjustments: + // if the backtrack limit is small, simply skip this node + // if the backtrack limit is > 10, take the quare root of the limit + if ( nBTLimit > 0 && (pOld->fFailTfo || pNew->fFailTfo) ) + { + p->nSatFails++; +// return 0; +// if ( nBTLimit > 10 ) +// nBTLimit /= 10; + if ( nBTLimit <= 10 ) + return 0; + nBTLimit = (int)sqrt(nBTLimit); +// fSwitch = 1; + } + + p->nSatCalls++; + + // make sure the solver is allocated and has enough variables + if ( p->pSat == NULL ) + Fraig_ManCreateSolver( p ); + // make sure the SAT solver has enough variables + for ( i = Msat_SolverReadVarNum(p->pSat); i < p->vNodes->nSize; i++ ) + Msat_SolverAddVar( p->pSat, p->vNodes->pArray[i]->Level ); + + + +/* + { + Fraig_Node_t * ppNodes[2] = { pOld, pNew }; + extern void Fraig_MappingShowNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppRoots, int nRoots, char * pFileName ); + Fraig_MappingShowNodes( p, ppNodes, 2, "temp_aig" ); + } +*/ + + nMuxes = 0; + + + // get the logic cone +clk = clock(); +// Fraig_VarsStudy( p, pOld, pNew ); + Fraig_OrderVariables( p, pOld, pNew ); +// Fraig_PrepareCones( p, pOld, pNew ); +p->timeTrav += clock() - clk; + +// printf( "The number of MUXes detected = %d (%5.2f %% of logic). ", nMuxes, 300.0*nMuxes/(p->vNodes->nSize - p->vInputs->nSize) ); +// PRT( "Time", clock() - clk ); + +if ( fVerbose ) + printf( "%d(%d) - ", Fraig_CountPis(p,p->vVarsInt), Msat_IntVecReadSize(p->vVarsInt) ); + + + // prepare variable activity + Fraig_SetActivity( p, pOld, pNew ); + + // get the complemented attribute + fComp = Fraig_NodeComparePhase( pOld, pNew ); +//Msat_SolverPrintClauses( p->pSat ); + + //////////////////////////////////////////// + // prepare the solver to run incrementally on these variables +//clk = clock(); + Msat_SolverPrepare( p->pSat, p->vVarsInt ); +//p->time3 += clock() - clk; + + + // solve under assumptions + // A = 1; B = 0 OR A = 1; B = 1 + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) ); + +//Msat_SolverWriteDimacs( p->pSat, "temp_fraig.cnf" ); + + // run the solver +clk = clock(); + RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit, nTimeLimit ); +p->timeSat += clock() - clk; + + if ( RetValue1 == MSAT_FALSE ) + { +//p->time1 += clock() - clk; + +if ( fVerbose ) +{ + printf( "unsat %d ", Msat_SolverReadBackTracks(p->pSat) ); +PRT( "time", clock() - clk ); +} + + // add the clause + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + // continue solving the other implication + } + else if ( RetValue1 == MSAT_TRUE ) + { +//p->time2 += clock() - clk; + +if ( fVerbose ) +{ + printf( "sat %d ", Msat_SolverReadBackTracks(p->pSat) ); +PRT( "time", clock() - clk ); +} + + // record the counter example + Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew ); + +// if ( pOld->fFailTfo || pNew->fFailTfo ) +// printf( "*" ); +// printf( "s(%d)", pNew->Level ); + if ( fSwitch ) + printf( "s(%d)", pNew->Level ); + p->nSatCounter++; + return 0; + } + else // if ( RetValue1 == MSAT_UNKNOWN ) + { +p->time3 += clock() - clk; + +// if ( pOld->fFailTfo || pNew->fFailTfo ) +// printf( "*" ); +// printf( "T(%d)", pNew->Level ); + + // mark the node as the failed node + if ( pOld != p->pConst1 ) + pOld->fFailTfo = 1; + pNew->fFailTfo = 1; +// p->nSatFails++; + if ( fSwitch ) + printf( "T(%d)", pNew->Level ); + p->nSatFailsReal++; + return 0; + } + + // if the old node was constant 0, we already know the answer + if ( pOld == p->pConst1 ) + return 1; + + //////////////////////////////////////////// + // prepare the solver to run incrementally +//clk = clock(); + Msat_SolverPrepare( p->pSat, p->vVarsInt ); +//p->time3 += clock() - clk; + // solve under assumptions + // A = 0; B = 1 OR A = 0; B = 0 + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) ); + // run the solver +clk = clock(); + RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit, nTimeLimit ); +p->timeSat += clock() - clk; + + if ( RetValue1 == MSAT_FALSE ) + { +//p->time1 += clock() - clk; + +if ( fVerbose ) +{ + printf( "unsat %d ", Msat_SolverReadBackTracks(p->pSat) ); +PRT( "time", clock() - clk ); +} + + // add the clause + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + // continue solving the other implication + } + else if ( RetValue1 == MSAT_TRUE ) + { +//p->time2 += clock() - clk; + +if ( fVerbose ) +{ + printf( "sat %d ", Msat_SolverReadBackTracks(p->pSat) ); +PRT( "time", clock() - clk ); +} + + // record the counter example + Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew ); + p->nSatCounter++; + +// if ( pOld->fFailTfo || pNew->fFailTfo ) +// printf( "*" ); +// printf( "s(%d)", pNew->Level ); + if ( fSwitch ) + printf( "s(%d)", pNew->Level ); + return 0; + } + else // if ( RetValue1 == MSAT_UNKNOWN ) + { +p->time3 += clock() - clk; + +// if ( pOld->fFailTfo || pNew->fFailTfo ) +// printf( "*" ); +// printf( "T(%d)", pNew->Level ); + if ( fSwitch ) + printf( "T(%d)", pNew->Level ); + + // mark the node as the failed node + pOld->fFailTfo = 1; + pNew->fFailTfo = 1; +// p->nSatFails++; + p->nSatFailsReal++; + return 0; + } + + // return SAT proof + p->nSatProof++; + +// if ( pOld->fFailTfo || pNew->fFailTfo ) +// printf( "*" ); +// printf( "u(%d)", pNew->Level ); + + if ( fSwitch ) + printf( "u(%d)", pNew->Level ); + + return 1; +} + + +/**Function************************************************************* + + Synopsis [Checks whether pOld => pNew.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsImplication( Fraig_Man_t * p, Fraig_Node_t * pOld, Fraig_Node_t * pNew, int nBTLimit ) +{ + int RetValue, RetValue1, i, fComp, clk; + int fVerbose = 0; + + // make sure the nodes are not complemented + assert( !Fraig_IsComplement(pNew) ); + assert( !Fraig_IsComplement(pOld) ); + assert( pNew != pOld ); + + p->nSatCallsImp++; + + // make sure the solver is allocated and has enough variables + if ( p->pSat == NULL ) + Fraig_ManCreateSolver( p ); + // make sure the SAT solver has enough variables + for ( i = Msat_SolverReadVarNum(p->pSat); i < p->vNodes->nSize; i++ ) + Msat_SolverAddVar( p->pSat, p->vNodes->pArray[i]->Level ); + + // get the logic cone +clk = clock(); + Fraig_OrderVariables( p, pOld, pNew ); +// Fraig_PrepareCones( p, pOld, pNew ); +p->timeTrav += clock() - clk; + +if ( fVerbose ) + printf( "%d(%d) - ", Fraig_CountPis(p,p->vVarsInt), Msat_IntVecReadSize(p->vVarsInt) ); + + + // get the complemented attribute + fComp = Fraig_NodeComparePhase( pOld, pNew ); +//Msat_SolverPrintClauses( p->pSat ); + + //////////////////////////////////////////// + // prepare the solver to run incrementally on these variables +//clk = clock(); + Msat_SolverPrepare( p->pSat, p->vVarsInt ); +//p->time3 += clock() - clk; + + // solve under assumptions + // A = 1; B = 0 OR A = 1; B = 1 + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 0) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, !fComp) ); + // run the solver +clk = clock(); + RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit, 1000000 ); +p->timeSat += clock() - clk; + + if ( RetValue1 == MSAT_FALSE ) + { +//p->time1 += clock() - clk; + +if ( fVerbose ) +{ + printf( "unsat %d ", Msat_SolverReadBackTracks(p->pSat) ); +PRT( "time", clock() - clk ); +} + + // add the clause + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pOld->Num, 1) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNew->Num, fComp) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); +// p->nSatProofImp++; + return 1; + } + else if ( RetValue1 == MSAT_TRUE ) + { +//p->time2 += clock() - clk; + +if ( fVerbose ) +{ + printf( "sat %d ", Msat_SolverReadBackTracks(p->pSat) ); +PRT( "time", clock() - clk ); +} + // record the counter example + Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pOld, pNew ); + p->nSatCounterImp++; + return 0; + } + else // if ( RetValue1 == MSAT_UNKNOWN ) + { +p->time3 += clock() - clk; + p->nSatFailsImp++; + return 0; + } +} + +/**Function************************************************************* + + Synopsis [Prepares the SAT solver to run on the two nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManCheckClauseUsingSat( Fraig_Man_t * p, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int nBTLimit ) +{ + Fraig_Node_t * pNode1R, * pNode2R; + int RetValue, RetValue1, i, clk; + int fVerbose = 0; + + pNode1R = Fraig_Regular(pNode1); + pNode2R = Fraig_Regular(pNode2); + assert( pNode1R != pNode2R ); + + // make sure the solver is allocated and has enough variables + if ( p->pSat == NULL ) + Fraig_ManCreateSolver( p ); + // make sure the SAT solver has enough variables + for ( i = Msat_SolverReadVarNum(p->pSat); i < p->vNodes->nSize; i++ ) + Msat_SolverAddVar( p->pSat, p->vNodes->pArray[i]->Level ); + + // get the logic cone +clk = clock(); + Fraig_OrderVariables( p, pNode1R, pNode2R ); +// Fraig_PrepareCones( p, pNode1R, pNode2R ); +p->timeTrav += clock() - clk; + + //////////////////////////////////////////// + // prepare the solver to run incrementally on these variables +//clk = clock(); + Msat_SolverPrepare( p->pSat, p->vVarsInt ); +//p->time3 += clock() - clk; + + // solve under assumptions + // A = 1; B = 0 OR A = 1; B = 1 + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1R->Num, !Fraig_IsComplement(pNode1)) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2R->Num, !Fraig_IsComplement(pNode2)) ); + // run the solver +clk = clock(); + RetValue1 = Msat_SolverSolve( p->pSat, p->vProj, nBTLimit, 1000000 ); +p->timeSat += clock() - clk; + + if ( RetValue1 == MSAT_FALSE ) + { +//p->time1 += clock() - clk; + +if ( fVerbose ) +{ + printf( "unsat %d ", Msat_SolverReadBackTracks(p->pSat) ); +PRT( "time", clock() - clk ); +} + + // add the clause + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1R->Num, Fraig_IsComplement(pNode1)) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2R->Num, Fraig_IsComplement(pNode2)) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); +// p->nSatProofImp++; + return 1; + } + else if ( RetValue1 == MSAT_TRUE ) + { +//p->time2 += clock() - clk; + +if ( fVerbose ) +{ + printf( "sat %d ", Msat_SolverReadBackTracks(p->pSat) ); +PRT( "time", clock() - clk ); +} + // record the counter example +// Fraig_FeedBack( p, Msat_SolverReadModelArray(p->pSat), p->vVarsInt, pNode1R, pNode2R ); + p->nSatCounterImp++; + return 0; + } + else // if ( RetValue1 == MSAT_UNKNOWN ) + { +p->time3 += clock() - clk; + p->nSatFailsImp++; + return 0; + } +} + + +/**Function************************************************************* + + Synopsis [Prepares the SAT solver to run on the two nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_PrepareCones( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ +// Msat_IntVec_t * vAdjs; +// int * pVars, nVars, i, k; + int nVarsAlloc; + + assert( pOld != pNew ); + assert( !Fraig_IsComplement(pOld) ); + assert( !Fraig_IsComplement(pNew) ); + // clean the variables + nVarsAlloc = Msat_IntVecReadSize(pMan->vVarsUsed); + Msat_IntVecFill( pMan->vVarsUsed, nVarsAlloc, 0 ); + Msat_IntVecClear( pMan->vVarsInt ); + + pMan->nTravIds++; + Fraig_PrepareCones_rec( pMan, pNew ); + Fraig_PrepareCones_rec( pMan, pOld ); + + +/* + nVars = Msat_IntVecReadSize( pMan->vVarsInt ); + pVars = Msat_IntVecReadArray( pMan->vVarsInt ); + for ( i = 0; i < nVars; i++ ) + { + // process its connections + vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] ); + printf( "%d=%d { ", pVars[i], Msat_IntVecReadSize(vAdjs) ); + for ( k = 0; k < Msat_IntVecReadSize(vAdjs); k++ ) + printf( "%d ", Msat_IntVecReadEntry(vAdjs,k) ); + printf( "}\n" ); + + } + i = 0; +*/ +} + +/**Function************************************************************* + + Synopsis [Traverses the cone, collects the numbers and adds the clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_PrepareCones_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pFanin; + Msat_IntVec_t * vAdjs; + int fUseMuxes = 1, i; + int fItIsTime; + + // skip if the node is aleady visited + assert( !Fraig_IsComplement(pNode) ); + if ( pNode->TravId == pMan->nTravIds ) + return; + pNode->TravId = pMan->nTravIds; + + // collect the node's number (closer to reverse topological order) + Msat_IntVecPush( pMan->vVarsInt, pNode->Num ); + Msat_IntVecWriteEntry( pMan->vVarsUsed, pNode->Num, 1 ); + if ( !Fraig_NodeIsAnd( pNode ) ) + return; + + // if the node does not have fanins, create them + fItIsTime = 0; + if ( pNode->vFanins == NULL ) + { + fItIsTime = 1; + // create the fanins of the supergate + assert( pNode->fClauses == 0 ); + if ( fUseMuxes && Fraig_NodeIsMuxType(pNode) ) + { + pNode->vFanins = Fraig_NodeVecAlloc( 4 ); + Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p1) ); + Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p2) ); + Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p1) ); + Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p2) ); + Fraig_SupergateAddClausesMux( pMan, pNode ); + } + else + { + pNode->vFanins = Fraig_CollectSupergate( pNode, fUseMuxes ); + Fraig_SupergateAddClauses( pMan, pNode, pNode->vFanins ); + } + assert( pNode->vFanins->nSize > 1 ); + pNode->fClauses = 1; + pMan->nVarsClauses++; + + // add fanins + vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pNode->Num ); + assert( Msat_IntVecReadSize( vAdjs ) == 0 ); + for ( i = 0; i < pNode->vFanins->nSize; i++ ) + { + pFanin = Fraig_Regular(pNode->vFanins->pArray[i]); + Msat_IntVecPush( vAdjs, pFanin->Num ); + } + } + + // recursively visit the fanins + for ( i = 0; i < pNode->vFanins->nSize; i++ ) + Fraig_PrepareCones_rec( pMan, Fraig_Regular(pNode->vFanins->pArray[i]) ); + + if ( fItIsTime ) + { + // recursively visit the fanins + for ( i = 0; i < pNode->vFanins->nSize; i++ ) + { + pFanin = Fraig_Regular(pNode->vFanins->pArray[i]); + vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num ); + Msat_IntVecPush( vAdjs, pNode->Num ); + } + } +} + +/**Function************************************************************* + + Synopsis [Collect variables using their proximity from the nodes.] + + Description [This procedure creates a variable order based on collecting + first the nodes that are the closest to the given two target nodes.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_OrderVariables( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ + Fraig_Node_t * pNode, * pFanin; + int i, k, Number, fUseMuxes = 1; + int nVarsAlloc; + + assert( pOld != pNew ); + assert( !Fraig_IsComplement(pOld) ); + assert( !Fraig_IsComplement(pNew) ); + + pMan->nTravIds++; + + // clean the variables + nVarsAlloc = Msat_IntVecReadSize(pMan->vVarsUsed); + Msat_IntVecFill( pMan->vVarsUsed, nVarsAlloc, 0 ); + Msat_IntVecClear( pMan->vVarsInt ); + + // add the first node + Msat_IntVecPush( pMan->vVarsInt, pOld->Num ); + Msat_IntVecWriteEntry( pMan->vVarsUsed, pOld->Num, 1 ); + pOld->TravId = pMan->nTravIds; + + // add the second node + Msat_IntVecPush( pMan->vVarsInt, pNew->Num ); + Msat_IntVecWriteEntry( pMan->vVarsUsed, pNew->Num, 1 ); + pNew->TravId = pMan->nTravIds; + + // create the variable order + for ( i = 0; i < Msat_IntVecReadSize(pMan->vVarsInt); i++ ) + { + // get the new node on the frontier + Number = Msat_IntVecReadEntry(pMan->vVarsInt, i); + pNode = pMan->vNodes->pArray[Number]; + if ( !Fraig_NodeIsAnd(pNode) ) + continue; + + // if the node does not have fanins, create them + if ( pNode->vFanins == NULL ) + { + // create the fanins of the supergate + assert( pNode->fClauses == 0 ); + // detecting a fanout-free cone (experiment only) +// Fraig_DetectFanoutFreeCone( pMan, pNode ); + + if ( fUseMuxes && Fraig_NodeIsMuxType(pNode) ) + { + pNode->vFanins = Fraig_NodeVecAlloc( 4 ); + Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p1) ); + Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p1)->p2) ); + Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p1) ); + Fraig_NodeVecPushUnique( pNode->vFanins, Fraig_Regular(Fraig_Regular(pNode->p2)->p2) ); + Fraig_SupergateAddClausesMux( pMan, pNode ); +// Fraig_DetectFanoutFreeConeMux( pMan, pNode ); + + nMuxes++; + } + else + { + pNode->vFanins = Fraig_CollectSupergate( pNode, fUseMuxes ); + Fraig_SupergateAddClauses( pMan, pNode, pNode->vFanins ); + } + assert( pNode->vFanins->nSize > 1 ); + pNode->fClauses = 1; + pMan->nVarsClauses++; + + pNode->fMark2 = 1; // goes together with Fraig_SetupAdjacentMark() + } + + // explore the implication fanins of pNode + for ( k = 0; k < pNode->vFanins->nSize; k++ ) + { + pFanin = Fraig_Regular(pNode->vFanins->pArray[k]); + if ( pFanin->TravId == pMan->nTravIds ) // already collected + continue; + // collect and mark + Msat_IntVecPush( pMan->vVarsInt, pFanin->Num ); + Msat_IntVecWriteEntry( pMan->vVarsUsed, pFanin->Num, 1 ); + pFanin->TravId = pMan->nTravIds; + } + } + + // set up the adjacent variable information +// Fraig_SetupAdjacent( pMan, pMan->vVarsInt ); + Fraig_SetupAdjacentMark( pMan, pMan->vVarsInt ); +} + + + +/**Function************************************************************* + + Synopsis [Set up the adjacent variable information.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_SetupAdjacent( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars ) +{ + Fraig_Node_t * pNode, * pFanin; + Msat_IntVec_t * vAdjs; + int * pVars, nVars, i, k; + + // clean the adjacents for the variables + nVars = Msat_IntVecReadSize( vConeVars ); + pVars = Msat_IntVecReadArray( vConeVars ); + for ( i = 0; i < nVars; i++ ) + { + // process its connections + vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] ); + Msat_IntVecClear( vAdjs ); + + pNode = pMan->vNodes->pArray[pVars[i]]; + if ( !Fraig_NodeIsAnd(pNode) ) + continue; + + // add fanins + vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] ); + for ( k = 0; k < pNode->vFanins->nSize; k++ ) +// for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- ) + { + pFanin = Fraig_Regular(pNode->vFanins->pArray[k]); + Msat_IntVecPush( vAdjs, pFanin->Num ); +// Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num ); + } + } + // add the fanouts + for ( i = 0; i < nVars; i++ ) + { + pNode = pMan->vNodes->pArray[pVars[i]]; + if ( !Fraig_NodeIsAnd(pNode) ) + continue; + + // add the edges + for ( k = 0; k < pNode->vFanins->nSize; k++ ) +// for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- ) + { + pFanin = Fraig_Regular(pNode->vFanins->pArray[k]); + vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num ); + Msat_IntVecPush( vAdjs, pNode->Num ); +// Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num ); + } + } +} + + +/**Function************************************************************* + + Synopsis [Set up the adjacent variable information.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_SetupAdjacentMark( Fraig_Man_t * pMan, Msat_IntVec_t * vConeVars ) +{ + Fraig_Node_t * pNode, * pFanin; + Msat_IntVec_t * vAdjs; + int * pVars, nVars, i, k; + + // clean the adjacents for the variables + nVars = Msat_IntVecReadSize( vConeVars ); + pVars = Msat_IntVecReadArray( vConeVars ); + for ( i = 0; i < nVars; i++ ) + { + pNode = pMan->vNodes->pArray[pVars[i]]; + if ( pNode->fMark2 == 0 ) + continue; +// pNode->fMark2 = 0; + + // process its connections +// vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] ); +// Msat_IntVecClear( vAdjs ); + + if ( !Fraig_NodeIsAnd(pNode) ) + continue; + + // add fanins + vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pVars[i] ); + for ( k = 0; k < pNode->vFanins->nSize; k++ ) +// for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- ) + { + pFanin = Fraig_Regular(pNode->vFanins->pArray[k]); + Msat_IntVecPush( vAdjs, pFanin->Num ); +// Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num ); + } + } + // add the fanouts + for ( i = 0; i < nVars; i++ ) + { + pNode = pMan->vNodes->pArray[pVars[i]]; + if ( pNode->fMark2 == 0 ) + continue; + pNode->fMark2 = 0; + + if ( !Fraig_NodeIsAnd(pNode) ) + continue; + + // add the edges + for ( k = 0; k < pNode->vFanins->nSize; k++ ) +// for ( k = pNode->vFanins->nSize - 1; k >= 0; k-- ) + { + pFanin = Fraig_Regular(pNode->vFanins->pArray[k]); + vAdjs = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( pMan->vAdjacents, pFanin->Num ); + Msat_IntVecPush( vAdjs, pNode->Num ); +// Msat_IntVecPushUniqueOrder( vAdjs, pFanin->Num ); + } + } +} + + + + +/**Function************************************************************* + + Synopsis [Adds clauses to the solver.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_SupergateAddClauses( Fraig_Man_t * p, Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper ) +{ + int fComp1, RetValue, nVars, Var, Var1, i; + + assert( Fraig_NodeIsAnd( pNode ) ); + nVars = Msat_SolverReadVarNum(p->pSat); + + Var = pNode->Num; + assert( Var < nVars ); + for ( i = 0; i < vSuper->nSize; i++ ) + { + // get the predecessor nodes + // get the complemented attributes of the nodes + fComp1 = Fraig_IsComplement(vSuper->pArray[i]); + // determine the variable numbers + Var1 = Fraig_Regular(vSuper->pArray[i])->Num; + // check that the variables are in the SAT manager + assert( Var1 < nVars ); + + // suppose the AND-gate is A * B = C + // add !A => !C or A + !C + // fprintf( pFile, "%d %d 0%c", Var1, -Var, 10 ); + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var1, fComp1) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var, 1) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + } + + // add A & B => C or !A + !B + C +// fprintf( pFile, "%d %d %d 0%c", -Var1, -Var2, Var, 10 ); + Msat_IntVecClear( p->vProj ); + for ( i = 0; i < vSuper->nSize; i++ ) + { + // get the predecessor nodes + // get the complemented attributes of the nodes + fComp1 = Fraig_IsComplement(vSuper->pArray[i]); + // determine the variable numbers + Var1 = Fraig_Regular(vSuper->pArray[i])->Num; + + // add this variable to the array + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var1, !fComp1) ); + } + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(Var, 0) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); +} + +/**Function************************************************************* + + Synopsis [Adds clauses to the solver.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_SupergateAddClausesExor( Fraig_Man_t * p, Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pNode1, * pNode2; + int fComp, RetValue; + + assert( !Fraig_IsComplement( pNode ) ); + assert( Fraig_NodeIsExorType( pNode ) ); + // get nodes + pNode1 = Fraig_Regular(Fraig_Regular(pNode->p1)->p1); + pNode2 = Fraig_Regular(Fraig_Regular(pNode->p1)->p2); + // get the complemented attribute of the EXOR/NEXOR gate + fComp = Fraig_NodeIsExor( pNode ); // 1 if EXOR, 0 if NEXOR + + // create four clauses + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, fComp) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, fComp) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, fComp) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, fComp) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, !fComp) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, !fComp) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, !fComp) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, fComp) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, !fComp) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode->Num, !fComp) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode1->Num, !fComp) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(pNode2->Num, fComp) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); +} + +/**Function************************************************************* + + Synopsis [Adds clauses to the solver.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_SupergateAddClausesMux( Fraig_Man_t * p, Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pNodeI, * pNodeT, * pNodeE; + int RetValue, VarF, VarI, VarT, VarE, fCompT, fCompE; + + assert( !Fraig_IsComplement( pNode ) ); + assert( Fraig_NodeIsMuxType( pNode ) ); + // get nodes (I = if, T = then, E = else) + pNodeI = Fraig_NodeRecognizeMux( pNode, &pNodeT, &pNodeE ); + // get the variable numbers + VarF = pNode->Num; + VarI = pNodeI->Num; + VarT = Fraig_Regular(pNodeT)->Num; + VarE = Fraig_Regular(pNodeE)->Num; + // get the complementation flags + fCompT = Fraig_IsComplement(pNodeT); + fCompE = Fraig_IsComplement(pNodeE); + + // f = ITE(i, t, e) + + // i' + t' + f + // i' + t + f' + // i + e' + f + // i + e + f' + + // create four clauses + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI, 1) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT, 1^fCompT) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 0) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI, 1) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT, 0^fCompT) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 1) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI, 0) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE, 1^fCompE) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 0) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarI, 0) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE, 0^fCompE) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 1) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + + // two additional clauses + // t' & e' -> f' + // t & e -> f + + // t + e + f' + // t' + e' + f + + if ( VarT == VarE ) + { +// assert( fCompT == !fCompE ); + return; + } + + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT, 0^fCompT) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE, 0^fCompE) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 1) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + Msat_IntVecClear( p->vProj ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarT, 1^fCompT) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarE, 1^fCompE) ); + Msat_IntVecPush( p->vProj, MSAT_VAR2LIT(VarF, 0) ); + RetValue = Msat_SolverAddClause( p->pSat, p->vProj ); + assert( RetValue ); + +} + + + + + +/**Function************************************************************* + + Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_DetectFanoutFreeCone_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, Fraig_NodeVec_t * vInside, int fFirst ) +{ + // make the pointer regular + pNode = Fraig_Regular(pNode); + // if the new node is complemented or a PI, another gate begins + if ( (!fFirst && pNode->nRefs > 1) || Fraig_NodeIsVar(pNode) ) + { + Fraig_NodeVecPushUnique( vSuper, pNode ); + return; + } + // go through the branches + Fraig_DetectFanoutFreeCone_rec( pNode->p1, vSuper, vInside, 0 ); + Fraig_DetectFanoutFreeCone_rec( pNode->p2, vSuper, vInside, 0 ); + // add the node + Fraig_NodeVecPushUnique( vInside, pNode ); +} + +/**Function************************************************************* + + Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +/* +void Fraig_DetectFanoutFreeCone( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + Fraig_NodeVec_t * vFanins; + Fraig_NodeVec_t * vInside; + int nCubes; + extern int Fraig_CutSopCountCubes( Fraig_Man_t * pMan, Fraig_NodeVec_t * vFanins, Fraig_NodeVec_t * vInside ); + + vFanins = Fraig_NodeVecAlloc( 8 ); + vInside = Fraig_NodeVecAlloc( 8 ); + + Fraig_DetectFanoutFreeCone_rec( pNode, vFanins, vInside, 1 ); + assert( vInside->pArray[vInside->nSize-1] == pNode ); + + nCubes = Fraig_CutSopCountCubes( pMan, vFanins, vInside ); + +printf( "%d(%d)", vFanins->nSize, nCubes ); + Fraig_NodeVecFree( vFanins ); + Fraig_NodeVecFree( vInside ); +} +*/ + + + +/**Function************************************************************* + + Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_DetectFanoutFreeConeMux_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, Fraig_NodeVec_t * vInside, int fFirst ) +{ + // make the pointer regular + pNode = Fraig_Regular(pNode); + // if the new node is complemented or a PI, another gate begins + if ( (!fFirst && pNode->nRefs > 1) || Fraig_NodeIsVar(pNode) || !Fraig_NodeIsMuxType(pNode) ) + { + Fraig_NodeVecPushUnique( vSuper, pNode ); + return; + } + // go through the branches + Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p1)->p1, vSuper, vInside, 0 ); + Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p1)->p2, vSuper, vInside, 0 ); + Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p2)->p1, vSuper, vInside, 0 ); + Fraig_DetectFanoutFreeConeMux_rec( Fraig_Regular(pNode->p2)->p2, vSuper, vInside, 0 ); + // add the node + Fraig_NodeVecPushUnique( vInside, pNode ); +} + +/**Function************************************************************* + + Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_DetectFanoutFreeConeMux( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + Fraig_NodeVec_t * vFanins; + Fraig_NodeVec_t * vInside; + int nCubes; + extern int Fraig_CutSopCountCubes( Fraig_Man_t * pMan, Fraig_NodeVec_t * vFanins, Fraig_NodeVec_t * vInside ); + + vFanins = Fraig_NodeVecAlloc( 8 ); + vInside = Fraig_NodeVecAlloc( 8 ); + + Fraig_DetectFanoutFreeConeMux_rec( pNode, vFanins, vInside, 1 ); + assert( vInside->pArray[vInside->nSize-1] == pNode ); + +// nCubes = Fraig_CutSopCountCubes( pMan, vFanins, vInside ); + nCubes = 0; + +printf( "%d(%d)", vFanins->nSize, nCubes ); + Fraig_NodeVecFree( vFanins ); + Fraig_NodeVecFree( vInside ); +} + + + +/**Function************************************************************* + + Synopsis [Collect variables using their proximity from the nodes.] + + Description [This procedure creates a variable order based on collecting + first the nodes that are the closest to the given two target nodes.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_SetActivity( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ + Fraig_Node_t * pNode; + int i, Number, MaxLevel; + float * pFactors = Msat_SolverReadFactors(pMan->pSat); + if ( pFactors == NULL ) + return; + MaxLevel = FRAIG_MAX( pOld->Level, pNew->Level ); + // create the variable order + for ( i = 0; i < Msat_IntVecReadSize(pMan->vVarsInt); i++ ) + { + // get the new node on the frontier + Number = Msat_IntVecReadEntry(pMan->vVarsInt, i); + pNode = pMan->vNodes->pArray[Number]; + pFactors[pNode->Num] = (float)pow( 0.97, MaxLevel - pNode->Level ); +// if ( pNode->Num % 50 == 0 ) +// printf( "(%d) %.2f ", MaxLevel - pNode->Level, pFactors[pNode->Num] ); + } +// printf( "\n" ); +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigTable.c b/src/sat/fraig/fraigTable.c new file mode 100644 index 00000000..b68bbe0e --- /dev/null +++ b/src/sat/fraig/fraigTable.c @@ -0,0 +1,657 @@ +/**CFile**************************************************************** + + FileName [fraigTable.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Structural and functional hash tables.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigTable.c,v 1.7 2005/07/08 01:01:34 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static void Fraig_TableResizeS( Fraig_HashTable_t * p ); +static void Fraig_TableResizeF( Fraig_HashTable_t * p, int fUseSimR ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates the hash table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_HashTable_t * Fraig_HashTableCreate( int nSize ) +{ + Fraig_HashTable_t * p; + // allocate the table + p = ALLOC( Fraig_HashTable_t, 1 ); + memset( p, 0, sizeof(Fraig_HashTable_t) ); + // allocate and clean the bins + p->nBins = Cudd_PrimeFraig(nSize); + p->pBins = ALLOC( Fraig_Node_t *, p->nBins ); + memset( p->pBins, 0, sizeof(Fraig_Node_t *) * p->nBins ); + return p; +} + +/**Function************************************************************* + + Synopsis [Deallocates the supergate hash table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_HashTableFree( Fraig_HashTable_t * p ) +{ + FREE( p->pBins ); + FREE( p ); +} + +/**Function************************************************************* + + Synopsis [Looks up an entry in the structural hash table.] + + Description [If the entry with the same children does not exists, + creates it, inserts it into the table, and returns 0. If the entry + with the same children exists, finds it, and return 1. In both cases, + the new/old entry is returned in ppNodeRes.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_HashTableLookupS( Fraig_Man_t * pMan, Fraig_Node_t * p1, Fraig_Node_t * p2, Fraig_Node_t ** ppNodeRes ) +{ + Fraig_HashTable_t * p = pMan->pTableS; + Fraig_Node_t * pEnt; + unsigned Key; + + // order the arguments + if ( Fraig_Regular(p1)->Num > Fraig_Regular(p2)->Num ) + pEnt = p1, p1 = p2, p2 = pEnt; + + Key = Fraig_HashKey2( p1, p2, p->nBins ); + Fraig_TableBinForEachEntryS( p->pBins[Key], pEnt ) + if ( pEnt->p1 == p1 && pEnt->p2 == p2 ) + { + *ppNodeRes = pEnt; + return 1; + } + // check if it is a good time for table resizing + if ( p->nEntries >= 2 * p->nBins ) + { + Fraig_TableResizeS( p ); + Key = Fraig_HashKey2( p1, p2, p->nBins ); + } + // create the new node + pEnt = Fraig_NodeCreate( pMan, p1, p2 ); + // add the node to the corresponding linked list in the table + pEnt->pNextS = p->pBins[Key]; + p->pBins[Key] = pEnt; + *ppNodeRes = pEnt; + p->nEntries++; + return 0; +} + + +/**Function************************************************************* + + Synopsis [Insert the entry in the functional hash table.] + + Description [If the entry with the same key exists, return it right away. + If the entry with the same key does not exists, inserts it and returns NULL. ] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_HashTableLookupF( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + Fraig_HashTable_t * p = pMan->pTableF; + Fraig_Node_t * pEnt, * pEntD; + unsigned Key; + + // go through the hash table entries + Key = pNode->uHashR % p->nBins; + Fraig_TableBinForEachEntryF( p->pBins[Key], pEnt ) + { + // if their simulation info differs, skip + if ( !Fraig_CompareSimInfo( pNode, pEnt, pMan->nWordsRand, 1 ) ) + continue; + // equivalent up to the complement + Fraig_TableBinForEachEntryD( pEnt, pEntD ) + { + // if their simulation info differs, skip + if ( !Fraig_CompareSimInfo( pNode, pEntD, pMan->iWordStart, 0 ) ) + continue; + // found a simulation-equivalent node + return pEntD; + } + // did not find a simulation equivalent node + // add the node to the corresponding linked list + pNode->pNextD = pEnt->pNextD; + pEnt->pNextD = pNode; + // return NULL, because there is no functional equivalence in this case + return NULL; + } + + // check if it is a good time for table resizing + if ( p->nEntries >= 2 * p->nBins ) + { + Fraig_TableResizeF( p, 1 ); + Key = pNode->uHashR % p->nBins; + } + + // add the node to the corresponding linked list in the table + pNode->pNextF = p->pBins[Key]; + p->pBins[Key] = pNode; + p->nEntries++; + // return NULL, because there is no functional equivalence in this case + return NULL; +} + +/**Function************************************************************* + + Synopsis [Insert the entry in the functional hash table.] + + Description [If the entry with the same key exists, return it right away. + If the entry with the same key does not exists, inserts it and returns NULL. ] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_HashTableLookupF0( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + Fraig_HashTable_t * p = pMan->pTableF0; + Fraig_Node_t * pEnt; + unsigned Key; + + // go through the hash table entries + Key = pNode->uHashD % p->nBins; + Fraig_TableBinForEachEntryF( p->pBins[Key], pEnt ) + { + // if their simulation info differs, skip + if ( !Fraig_CompareSimInfo( pNode, pEnt, pMan->iWordStart, 0 ) ) + continue; + // found a simulation-equivalent node + return pEnt; + } + + // check if it is a good time for table resizing + if ( p->nEntries >= 2 * p->nBins ) + { + Fraig_TableResizeF( p, 0 ); + Key = pNode->uHashD % p->nBins; + } + + // add the node to the corresponding linked list in the table + pNode->pNextF = p->pBins[Key]; + p->pBins[Key] = pNode; + p->nEntries++; + // return NULL, because there is no functional equivalence in this case + return NULL; +} + +/**Function************************************************************* + + Synopsis [Insert the entry in the functional hash table.] + + Description [Unconditionally add the node to the corresponding + linked list in the table.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_HashTableInsertF0( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + Fraig_HashTable_t * p = pMan->pTableF0; + unsigned Key = pNode->uHashD % p->nBins; + + pNode->pNextF = p->pBins[Key]; + p->pBins[Key] = pNode; + p->nEntries++; +} + + +/**Function************************************************************* + + Synopsis [Resizes the table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_TableResizeS( Fraig_HashTable_t * p ) +{ + Fraig_Node_t ** pBinsNew; + Fraig_Node_t * pEnt, * pEnt2; + int nBinsNew, Counter, i, clk; + unsigned Key; + +clk = clock(); + // get the new table size + nBinsNew = Cudd_PrimeFraig(2 * p->nBins); + // allocate a new array + pBinsNew = ALLOC( Fraig_Node_t *, nBinsNew ); + memset( pBinsNew, 0, sizeof(Fraig_Node_t *) * nBinsNew ); + // rehash the entries from the old table + Counter = 0; + for ( i = 0; i < p->nBins; i++ ) + Fraig_TableBinForEachEntrySafeS( p->pBins[i], pEnt, pEnt2 ) + { + Key = Fraig_HashKey2( pEnt->p1, pEnt->p2, nBinsNew ); + pEnt->pNextS = pBinsNew[Key]; + pBinsNew[Key] = pEnt; + Counter++; + } + assert( Counter == p->nEntries ); +// printf( "Increasing the structural table size from %6d to %6d. ", p->nBins, nBinsNew ); +// PRT( "Time", clock() - clk ); + // replace the table and the parameters + free( p->pBins ); + p->pBins = pBinsNew; + p->nBins = nBinsNew; +} + +/**Function************************************************************* + + Synopsis [Resizes the table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_TableResizeF( Fraig_HashTable_t * p, int fUseSimR ) +{ + Fraig_Node_t ** pBinsNew; + Fraig_Node_t * pEnt, * pEnt2; + int nBinsNew, Counter, i, clk; + unsigned Key; + +clk = clock(); + // get the new table size + nBinsNew = Cudd_PrimeFraig(2 * p->nBins); + // allocate a new array + pBinsNew = ALLOC( Fraig_Node_t *, nBinsNew ); + memset( pBinsNew, 0, sizeof(Fraig_Node_t *) * nBinsNew ); + // rehash the entries from the old table + Counter = 0; + for ( i = 0; i < p->nBins; i++ ) + Fraig_TableBinForEachEntrySafeF( p->pBins[i], pEnt, pEnt2 ) + { + if ( fUseSimR ) + Key = pEnt->uHashR % nBinsNew; + else + Key = pEnt->uHashD % nBinsNew; + pEnt->pNextF = pBinsNew[Key]; + pBinsNew[Key] = pEnt; + Counter++; + } + assert( Counter == p->nEntries ); +// printf( "Increasing the functional table size from %6d to %6d. ", p->nBins, nBinsNew ); +// PRT( "Time", clock() - clk ); + // replace the table and the parameters + free( p->pBins ); + p->pBins = pBinsNew; + p->nBins = nBinsNew; +} + + +/**Function************************************************************* + + Synopsis [Compares two pieces of simulation info.] + + Description [Returns 1 if they are equal.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_CompareSimInfo( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand ) +{ + int i; + assert( !Fraig_IsComplement(pNode1) ); + assert( !Fraig_IsComplement(pNode2) ); + if ( fUseRand ) + { + // if their signatures differ, skip + if ( pNode1->uHashR != pNode2->uHashR ) + return 0; + // check the simulation info + for ( i = 0; i < iWordLast; i++ ) + if ( pNode1->puSimR[i] != pNode2->puSimR[i] ) + return 0; + } + else + { + // if their signatures differ, skip + if ( pNode1->uHashD != pNode2->uHashD ) + return 0; + // check the simulation info + for ( i = 0; i < iWordLast; i++ ) + if ( pNode1->puSimD[i] != pNode2->puSimD[i] ) + return 0; + } + return 1; +} + +/**Function************************************************************* + + Synopsis [Find the number of the different pattern.] + + Description [Returns -1 if there is no such pattern] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_FindFirstDiff( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int fCompl, int iWordLast, int fUseRand ) +{ + int i, v; + assert( !Fraig_IsComplement(pNode1) ); + assert( !Fraig_IsComplement(pNode2) ); + // take into account possible internal complementation + fCompl ^= pNode1->fInv; + fCompl ^= pNode2->fInv; + // find the pattern + if ( fCompl ) + { + if ( fUseRand ) + { + for ( i = 0; i < iWordLast; i++ ) + if ( pNode1->puSimR[i] != ~pNode2->puSimR[i] ) + for ( v = 0; v < 32; v++ ) + if ( (pNode1->puSimR[i] ^ ~pNode2->puSimR[i]) & (1 << v) ) + return i * 32 + v; + } + else + { + for ( i = 0; i < iWordLast; i++ ) + if ( pNode1->puSimD[i] != ~pNode2->puSimD[i] ) + for ( v = 0; v < 32; v++ ) + if ( (pNode1->puSimD[i] ^ ~pNode2->puSimD[i]) & (1 << v) ) + return i * 32 + v; + } + } + else + { + if ( fUseRand ) + { + for ( i = 0; i < iWordLast; i++ ) + if ( pNode1->puSimR[i] != pNode2->puSimR[i] ) + for ( v = 0; v < 32; v++ ) + if ( (pNode1->puSimR[i] ^ pNode2->puSimR[i]) & (1 << v) ) + return i * 32 + v; + } + else + { + for ( i = 0; i < iWordLast; i++ ) + if ( pNode1->puSimD[i] != pNode2->puSimD[i] ) + for ( v = 0; v < 32; v++ ) + if ( (pNode1->puSimD[i] ^ pNode2->puSimD[i]) & (1 << v) ) + return i * 32 + v; + } + } + return -1; +} + +/**Function************************************************************* + + Synopsis [Compares two pieces of simulation info.] + + Description [Returns 1 if they are equal.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_CompareSimInfoUnderMask( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand, unsigned * puMask ) +{ + unsigned * pSims1, * pSims2; + int i; + assert( !Fraig_IsComplement(pNode1) ); + assert( !Fraig_IsComplement(pNode2) ); + // get hold of simulation info + pSims1 = fUseRand? pNode1->puSimR : pNode1->puSimD; + pSims2 = fUseRand? pNode2->puSimR : pNode2->puSimD; + // check the simulation info + for ( i = 0; i < iWordLast; i++ ) + if ( (pSims1[i] & puMask[i]) != (pSims2[i] & puMask[i]) ) + return 0; + return 1; +} + +/**Function************************************************************* + + Synopsis [Compares two pieces of simulation info.] + + Description [Returns 1 if they are equal.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_CollectXors( Fraig_Node_t * pNode1, Fraig_Node_t * pNode2, int iWordLast, int fUseRand, unsigned * puMask ) +{ + unsigned * pSims1, * pSims2; + int i; + assert( !Fraig_IsComplement(pNode1) ); + assert( !Fraig_IsComplement(pNode2) ); + // get hold of simulation info + pSims1 = fUseRand? pNode1->puSimR : pNode1->puSimD; + pSims2 = fUseRand? pNode2->puSimR : pNode2->puSimD; + // check the simulation info + for ( i = 0; i < iWordLast; i++ ) + puMask[i] = ( pSims1[i] ^ pSims2[i] ); +} + + +/**Function************************************************************* + + Synopsis [Prints stats of the structural table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_TablePrintStatsS( Fraig_Man_t * pMan ) +{ + Fraig_HashTable_t * pT = pMan->pTableS; + Fraig_Node_t * pNode; + int i, Counter; + + printf( "Structural table. Table size = %d. Number of entries = %d.\n", pT->nBins, pT->nEntries ); + for ( i = 0; i < pT->nBins; i++ ) + { + Counter = 0; + Fraig_TableBinForEachEntryS( pT->pBins[i], pNode ) + Counter++; + if ( Counter > 1 ) + { + printf( "%d ", Counter ); + if ( Counter > 50 ) + printf( "{%d} ", i ); + } + } + printf( "\n" ); +} + +/**Function************************************************************* + + Synopsis [Prints stats of the structural table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_TablePrintStatsF( Fraig_Man_t * pMan ) +{ + Fraig_HashTable_t * pT = pMan->pTableF; + Fraig_Node_t * pNode; + int i, Counter; + + printf( "Functional table. Table size = %d. Number of entries = %d.\n", pT->nBins, pT->nEntries ); + for ( i = 0; i < pT->nBins; i++ ) + { + Counter = 0; + Fraig_TableBinForEachEntryF( pT->pBins[i], pNode ) + Counter++; + if ( Counter > 1 ) + printf( "{%d} ", Counter ); + } + printf( "\n" ); +} + +/**Function************************************************************* + + Synopsis [Prints stats of the structural table.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_TablePrintStatsF0( Fraig_Man_t * pMan ) +{ + Fraig_HashTable_t * pT = pMan->pTableF0; + Fraig_Node_t * pNode; + int i, Counter; + + printf( "Zero-node table. Table size = %d. Number of entries = %d.\n", pT->nBins, pT->nEntries ); + for ( i = 0; i < pT->nBins; i++ ) + { + Counter = 0; + Fraig_TableBinForEachEntryF( pT->pBins[i], pNode ) + Counter++; + if ( Counter == 0 ) + continue; +/* + printf( "\nBin = %4d : Number of entries = %4d\n", i, Counter ); + Fraig_TableBinForEachEntryF( pT->pBins[i], pNode ) + printf( "Node %5d. Hash = %10d.\n", pNode->Num, pNode->uHashD ); +*/ + } + printf( "\n" ); +} + +/**Function************************************************************* + + Synopsis [Rehashes the table after the simulation info has changed.] + + Description [Assumes that the hash values have been updated after performing + additional simulation. Rehashes the table using the new hash values. + Uses pNextF to link the entries in the bins. Uses pNextD to link the entries + with identical hash values. Returns 1 if the identical entries have been found. + Note that identical hash values may mean that the simulation data is different.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_TableRehashF0( Fraig_Man_t * pMan, int fLinkEquiv ) +{ + Fraig_HashTable_t * pT = pMan->pTableF0; + Fraig_Node_t ** pBinsNew; + Fraig_Node_t * pEntF, * pEntF2, * pEnt, * pEntD2, * pEntN; + int ReturnValue, Counter, i; + unsigned Key; + + // allocate a new array of bins + pBinsNew = ALLOC( Fraig_Node_t *, pT->nBins ); + memset( pBinsNew, 0, sizeof(Fraig_Node_t *) * pT->nBins ); + + // rehash the entries in the table + // go through all the nodes in the F-lists (and possible in D-lists, if used) + Counter = 0; + ReturnValue = 0; + for ( i = 0; i < pT->nBins; i++ ) + Fraig_TableBinForEachEntrySafeF( pT->pBins[i], pEntF, pEntF2 ) + Fraig_TableBinForEachEntrySafeD( pEntF, pEnt, pEntD2 ) + { + // decide where to put entry pEnt + Key = pEnt->uHashD % pT->nBins; + if ( fLinkEquiv ) + { + // go through the entries in the new bin + Fraig_TableBinForEachEntryF( pBinsNew[Key], pEntN ) + { + // if they have different values skip + if ( pEnt->uHashD != pEntN->uHashD ) + continue; + // they have the same hash value, add pEnt to the D-list pEnt3 + pEnt->pNextD = pEntN->pNextD; + pEntN->pNextD = pEnt; + ReturnValue = 1; + Counter++; + break; + } + if ( pEntN != NULL ) // already linked + continue; + // we did not find equal entry + } + // link the new entry + pEnt->pNextF = pBinsNew[Key]; + pBinsNew[Key] = pEnt; + pEnt->pNextD = NULL; + Counter++; + } + assert( Counter == pT->nEntries ); + // replace the table and the parameters + free( pT->pBins ); + pT->pBins = pBinsNew; + return ReturnValue; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigUtil.c b/src/sat/fraig/fraigUtil.c new file mode 100644 index 00000000..342a7111 --- /dev/null +++ b/src/sat/fraig/fraigUtil.c @@ -0,0 +1,1034 @@ +/**CFile**************************************************************** + + FileName [fraigUtil.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Various utilities.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigUtil.c,v 1.15 2005/07/08 01:01:34 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" +#include <limits.h> + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static int bit_count[256] = { + 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, + 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, + 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, + 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, + 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, + 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, + 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, + 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8 +}; + +static void Fraig_Dfs_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vNodes, int fEquiv ); +static int Fraig_CheckTfi_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_Node_t * pOld ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Computes the DFS ordering of the nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_Dfs( Fraig_Man_t * pMan, int fEquiv ) +{ + Fraig_NodeVec_t * vNodes; + int i; + pMan->nTravIds++; + vNodes = Fraig_NodeVecAlloc( 100 ); + for ( i = 0; i < pMan->vOutputs->nSize; i++ ) + Fraig_Dfs_rec( pMan, Fraig_Regular(pMan->vOutputs->pArray[i]), vNodes, fEquiv ); + return vNodes; +} + +/**Function************************************************************* + + Synopsis [Computes the DFS ordering of the nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_DfsOne( Fraig_Man_t * pMan, Fraig_Node_t * pNode, int fEquiv ) +{ + Fraig_NodeVec_t * vNodes; + pMan->nTravIds++; + vNodes = Fraig_NodeVecAlloc( 100 ); + Fraig_Dfs_rec( pMan, Fraig_Regular(pNode), vNodes, fEquiv ); + return vNodes; +} + +/**Function************************************************************* + + Synopsis [Computes the DFS ordering of the nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_DfsNodes( Fraig_Man_t * pMan, Fraig_Node_t ** ppNodes, int nNodes, int fEquiv ) +{ + Fraig_NodeVec_t * vNodes; + int i; + pMan->nTravIds++; + vNodes = Fraig_NodeVecAlloc( 100 ); + for ( i = 0; i < nNodes; i++ ) + Fraig_Dfs_rec( pMan, Fraig_Regular(ppNodes[i]), vNodes, fEquiv ); + return vNodes; +} + +/**Function************************************************************* + + Synopsis [Recursively computes the DFS ordering of the nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_Dfs_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_NodeVec_t * vNodes, int fEquiv ) +{ + assert( !Fraig_IsComplement(pNode) ); + // skip the visited node + if ( pNode->TravId == pMan->nTravIds ) + return; + pNode->TravId = pMan->nTravIds; + // visit the transitive fanin + if ( Fraig_NodeIsAnd(pNode) ) + { + Fraig_Dfs_rec( pMan, Fraig_Regular(pNode->p1), vNodes, fEquiv ); + Fraig_Dfs_rec( pMan, Fraig_Regular(pNode->p2), vNodes, fEquiv ); + } + if ( fEquiv && pNode->pNextE ) + Fraig_Dfs_rec( pMan, pNode->pNextE, vNodes, fEquiv ); + // save the node + Fraig_NodeVecPush( vNodes, pNode ); +} + +/**Function************************************************************* + + Synopsis [Computes the DFS ordering of the nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_CountNodes( Fraig_Man_t * pMan, int fEquiv ) +{ + Fraig_NodeVec_t * vNodes; + int RetValue; + vNodes = Fraig_Dfs( pMan, fEquiv ); + RetValue = vNodes->nSize; + Fraig_NodeVecFree( vNodes ); + return RetValue; +} + +/**Function************************************************************* + + Synopsis [Returns 1 if pOld is in the TFI of pNew.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_CheckTfi( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ + assert( !Fraig_IsComplement(pOld) ); + assert( !Fraig_IsComplement(pNew) ); + pMan->nTravIds++; + return Fraig_CheckTfi_rec( pMan, pNew, pOld ); +} + +/**Function************************************************************* + + Synopsis [Returns 1 if pOld is in the TFI of pNew.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_CheckTfi_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, Fraig_Node_t * pOld ) +{ + // check the trivial cases + if ( pNode == NULL ) + return 0; + if ( pNode->Num < pOld->Num && !pMan->fChoicing ) + return 0; + if ( pNode == pOld ) + return 1; + // skip the visited node + if ( pNode->TravId == pMan->nTravIds ) + return 0; + pNode->TravId = pMan->nTravIds; + // check the children + if ( Fraig_CheckTfi_rec( pMan, Fraig_Regular(pNode->p1), pOld ) ) + return 1; + if ( Fraig_CheckTfi_rec( pMan, Fraig_Regular(pNode->p2), pOld ) ) + return 1; + // check equivalent nodes + return Fraig_CheckTfi_rec( pMan, pNode->pNextE, pOld ); +} + + +/**Function************************************************************* + + Synopsis [Returns 1 if pOld is in the TFI of pNew.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_CheckTfi2( Fraig_Man_t * pMan, Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ + Fraig_NodeVec_t * vNodes; + int RetValue; + vNodes = Fraig_DfsOne( pMan, pNew, 1 ); + RetValue = (pOld->TravId == pMan->nTravIds); + Fraig_NodeVecFree( vNodes ); + return RetValue; +} + +/**Function************************************************************* + + Synopsis [Sets the number of fanouts (none, one, or many).] + + Description [This procedure collects the nodes reachable from + the POs of the AIG and sets the type of fanout counter (none, one, + or many) for each node. This procedure is useful to determine + fanout-free cones of AND-nodes, which is helpful for rebalancing + the AIG (see procedure Fraig_ManRebalance, or something like that).] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManMarkRealFanouts( Fraig_Man_t * p ) +{ + Fraig_NodeVec_t * vNodes; + Fraig_Node_t * pNodeR; + int i; + // collect the nodes reachable + vNodes = Fraig_Dfs( p, 0 ); + // clean the fanouts field + for ( i = 0; i < vNodes->nSize; i++ ) + { + vNodes->pArray[i]->nFanouts = 0; + vNodes->pArray[i]->pData0 = NULL; + } + // mark reachable nodes by setting the two-bit counter pNode->nFans + for ( i = 0; i < vNodes->nSize; i++ ) + { + pNodeR = Fraig_Regular(vNodes->pArray[i]->p1); + if ( pNodeR && ++pNodeR->nFanouts == 3 ) + pNodeR->nFanouts = 2; + pNodeR = Fraig_Regular(vNodes->pArray[i]->p2); + if ( pNodeR && ++pNodeR->nFanouts == 3 ) + pNodeR->nFanouts = 2; + } + Fraig_NodeVecFree( vNodes ); +} + +/**Function************************************************************* + + Synopsis [Creates the constant 1 node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_BitStringCountOnes( unsigned * pString, int nWords ) +{ + unsigned char * pSuppBytes = (unsigned char *)pString; + int i, nOnes, nBytes = sizeof(unsigned) * nWords; + // count the number of ones in the simulation vector + for ( i = nOnes = 0; i < nBytes; i++ ) + nOnes += bit_count[pSuppBytes[i]]; + return nOnes; +} + +/**Function************************************************************* + + Synopsis [Verify one useful property.] + + Description [This procedure verifies one useful property. After + the FRAIG construction with choice nodes is over, each primary node + should have fanins that are primary nodes. The primary nodes is the + one that does not have pNode->pRepr set to point to another node.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManCheckConsistency( Fraig_Man_t * p ) +{ + Fraig_Node_t * pNode; + Fraig_NodeVec_t * pVec; + int i; + pVec = Fraig_Dfs( p, 0 ); + for ( i = 0; i < pVec->nSize; i++ ) + { + pNode = pVec->pArray[i]; + if ( Fraig_NodeIsVar(pNode) ) + { + if ( pNode->pRepr ) + printf( "Primary input %d is a secondary node.\n", pNode->Num ); + } + else if ( Fraig_NodeIsConst(pNode) ) + { + if ( pNode->pRepr ) + printf( "Constant 1 %d is a secondary node.\n", pNode->Num ); + } + else + { + if ( pNode->pRepr ) + printf( "Internal node %d is a secondary node.\n", pNode->Num ); + if ( Fraig_Regular(pNode->p1)->pRepr ) + printf( "Internal node %d has first fanin %d that is a secondary node.\n", + pNode->Num, Fraig_Regular(pNode->p1)->Num ); + if ( Fraig_Regular(pNode->p2)->pRepr ) + printf( "Internal node %d has second fanin %d that is a secondary node.\n", + pNode->Num, Fraig_Regular(pNode->p2)->Num ); + } + } + Fraig_NodeVecFree( pVec ); + return 1; +} + +/**Function************************************************************* + + Synopsis [Prints the node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_PrintNode( Fraig_Man_t * p, Fraig_Node_t * pNode ) +{ + Fraig_NodeVec_t * vNodes; + Fraig_Node_t * pTemp; + int fCompl1, fCompl2, i; + + vNodes = Fraig_DfsOne( p, pNode, 0 ); + for ( i = 0; i < vNodes->nSize; i++ ) + { + pTemp = vNodes->pArray[i]; + if ( Fraig_NodeIsVar(pTemp) ) + { + printf( "%3d : PI ", pTemp->Num ); + Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimR, 20 ); + printf( " " ); + Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimD, 20 ); + printf( " %d\n", pTemp->fInv ); + continue; + } + + fCompl1 = Fraig_IsComplement(pTemp->p1); + fCompl2 = Fraig_IsComplement(pTemp->p2); + printf( "%3d : %c%3d %c%3d ", pTemp->Num, + (fCompl1? '-':'+'), Fraig_Regular(pTemp->p1)->Num, + (fCompl2? '-':'+'), Fraig_Regular(pTemp->p2)->Num ); + Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimR, 20 ); + printf( " " ); + Fraig_PrintBinary( stdout, (unsigned *)&pTemp->puSimD, 20 ); + printf( " %d\n", pTemp->fInv ); + } + Fraig_NodeVecFree( vNodes ); +} + +/**Function************************************************************* + + Synopsis [Prints the bit string.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_PrintBinary( FILE * pFile, unsigned * pSign, int nBits ) +{ + int Remainder, nWords; + int w, i; + + Remainder = (nBits%(sizeof(unsigned)*8)); + nWords = (nBits/(sizeof(unsigned)*8)) + (Remainder>0); + + for ( w = nWords-1; w >= 0; w-- ) + for ( i = ((w == nWords-1 && Remainder)? Remainder-1: 31); i >= 0; i-- ) + fprintf( pFile, "%c", '0' + (int)((pSign[w] & (1<<i)) > 0) ); + +// fprintf( pFile, "\n" ); +} + +/**Function************************************************************* + + Synopsis [Sets up the mask.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_GetMaxLevel( Fraig_Man_t * pMan ) +{ + int nLevelMax, i; + nLevelMax = 0; + for ( i = 0; i < pMan->vOutputs->nSize; i++ ) + nLevelMax = nLevelMax > Fraig_Regular(pMan->vOutputs->pArray[i])->Level? + nLevelMax : Fraig_Regular(pMan->vOutputs->pArray[i])->Level; + return nLevelMax; +} + +/**Function************************************************************* + + Synopsis [Analyses choice nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_MappingUpdateLevel_rec( Fraig_Man_t * pMan, Fraig_Node_t * pNode, int fMaximum ) +{ + Fraig_Node_t * pTemp; + int Level1, Level2, LevelE; + assert( !Fraig_IsComplement(pNode) ); + if ( !Fraig_NodeIsAnd(pNode) ) + return pNode->Level; + // skip the visited node + if ( pNode->TravId == pMan->nTravIds ) + return pNode->Level; + pNode->TravId = pMan->nTravIds; + // compute levels of the children nodes + Level1 = Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pNode->p1), fMaximum ); + Level2 = Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pNode->p2), fMaximum ); + pNode->Level = 1 + FRAIG_MAX( Level1, Level2 ); + if ( pNode->pNextE ) + { + LevelE = Fraig_MappingUpdateLevel_rec( pMan, pNode->pNextE, fMaximum ); + if ( fMaximum ) + { + if ( pNode->Level < LevelE ) + pNode->Level = LevelE; + } + else + { + if ( pNode->Level > LevelE ) + pNode->Level = LevelE; + } + // set the level of all equivalent nodes to be the same minimum + if ( pNode->pRepr == NULL ) // the primary node + for ( pTemp = pNode->pNextE; pTemp; pTemp = pTemp->pNextE ) + pTemp->Level = pNode->Level; + } + return pNode->Level; +} + +/**Function************************************************************* + + Synopsis [Resets the levels of the nodes in the choice graph.] + + Description [Makes the level of the choice nodes to be equal to the + maximum of the level of the nodes in the equivalence class. This way + sorting by level leads to the reverse topological order, which is + needed for the required time computation.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_MappingSetChoiceLevels( Fraig_Man_t * pMan, int fMaximum ) +{ + int i; + pMan->nTravIds++; + for ( i = 0; i < pMan->vOutputs->nSize; i++ ) + Fraig_MappingUpdateLevel_rec( pMan, Fraig_Regular(pMan->vOutputs->pArray[i]), fMaximum ); +} + +/**Function************************************************************* + + Synopsis [Reports statistics on choice nodes.] + + Description [The number of choice nodes is the number of primary nodes, + which has pNextE set to a pointer. The number of choices is the number + of entries in the equivalent-node lists of the primary nodes.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManReportChoices( Fraig_Man_t * pMan ) +{ + Fraig_Node_t * pNode, * pTemp; + int nChoiceNodes, nChoices; + int i, LevelMax1, LevelMax2; + + // report the number of levels + LevelMax1 = Fraig_GetMaxLevel( pMan ); + Fraig_MappingSetChoiceLevels( pMan, 0 ); + LevelMax2 = Fraig_GetMaxLevel( pMan ); + + // report statistics about choices + nChoiceNodes = nChoices = 0; + for ( i = 0; i < pMan->vNodes->nSize; i++ ) + { + pNode = pMan->vNodes->pArray[i]; + if ( pNode->pRepr == NULL && pNode->pNextE != NULL ) + { // this is a choice node = the primary node that has equivalent nodes + nChoiceNodes++; + for ( pTemp = pNode; pTemp; pTemp = pTemp->pNextE ) + nChoices++; + } + } + printf( "Maximum level: Original = %d. Reduced due to choices = %d.\n", LevelMax1, LevelMax2 ); + printf( "Choice stats: Choice nodes = %d. Total choices = %d.\n", nChoiceNodes, nChoices ); +} + +/**Function************************************************************* + + Synopsis [Returns 1 if the node is the root of EXOR/NEXOR gate.] + + Description [The node can be complemented.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsExorType( Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pNode1, * pNode2; + // make the node regular (it does not matter for EXOR/NEXOR) + pNode = Fraig_Regular(pNode); + // if the node or its children are not ANDs or not compl, this cannot be EXOR type + if ( !Fraig_NodeIsAnd(pNode) ) + return 0; + if ( !Fraig_NodeIsAnd(pNode->p1) || !Fraig_IsComplement(pNode->p1) ) + return 0; + if ( !Fraig_NodeIsAnd(pNode->p2) || !Fraig_IsComplement(pNode->p2) ) + return 0; + + // get children + pNode1 = Fraig_Regular(pNode->p1); + pNode2 = Fraig_Regular(pNode->p2); + assert( pNode1->Num < pNode2->Num ); + + // compare grandchildren + return pNode1->p1 == Fraig_Not(pNode2->p1) && pNode1->p2 == Fraig_Not(pNode2->p2); +} + +/**Function************************************************************* + + Synopsis [Returns 1 if the node is the root of MUX or EXOR/NEXOR.] + + Description [The node can be complemented.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsMuxType( Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pNode1, * pNode2; + + // make the node regular (it does not matter for EXOR/NEXOR) + pNode = Fraig_Regular(pNode); + // if the node or its children are not ANDs or not compl, this cannot be EXOR type + if ( !Fraig_NodeIsAnd(pNode) ) + return 0; + if ( !Fraig_NodeIsAnd(pNode->p1) || !Fraig_IsComplement(pNode->p1) ) + return 0; + if ( !Fraig_NodeIsAnd(pNode->p2) || !Fraig_IsComplement(pNode->p2) ) + return 0; + + // get children + pNode1 = Fraig_Regular(pNode->p1); + pNode2 = Fraig_Regular(pNode->p2); + assert( pNode1->Num < pNode2->Num ); + + // compare grandchildren + // node is an EXOR/NEXOR + if ( pNode1->p1 == Fraig_Not(pNode2->p1) && pNode1->p2 == Fraig_Not(pNode2->p2) ) + return 1; + + // otherwise the node is MUX iff it has a pair of equal grandchildren + return pNode1->p1 == Fraig_Not(pNode2->p1) || + pNode1->p1 == Fraig_Not(pNode2->p2) || + pNode1->p2 == Fraig_Not(pNode2->p1) || + pNode1->p2 == Fraig_Not(pNode2->p2); +} + +/**Function************************************************************* + + Synopsis [Returns 1 if the node is EXOR, 0 if it is NEXOR.] + + Description [The node should be EXOR type and not complemented.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsExor( Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pNode1; + assert( !Fraig_IsComplement(pNode) ); + assert( Fraig_NodeIsExorType(pNode) ); + assert( Fraig_IsComplement(pNode->p1) ); + // get children + pNode1 = Fraig_Regular(pNode->p1); + return Fraig_IsComplement(pNode1->p1) == Fraig_IsComplement(pNode1->p2); +} + +/**Function************************************************************* + + Synopsis [Recognizes what nodes are control and data inputs of a MUX.] + + Description [If the node is a MUX, returns the control variable C. + Assigns nodes T and E to be the then and else variables of the MUX. + Node C is never complemented. Nodes T and E can be complemented. + This function also recognizes EXOR/NEXOR gates as MUXes.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeRecognizeMux( Fraig_Node_t * pNode, Fraig_Node_t ** ppNodeT, Fraig_Node_t ** ppNodeE ) +{ + Fraig_Node_t * pNode1, * pNode2; + assert( !Fraig_IsComplement(pNode) ); + assert( Fraig_NodeIsMuxType(pNode) ); + // get children + pNode1 = Fraig_Regular(pNode->p1); + pNode2 = Fraig_Regular(pNode->p2); + // find the control variable + if ( pNode1->p1 == Fraig_Not(pNode2->p1) ) + { + if ( Fraig_IsComplement(pNode1->p1) ) + { // pNode2->p1 is positive phase of C + *ppNodeT = Fraig_Not(pNode2->p2); + *ppNodeE = Fraig_Not(pNode1->p2); + return pNode2->p1; + } + else + { // pNode1->p1 is positive phase of C + *ppNodeT = Fraig_Not(pNode1->p2); + *ppNodeE = Fraig_Not(pNode2->p2); + return pNode1->p1; + } + } + else if ( pNode1->p1 == Fraig_Not(pNode2->p2) ) + { + if ( Fraig_IsComplement(pNode1->p1) ) + { // pNode2->p2 is positive phase of C + *ppNodeT = Fraig_Not(pNode2->p1); + *ppNodeE = Fraig_Not(pNode1->p2); + return pNode2->p2; + } + else + { // pNode1->p1 is positive phase of C + *ppNodeT = Fraig_Not(pNode1->p2); + *ppNodeE = Fraig_Not(pNode2->p1); + return pNode1->p1; + } + } + else if ( pNode1->p2 == Fraig_Not(pNode2->p1) ) + { + if ( Fraig_IsComplement(pNode1->p2) ) + { // pNode2->p1 is positive phase of C + *ppNodeT = Fraig_Not(pNode2->p2); + *ppNodeE = Fraig_Not(pNode1->p1); + return pNode2->p1; + } + else + { // pNode1->p2 is positive phase of C + *ppNodeT = Fraig_Not(pNode1->p1); + *ppNodeE = Fraig_Not(pNode2->p2); + return pNode1->p2; + } + } + else if ( pNode1->p2 == Fraig_Not(pNode2->p2) ) + { + if ( Fraig_IsComplement(pNode1->p2) ) + { // pNode2->p2 is positive phase of C + *ppNodeT = Fraig_Not(pNode2->p1); + *ppNodeE = Fraig_Not(pNode1->p1); + return pNode2->p2; + } + else + { // pNode1->p2 is positive phase of C + *ppNodeT = Fraig_Not(pNode1->p1); + *ppNodeE = Fraig_Not(pNode2->p1); + return pNode1->p2; + } + } + assert( 0 ); // this is not MUX + return NULL; +} + +/**Function************************************************************* + + Synopsis [Counts the number of EXOR type nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManCountExors( Fraig_Man_t * pMan ) +{ + int i, nExors; + nExors = 0; + for ( i = 0; i < pMan->vNodes->nSize; i++ ) + nExors += Fraig_NodeIsExorType( pMan->vNodes->pArray[i] ); + return nExors; + +} + +/**Function************************************************************* + + Synopsis [Counts the number of EXOR type nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManCountMuxes( Fraig_Man_t * pMan ) +{ + int i, nMuxes; + nMuxes = 0; + for ( i = 0; i < pMan->vNodes->nSize; i++ ) + nMuxes += Fraig_NodeIsMuxType( pMan->vNodes->pArray[i] ); + return nMuxes; + +} + +/**Function************************************************************* + + Synopsis [Returns 1 if siminfo of Node1 is contained in siminfo of Node2.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeSimsContained( Fraig_Man_t * pMan, Fraig_Node_t * pNode1, Fraig_Node_t * pNode2 ) +{ + unsigned * pUnsigned1, * pUnsigned2; + int i; + + // compare random siminfo + pUnsigned1 = pNode1->puSimR; + pUnsigned2 = pNode2->puSimR; + for ( i = 0; i < pMan->nWordsRand; i++ ) + if ( pUnsigned1[i] & ~pUnsigned2[i] ) + return 0; + + // compare systematic siminfo + pUnsigned1 = pNode1->puSimD; + pUnsigned2 = pNode2->puSimD; + for ( i = 0; i < pMan->iWordStart; i++ ) + if ( pUnsigned1[i] & ~pUnsigned2[i] ) + return 0; + + return 1; +} + +/**Function************************************************************* + + Synopsis [Count the number of PI variables.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_CountPis( Fraig_Man_t * p, Msat_IntVec_t * vVarNums ) +{ + int * pVars, nVars, i, Counter; + + nVars = Msat_IntVecReadSize(vVarNums); + pVars = Msat_IntVecReadArray(vVarNums); + Counter = 0; + for ( i = 0; i < nVars; i++ ) + Counter += Fraig_NodeIsVar( p->vNodes->pArray[pVars[i]] ); + return Counter; +} + + + +/**Function************************************************************* + + Synopsis [Counts the number of EXOR type nodes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_ManPrintRefs( Fraig_Man_t * pMan ) +{ + Fraig_NodeVec_t * vPivots; + Fraig_Node_t * pNode, * pNode2; + int i, k, Counter, nProved; + int clk; + + vPivots = Fraig_NodeVecAlloc( 1000 ); + for ( i = 0; i < pMan->vNodes->nSize; i++ ) + { + pNode = pMan->vNodes->pArray[i]; + + if ( pNode->nOnes == 0 || pNode->nOnes == (unsigned)pMan->nWordsRand * 32 ) + continue; + + if ( pNode->nRefs > 5 ) + { + Fraig_NodeVecPush( vPivots, pNode ); +// printf( "Node %6d : nRefs = %2d Level = %3d.\n", pNode->Num, pNode->nRefs, pNode->Level ); + } + } + printf( "Total nodes = %d. Referenced nodes = %d.\n", pMan->vNodes->nSize, vPivots->nSize ); + +clk = clock(); + // count implications + Counter = nProved = 0; + for ( i = 0; i < vPivots->nSize; i++ ) + for ( k = i+1; k < vPivots->nSize; k++ ) + { + pNode = vPivots->pArray[i]; + pNode2 = vPivots->pArray[k]; + if ( Fraig_NodeSimsContained( pMan, pNode, pNode2 ) ) + { + if ( Fraig_NodeIsImplication( pMan, pNode, pNode2, -1 ) ) + nProved++; + Counter++; + } + else if ( Fraig_NodeSimsContained( pMan, pNode2, pNode ) ) + { + if ( Fraig_NodeIsImplication( pMan, pNode2, pNode, -1 ) ) + nProved++; + Counter++; + } + } + printf( "Number of candidate pairs = %d. Proved = %d.\n", Counter, nProved ); +PRT( "Time", clock() - clk ); + return 0; +} + + +/**Function************************************************************* + + Synopsis [Checks if pNew exists among the implication fanins of pOld.] + + Description [If pNew is an implication fanin of pOld, returns 1. + If Fraig_Not(pNew) is an implication fanin of pOld, return -1. + Otherwise returns 0.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsInSupergate( Fraig_Node_t * pOld, Fraig_Node_t * pNew ) +{ + int RetValue1, RetValue2; + if ( Fraig_Regular(pOld) == Fraig_Regular(pNew) ) + return (pOld == pNew)? 1 : -1; + if ( Fraig_IsComplement(pOld) || Fraig_NodeIsVar(pOld) ) + return 0; + RetValue1 = Fraig_NodeIsInSupergate( pOld->p1, pNew ); + RetValue2 = Fraig_NodeIsInSupergate( pOld->p2, pNew ); + if ( RetValue1 == -1 || RetValue2 == -1 ) + return -1; + if ( RetValue1 == 1 || RetValue2 == 1 ) + return 1; + return 0; +} + + +/**Function************************************************************* + + Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_CollectSupergate_rec( Fraig_Node_t * pNode, Fraig_NodeVec_t * vSuper, int fFirst, int fStopAtMux ) +{ + // if the new node is complemented or a PI, another gate begins +// if ( Fraig_IsComplement(pNode) || Fraig_NodeIsVar(pNode) || Fraig_NodeIsMuxType(pNode) ) + if ( (!fFirst && Fraig_Regular(pNode)->nRefs > 1) || + Fraig_IsComplement(pNode) || Fraig_NodeIsVar(pNode) || + (fStopAtMux && Fraig_NodeIsMuxType(pNode)) ) + { + Fraig_NodeVecPushUnique( vSuper, pNode ); + return; + } + // go through the branches + Fraig_CollectSupergate_rec( pNode->p1, vSuper, 0, fStopAtMux ); + Fraig_CollectSupergate_rec( pNode->p2, vSuper, 0, fStopAtMux ); +} + +/**Function************************************************************* + + Synopsis [Returns the array of nodes to be combined into one multi-input AND-gate.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_CollectSupergate( Fraig_Node_t * pNode, int fStopAtMux ) +{ + Fraig_NodeVec_t * vSuper; + vSuper = Fraig_NodeVecAlloc( 8 ); + Fraig_CollectSupergate_rec( pNode, vSuper, 1, fStopAtMux ); + return vSuper; +} + + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_ManIncrementTravId( Fraig_Man_t * pMan ) +{ + pMan->nTravIds2++; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeSetTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + pNode->TravId2 = pMan->nTravIds2; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsTravIdCurrent( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + return pNode->TravId2 == pMan->nTravIds2; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeIsTravIdPrevious( Fraig_Man_t * pMan, Fraig_Node_t * pNode ) +{ + return pNode->TravId2 == pMan->nTravIds2 - 1; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/fraig/fraigVec.c b/src/sat/fraig/fraigVec.c new file mode 100644 index 00000000..ba3feecd --- /dev/null +++ b/src/sat/fraig/fraigVec.c @@ -0,0 +1,545 @@ +/**CFile**************************************************************** + + FileName [fraigVec.c] + + PackageName [FRAIG: Functionally reduced AND-INV graphs.] + + Synopsis [Vector of FRAIG nodes.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 2.0. Started - October 1, 2004] + + Revision [$Id: fraigVec.c,v 1.7 2005/07/08 01:01:34 alanmi Exp $] + +***********************************************************************/ + +#include "fraigInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates a vector with the given capacity.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_NodeVecAlloc( int nCap ) +{ + Fraig_NodeVec_t * p; + p = ALLOC( Fraig_NodeVec_t, 1 ); + if ( nCap > 0 && nCap < 8 ) + nCap = 8; + p->nSize = 0; + p->nCap = nCap; + p->pArray = p->nCap? ALLOC( Fraig_Node_t *, p->nCap ) : NULL; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecFree( Fraig_NodeVec_t * p ) +{ + FREE( p->pArray ); + FREE( p ); +} + +/**Function************************************************************* + + Synopsis [Duplicates the integer array.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_NodeVec_t * Fraig_NodeVecDup( Fraig_NodeVec_t * pVec ) +{ + Fraig_NodeVec_t * p; + p = ALLOC( Fraig_NodeVec_t, 1 ); + p->nSize = pVec->nSize; + p->nCap = pVec->nCap; + p->pArray = p->nCap? ALLOC( Fraig_Node_t *, p->nCap ) : NULL; + memcpy( p->pArray, pVec->pArray, sizeof(Fraig_Node_t *) * pVec->nSize ); + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t ** Fraig_NodeVecReadArray( Fraig_NodeVec_t * p ) +{ + return p->pArray; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeVecReadSize( Fraig_NodeVec_t * p ) +{ + return p->nSize; +} + +/**Function************************************************************* + + Synopsis [Resizes the vector to the given capacity.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecGrow( Fraig_NodeVec_t * p, int nCapMin ) +{ + if ( p->nCap >= nCapMin ) + return; + p->pArray = REALLOC( Fraig_Node_t *, p->pArray, nCapMin ); + p->nCap = nCapMin; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecShrink( Fraig_NodeVec_t * p, int nSizeNew ) +{ + assert( p->nSize >= nSizeNew ); + p->nSize = nSizeNew; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecClear( Fraig_NodeVec_t * p ) +{ + p->nSize = 0; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecPush( Fraig_NodeVec_t * p, Fraig_Node_t * Entry ) +{ + if ( p->nSize == p->nCap ) + { + if ( p->nCap < 16 ) + Fraig_NodeVecGrow( p, 16 ); + else + Fraig_NodeVecGrow( p, 2 * p->nCap ); + } + p->pArray[p->nSize++] = Entry; +} + +/**Function************************************************************* + + Synopsis [Add the element while ensuring uniqueness.] + + Description [Returns 1 if the element was found, and 0 if it was new. ] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeVecPushUnique( Fraig_NodeVec_t * p, Fraig_Node_t * Entry ) +{ + int i; + for ( i = 0; i < p->nSize; i++ ) + if ( p->pArray[i] == Entry ) + return 1; + Fraig_NodeVecPush( p, Entry ); + return 0; +} + +/**Function************************************************************* + + Synopsis [Inserts a new node in the order by arrival times.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecPushOrder( Fraig_NodeVec_t * p, Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pNode1, * pNode2; + int i; + Fraig_NodeVecPush( p, pNode ); + // find the p of the node + for ( i = p->nSize-1; i > 0; i-- ) + { + pNode1 = p->pArray[i ]; + pNode2 = p->pArray[i-1]; + if ( pNode1 >= pNode2 ) + break; + p->pArray[i ] = pNode2; + p->pArray[i-1] = pNode1; + } +} + +/**Function************************************************************* + + Synopsis [Add the element while ensuring uniqueness in the order.] + + Description [Returns 1 if the element was found, and 0 if it was new. ] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeVecPushUniqueOrder( Fraig_NodeVec_t * p, Fraig_Node_t * pNode ) +{ + int i; + for ( i = 0; i < p->nSize; i++ ) + if ( p->pArray[i] == pNode ) + return 1; + Fraig_NodeVecPushOrder( p, pNode ); + return 0; +} + +/**Function************************************************************* + + Synopsis [Inserts a new node in the order by arrival times.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecPushOrderByLevel( Fraig_NodeVec_t * p, Fraig_Node_t * pNode ) +{ + Fraig_Node_t * pNode1, * pNode2; + int i; + Fraig_NodeVecPush( p, pNode ); + // find the p of the node + for ( i = p->nSize-1; i > 0; i-- ) + { + pNode1 = p->pArray[i ]; + pNode2 = p->pArray[i-1]; + if ( Fraig_Regular(pNode1)->Level <= Fraig_Regular(pNode2)->Level ) + break; + p->pArray[i ] = pNode2; + p->pArray[i-1] = pNode1; + } +} + +/**Function************************************************************* + + Synopsis [Add the element while ensuring uniqueness in the order.] + + Description [Returns 1 if the element was found, and 0 if it was new. ] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeVecPushUniqueOrderByLevel( Fraig_NodeVec_t * p, Fraig_Node_t * pNode ) +{ + int i; + for ( i = 0; i < p->nSize; i++ ) + if ( p->pArray[i] == pNode ) + return 1; + Fraig_NodeVecPushOrderByLevel( p, pNode ); + return 0; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeVecPop( Fraig_NodeVec_t * p ) +{ + return p->pArray[--p->nSize]; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecRemove( Fraig_NodeVec_t * p, Fraig_Node_t * Entry ) +{ + int i; + for ( i = 0; i < p->nSize; i++ ) + if ( p->pArray[i] == Entry ) + break; + assert( i < p->nSize ); + for ( i++; i < p->nSize; i++ ) + p->pArray[i-1] = p->pArray[i]; + p->nSize--; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecWriteEntry( Fraig_NodeVec_t * p, int i, Fraig_Node_t * Entry ) +{ + assert( i >= 0 && i < p->nSize ); + p->pArray[i] = Entry; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Fraig_Node_t * Fraig_NodeVecReadEntry( Fraig_NodeVec_t * p, int i ) +{ + assert( i >= 0 && i < p->nSize ); + return p->pArray[i]; +} + +/**Function************************************************************* + + Synopsis [Comparison procedure for two clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeVecCompareLevelsIncreasing( Fraig_Node_t ** pp1, Fraig_Node_t ** pp2 ) +{ + int Level1 = Fraig_Regular(*pp1)->Level; + int Level2 = Fraig_Regular(*pp2)->Level; + if ( Level1 < Level2 ) + return -1; + if ( Level1 > Level2 ) + return 1; + return 0; +} + +/**Function************************************************************* + + Synopsis [Comparison procedure for two clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeVecCompareLevelsDecreasing( Fraig_Node_t ** pp1, Fraig_Node_t ** pp2 ) +{ + int Level1 = Fraig_Regular(*pp1)->Level; + int Level2 = Fraig_Regular(*pp2)->Level; + if ( Level1 > Level2 ) + return -1; + if ( Level1 < Level2 ) + return 1; + return 0; +} + +/**Function************************************************************* + + Synopsis [Comparison procedure for two clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeVecCompareNumbers( Fraig_Node_t ** pp1, Fraig_Node_t ** pp2 ) +{ + int Num1 = Fraig_Regular(*pp1)->Num; + int Num2 = Fraig_Regular(*pp2)->Num; + if ( Num1 < Num2 ) + return -1; + if ( Num1 > Num2 ) + return 1; + return 0; +} + +/**Function************************************************************* + + Synopsis [Comparison procedure for two clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Fraig_NodeVecCompareRefCounts( Fraig_Node_t ** pp1, Fraig_Node_t ** pp2 ) +{ + int nRefs1 = Fraig_Regular(*pp1)->nRefs; + int nRefs2 = Fraig_Regular(*pp2)->nRefs; + + if ( nRefs1 < nRefs2 ) + return -1; + if ( nRefs1 > nRefs2 ) + return 1; + + nRefs1 = Fraig_Regular(*pp1)->Level; + nRefs2 = Fraig_Regular(*pp2)->Level; + + if ( nRefs1 < nRefs2 ) + return -1; + if ( nRefs1 > nRefs2 ) + return 1; + return 0; +} + +/**Function************************************************************* + + Synopsis [Sorting the entries by their integer value.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecSortByLevel( Fraig_NodeVec_t * p, int fIncreasing ) +{ + if ( fIncreasing ) + qsort( (void *)p->pArray, p->nSize, sizeof(Fraig_Node_t *), + (int (*)(const void *, const void *)) Fraig_NodeVecCompareLevelsIncreasing ); + else + qsort( (void *)p->pArray, p->nSize, sizeof(Fraig_Node_t *), + (int (*)(const void *, const void *)) Fraig_NodeVecCompareLevelsDecreasing ); +} + +/**Function************************************************************* + + Synopsis [Sorting the entries by their integer value.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecSortByNumber( Fraig_NodeVec_t * p ) +{ + qsort( (void *)p->pArray, p->nSize, sizeof(Fraig_Node_t *), + (int (*)(const void *, const void *)) Fraig_NodeVecCompareNumbers ); +} + +/**Function************************************************************* + + Synopsis [Sorting the entries by their integer value.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Fraig_NodeVecSortByRefCount( Fraig_NodeVec_t * p ) +{ + qsort( (void *)p->pArray, p->nSize, sizeof(Fraig_Node_t *), + (int (*)(const void *, const void *)) Fraig_NodeVecCompareRefCounts ); +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + diff --git a/src/sat/fraig/module.make b/src/sat/fraig/module.make new file mode 100644 index 00000000..cc6eb9d3 --- /dev/null +++ b/src/sat/fraig/module.make @@ -0,0 +1,12 @@ +SRC += src/sat/fraig/fraigApi.c \ + src/sat/fraig/fraigCanon.c \ + src/sat/fraig/fraigFanout.c \ + src/sat/fraig/fraigFeed.c \ + src/sat/fraig/fraigMan.c \ + src/sat/fraig/fraigMem.c \ + src/sat/fraig/fraigNode.c \ + src/sat/fraig/fraigPrime.c \ + src/sat/fraig/fraigSat.c \ + src/sat/fraig/fraigTable.c \ + src/sat/fraig/fraigUtil.c \ + src/sat/fraig/fraigVec.c diff --git a/src/sat/msat/module.make b/src/sat/msat/module.make new file mode 100644 index 00000000..0dadfbe1 --- /dev/null +++ b/src/sat/msat/module.make @@ -0,0 +1,13 @@ +SRC += src/sat/msat/msatActivity.c \ + src/sat/msat/msatClause.c \ + src/sat/msat/msatClauseVec.c \ + src/sat/msat/msatMem.c \ + src/sat/msat/msatOrderJ.c \ + src/sat/msat/msatQueue.c \ + src/sat/msat/msatRead.c \ + src/sat/msat/msatSolverApi.c \ + src/sat/msat/msatSolverCore.c \ + src/sat/msat/msatSolverIo.c \ + src/sat/msat/msatSolverSearch.c \ + src/sat/msat/msatSort.c \ + src/sat/msat/msatVec.c diff --git a/src/sat/msat/msat.h b/src/sat/msat/msat.h new file mode 100644 index 00000000..53353ba6 --- /dev/null +++ b/src/sat/msat/msat.h @@ -0,0 +1,172 @@ +/**CFile**************************************************************** + + FileName [msat.h] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [External definitions of the solver.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msat.h,v 1.6 2004/05/12 06:30:20 satrajit Exp $] + +***********************************************************************/ + +#ifndef __MSAT_H__ +#define __MSAT_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +//////////////////////////////////////////////////////////////////////// +/// INCLUDES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// PARAMETERS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// STRUCTURE DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +#ifdef bool +#undef bool +#endif + +#ifndef __MVTYPES_H__ +typedef int bool; +#endif + +typedef struct Msat_Solver_t_ Msat_Solver_t; + +// the vector of intergers and of clauses +typedef struct Msat_IntVec_t_ Msat_IntVec_t; +typedef struct Msat_ClauseVec_t_ Msat_ClauseVec_t; +typedef struct Msat_VarHeap_t_ Msat_VarHeap_t; + +// the return value of the solver +typedef enum { MSAT_FALSE = -1, MSAT_UNKNOWN = 0, MSAT_TRUE = 1 } Msat_Type_t; + +// representation of variables and literals +// the literal (l) is the variable (v) and the sign (s) +// s = 0 the variable is positive +// s = 1 the variable is negative +#define MSAT_VAR2LIT(v,s) (2*(v)+(s)) +#define MSAT_LITNOT(l) ((l)^1) +#define MSAT_LITSIGN(l) ((l)&1) +#define MSAT_LIT2VAR(l) ((l)>>1) + +//////////////////////////////////////////////////////////////////////// +/// GLOBAL VARIABLES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// MACRO DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +/*=== satRead.c ============================================================*/ +extern bool Msat_SolverParseDimacs( FILE * pFile, Msat_Solver_t ** p, int fVerbose ); +/*=== satSolver.c ===========================================================*/ +// adding vars, clauses, simplifying the database, and solving +extern bool Msat_SolverAddVar( Msat_Solver_t * p, int Level ); +extern bool Msat_SolverAddClause( Msat_Solver_t * p, Msat_IntVec_t * pLits ); +extern bool Msat_SolverSimplifyDB( Msat_Solver_t * p ); +extern bool Msat_SolverSolve( Msat_Solver_t * p, Msat_IntVec_t * pVecAssumps, int nBackTrackLimit, int nTimeLimit ); +// printing stats, assignments, and clauses +extern void Msat_SolverPrintStats( Msat_Solver_t * p ); +extern void Msat_SolverPrintAssignment( Msat_Solver_t * p ); +extern void Msat_SolverPrintClauses( Msat_Solver_t * p ); +extern void Msat_SolverWriteDimacs( Msat_Solver_t * p, char * pFileName ); +// access to the solver internal data +extern int Msat_SolverReadVarNum( Msat_Solver_t * p ); +extern int Msat_SolverReadClauseNum( Msat_Solver_t * p ); +extern int Msat_SolverReadVarAllocNum( Msat_Solver_t * p ); +extern int * Msat_SolverReadAssignsArray( Msat_Solver_t * p ); +extern int * Msat_SolverReadModelArray( Msat_Solver_t * p ); +extern unsigned Msat_SolverReadTruth( Msat_Solver_t * p ); +extern int Msat_SolverReadBackTracks( Msat_Solver_t * p ); +extern int Msat_SolverReadInspects( Msat_Solver_t * p ); +extern void Msat_SolverSetVerbosity( Msat_Solver_t * p, int fVerbose ); +extern void Msat_SolverSetProofWriting( Msat_Solver_t * p, int fProof ); +extern void Msat_SolverSetVarTypeA( Msat_Solver_t * p, int Var ); +extern void Msat_SolverSetVarMap( Msat_Solver_t * p, Msat_IntVec_t * vVarMap ); +extern void Msat_SolverMarkLastClauseTypeA( Msat_Solver_t * p ); +extern void Msat_SolverMarkClausesStart( Msat_Solver_t * p ); +extern float * Msat_SolverReadFactors( Msat_Solver_t * p ); +// returns the solution after incremental solving +extern int Msat_SolverReadSolutions( Msat_Solver_t * p ); +extern int * Msat_SolverReadSolutionsArray( Msat_Solver_t * p ); +extern Msat_ClauseVec_t * Msat_SolverReadAdjacents( Msat_Solver_t * p ); +extern Msat_IntVec_t * Msat_SolverReadConeVars( Msat_Solver_t * p ); +extern Msat_IntVec_t * Msat_SolverReadVarsUsed( Msat_Solver_t * p ); +/*=== satSolverSearch.c ===========================================================*/ +extern void Msat_SolverRemoveLearned( Msat_Solver_t * p ); +extern void Msat_SolverRemoveMarked( Msat_Solver_t * p ); +/*=== satSolverApi.c ===========================================================*/ +// allocation, cleaning, and freeing the solver +extern Msat_Solver_t * Msat_SolverAlloc( int nVars, double dClaInc, double dClaDecay, double dVarInc, double dVarDecay, bool fVerbose ); +extern void Msat_SolverResize( Msat_Solver_t * pMan, int nVarsAlloc ); +extern void Msat_SolverClean( Msat_Solver_t * p, int nVars ); +extern void Msat_SolverPrepare( Msat_Solver_t * pSat, Msat_IntVec_t * vVars ); +extern void Msat_SolverFree( Msat_Solver_t * p ); +/*=== satVec.c ===========================================================*/ +extern Msat_IntVec_t * Msat_IntVecAlloc( int nCap ); +extern Msat_IntVec_t * Msat_IntVecAllocArray( int * pArray, int nSize ); +extern Msat_IntVec_t * Msat_IntVecAllocArrayCopy( int * pArray, int nSize ); +extern Msat_IntVec_t * Msat_IntVecDup( Msat_IntVec_t * pVec ); +extern Msat_IntVec_t * Msat_IntVecDupArray( Msat_IntVec_t * pVec ); +extern void Msat_IntVecFree( Msat_IntVec_t * p ); +extern void Msat_IntVecFill( Msat_IntVec_t * p, int nSize, int Entry ); +extern int * Msat_IntVecReleaseArray( Msat_IntVec_t * p ); +extern int * Msat_IntVecReadArray( Msat_IntVec_t * p ); +extern int Msat_IntVecReadSize( Msat_IntVec_t * p ); +extern int Msat_IntVecReadEntry( Msat_IntVec_t * p, int i ); +extern int Msat_IntVecReadEntryLast( Msat_IntVec_t * p ); +extern void Msat_IntVecWriteEntry( Msat_IntVec_t * p, int i, int Entry ); +extern void Msat_IntVecGrow( Msat_IntVec_t * p, int nCapMin ); +extern void Msat_IntVecShrink( Msat_IntVec_t * p, int nSizeNew ); +extern void Msat_IntVecClear( Msat_IntVec_t * p ); +extern void Msat_IntVecPush( Msat_IntVec_t * p, int Entry ); +extern int Msat_IntVecPushUnique( Msat_IntVec_t * p, int Entry ); +extern void Msat_IntVecPushUniqueOrder( Msat_IntVec_t * p, int Entry, int fIncrease ); +extern int Msat_IntVecPop( Msat_IntVec_t * p ); +extern void Msat_IntVecSort( Msat_IntVec_t * p, int fReverse ); +/*=== satHeap.c ===========================================================*/ +extern Msat_VarHeap_t * Msat_VarHeapAlloc(); +extern void Msat_VarHeapSetActivity( Msat_VarHeap_t * p, double * pActivity ); +extern void Msat_VarHeapStart( Msat_VarHeap_t * p, int * pVars, int nVars, int nVarsAlloc ); +extern void Msat_VarHeapGrow( Msat_VarHeap_t * p, int nSize ); +extern void Msat_VarHeapStop( Msat_VarHeap_t * p ); +extern void Msat_VarHeapPrint( FILE * pFile, Msat_VarHeap_t * p ); +extern void Msat_VarHeapCheck( Msat_VarHeap_t * p ); +extern void Msat_VarHeapCheckOne( Msat_VarHeap_t * p, int iVar ); +extern int Msat_VarHeapContainsVar( Msat_VarHeap_t * p, int iVar ); +extern void Msat_VarHeapInsert( Msat_VarHeap_t * p, int iVar ); +extern void Msat_VarHeapUpdate( Msat_VarHeap_t * p, int iVar ); +extern void Msat_VarHeapDelete( Msat_VarHeap_t * p, int iVar ); +extern double Msat_VarHeapReadMaxWeight( Msat_VarHeap_t * p ); +extern int Msat_VarHeapCountNodes( Msat_VarHeap_t * p, double WeightLimit ); +extern int Msat_VarHeapReadMax( Msat_VarHeap_t * p ); +extern int Msat_VarHeapGetMax( Msat_VarHeap_t * p ); + +#ifdef __cplusplus +} +#endif + +#endif + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// diff --git a/src/sat/msat/msatActivity.c b/src/sat/msat/msatActivity.c new file mode 100644 index 00000000..1cd795bd --- /dev/null +++ b/src/sat/msat/msatActivity.c @@ -0,0 +1,160 @@ +/**CFile**************************************************************** + + FileName [msatActivity.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Procedures controlling activity of variables and clauses.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatActivity.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverVarBumpActivity( Msat_Solver_t * p, Msat_Lit_t Lit ) +{ + Msat_Var_t Var; + if ( p->dVarDecay < 0 ) // (negative decay means static variable order -- don't bump) + return; + Var = MSAT_LIT2VAR(Lit); + p->pdActivity[Var] += p->dVarInc; +// p->pdActivity[Var] += p->dVarInc * p->pFactors[Var]; + if ( p->pdActivity[Var] > 1e100 ) + Msat_SolverVarRescaleActivity( p ); + Msat_OrderUpdate( p->pOrder, Var ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverVarDecayActivity( Msat_Solver_t * p ) +{ + if ( p->dVarDecay >= 0 ) + p->dVarInc *= p->dVarDecay; +} + +/**Function************************************************************* + + Synopsis [Divide all variable activities by 1e100.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverVarRescaleActivity( Msat_Solver_t * p ) +{ + int i; + for ( i = 0; i < p->nVars; i++ ) + p->pdActivity[i] *= 1e-100; + p->dVarInc *= 1e-100; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverClaBumpActivity( Msat_Solver_t * p, Msat_Clause_t * pC ) +{ + float Activ; + Activ = Msat_ClauseReadActivity(pC); + if ( Activ + p->dClaInc > 1e20 ) + { + Msat_SolverClaRescaleActivity( p ); + Activ = Msat_ClauseReadActivity( pC ); + } + Msat_ClauseWriteActivity( pC, Activ + (float)p->dClaInc ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverClaDecayActivity( Msat_Solver_t * p ) +{ + p->dClaInc *= p->dClaDecay; +} + +/**Function************************************************************* + + Synopsis [Divide all constraint activities by 1e20.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverClaRescaleActivity( Msat_Solver_t * p ) +{ + Msat_Clause_t ** pLearned; + int nLearned, i; + float Activ; + nLearned = Msat_ClauseVecReadSize( p->vLearned ); + pLearned = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = 0; i < nLearned; i++ ) + { + Activ = Msat_ClauseReadActivity( pLearned[i] ); + Msat_ClauseWriteActivity( pLearned[i], Activ * (float)1e-20 ); + } + p->dClaInc *= 1e-20; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatClause.c b/src/sat/msat/msatClause.c new file mode 100644 index 00000000..2ba8cd32 --- /dev/null +++ b/src/sat/msat/msatClause.c @@ -0,0 +1,529 @@ +/**CFile**************************************************************** + + FileName [msatClause.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Procedures working with SAT clauses.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatClause.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +struct Msat_Clause_t_ +{ + int Num; // unique number of the clause + unsigned fLearned : 1; // 1 if the clause is learned + unsigned fMark : 1; // used to mark visited clauses during proof recording + unsigned fTypeA : 1; // used to mark clauses belonging to A for interpolant computation + unsigned nSize : 14; // the number of literals in the clause + unsigned nSizeAlloc : 15; // the number of bytes allocated for the clause + Msat_Lit_t pData[0]; +}; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Creates a new clause.] + + Description [Returns FALSE if top-level conflict detected (must be handled); + TRUE otherwise. 'pClause_out' may be set to NULL if clause is already + satisfied by the top-level assignment.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_ClauseCreate( Msat_Solver_t * p, Msat_IntVec_t * vLits, bool fLearned, Msat_Clause_t ** pClause_out ) +{ + int * pAssigns = Msat_SolverReadAssignsArray(p); + Msat_ClauseVec_t ** pvWatched; + Msat_Clause_t * pC; + int * pLits; + int nLits, i, j; + int nBytes; + Msat_Var_t Var; + bool Sign; + + *pClause_out = NULL; + + nLits = Msat_IntVecReadSize(vLits); + pLits = Msat_IntVecReadArray(vLits); + + if ( !fLearned ) + { + int * pSeen = Msat_SolverReadSeenArray( p ); + int nSeenId; + assert( Msat_SolverReadDecisionLevel(p) == 0 ); + // sorting literals makes the code trace-equivalent + // with to the original C++ solver + Msat_IntVecSort( vLits, 0 ); + // increment the counter of seen twice + nSeenId = Msat_SolverIncrementSeenId( p ); + nSeenId = Msat_SolverIncrementSeenId( p ); + // nSeenId - 1 stands for negative + // nSeenId stands for positive + // Remove false literals + + // there is a bug here!!!! + // when the same var in opposite polarities is given, it drops one polarity!!! + + for ( i = j = 0; i < nLits; i++ ) { + // get the corresponding variable + Var = MSAT_LIT2VAR(pLits[i]); + Sign = MSAT_LITSIGN(pLits[i]); // Sign=0 for positive + // check if we already saw this variable in the this clause + if ( pSeen[Var] >= nSeenId - 1 ) + { + if ( (pSeen[Var] != nSeenId) == Sign ) // the same lit + continue; + return 1; // two opposite polarity lits -- don't add the clause + } + // mark the variable as seen + pSeen[Var] = nSeenId - !Sign; + + // analize the value of this literal + if ( pAssigns[Var] != MSAT_VAR_UNASSIGNED ) + { + if ( pAssigns[Var] == pLits[i] ) + return 1; // the clause is always true -- don't add anything + // the literal has no impact - skip it + continue; + } + // otherwise, add this literal to the clause + pLits[j++] = pLits[i]; + } + Msat_IntVecShrink( vLits, j ); + nLits = j; +/* + // the problem with this code is that performance is very + // sensitive to the ordering of adjacency lits + // the best ordering requires fanins first, next fanouts + // this ordering is more convenient to make from FRAIG + + // create the adjacency information + if ( nLits > 2 ) + { + Msat_Var_t VarI, VarJ; + Msat_IntVec_t * pAdjI, * pAdjJ; + + for ( i = 0; i < nLits; i++ ) + { + VarI = MSAT_LIT2VAR(pLits[i]); + pAdjI = (Msat_IntVec_t *)p->vAdjacents->pArray[VarI]; + + for ( j = i+1; j < nLits; j++ ) + { + VarJ = MSAT_LIT2VAR(pLits[j]); + pAdjJ = (Msat_IntVec_t *)p->vAdjacents->pArray[VarJ]; + + Msat_IntVecPushUniqueOrder( pAdjI, VarJ, 1 ); + Msat_IntVecPushUniqueOrder( pAdjJ, VarI, 1 ); + } + } + } +*/ + } + // 'vLits' is now the (possibly) reduced vector of literals. + if ( nLits == 0 ) + return 0; + if ( nLits == 1 ) + return Msat_SolverEnqueue( p, pLits[0], NULL ); + + // Allocate clause: +// nBytes = sizeof(unsigned)*(nLits + 1 + (int)fLearned); + nBytes = sizeof(unsigned)*(nLits + 2 + (int)fLearned); +#ifdef USE_SYSTEM_MEMORY_MANAGEMENT + pC = (Msat_Clause_t *)ALLOC( char, nBytes ); +#else + pC = (Msat_Clause_t *)Msat_MmStepEntryFetch( Msat_SolverReadMem(p), nBytes ); +#endif + pC->Num = p->nClauses++; + pC->fTypeA = 0; + pC->fMark = 0; + pC->fLearned = fLearned; + pC->nSize = nLits; + pC->nSizeAlloc = nBytes; + memcpy( pC->pData, pLits, sizeof(int)*nLits ); + + // For learnt clauses only: + if ( fLearned ) + { + int * pLevel = Msat_SolverReadDecisionLevelArray( p ); + int iLevelMax, iLevelCur, iLitMax; + + // Put the second watch on the literal with highest decision level: + iLitMax = 1; + iLevelMax = pLevel[ MSAT_LIT2VAR(pLits[1]) ]; + for ( i = 2; i < nLits; i++ ) + { + iLevelCur = pLevel[ MSAT_LIT2VAR(pLits[i]) ]; + assert( iLevelCur != -1 ); + if ( iLevelMax < iLevelCur ) + // this is very strange - shouldn't it be??? + // if ( iLevelMax > iLevelCur ) + iLevelMax = iLevelCur, iLitMax = i; + } + pC->pData[1] = pLits[iLitMax]; + pC->pData[iLitMax] = pLits[1]; + + // Bumping: + // (newly learnt clauses should be considered active) + Msat_ClauseWriteActivity( pC, 0.0 ); + Msat_SolverClaBumpActivity( p, pC ); +// if ( nLits < 20 ) + for ( i = 0; i < nLits; i++ ) + { + Msat_SolverVarBumpActivity( p, pLits[i] ); +// Msat_SolverVarBumpActivity( p, pLits[i] ); +// p->pFreq[ MSAT_LIT2VAR(pLits[i]) ]++; + } + } + + // Store clause: + pvWatched = Msat_SolverReadWatchedArray( p ); + Msat_ClauseVecPush( pvWatched[ MSAT_LITNOT(pC->pData[0]) ], pC ); + Msat_ClauseVecPush( pvWatched[ MSAT_LITNOT(pC->pData[1]) ], pC ); + *pClause_out = pC; + return 1; +} + +/**Function************************************************************* + + Synopsis [Deallocates the clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseFree( Msat_Solver_t * p, Msat_Clause_t * pC, bool fRemoveWatched ) +{ + if ( fRemoveWatched ) + { + Msat_Lit_t Lit; + Msat_ClauseVec_t ** pvWatched; + pvWatched = Msat_SolverReadWatchedArray( p ); + Lit = MSAT_LITNOT( pC->pData[0] ); + Msat_ClauseRemoveWatch( pvWatched[Lit], pC ); + Lit = MSAT_LITNOT( pC->pData[1] ); + Msat_ClauseRemoveWatch( pvWatched[Lit], pC ); + } + +#ifdef USE_SYSTEM_MEMORY_MANAGEMENT + free( pC ); +#else + Msat_MmStepEntryRecycle( Msat_SolverReadMem(p), (char *)pC, pC->nSizeAlloc ); +#endif + +} + +/**Function************************************************************* + + Synopsis [Access the data field of the clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_ClauseReadLearned( Msat_Clause_t * pC ) { return pC->fLearned; } +int Msat_ClauseReadSize( Msat_Clause_t * pC ) { return pC->nSize; } +int * Msat_ClauseReadLits( Msat_Clause_t * pC ) { return pC->pData; } +bool Msat_ClauseReadMark( Msat_Clause_t * pC ) { return pC->fMark; } +int Msat_ClauseReadNum( Msat_Clause_t * pC ) { return pC->Num; } +bool Msat_ClauseReadTypeA( Msat_Clause_t * pC ) { return pC->fTypeA; } + +void Msat_ClauseSetMark( Msat_Clause_t * pC, bool fMark ) { pC->fMark = fMark; } +void Msat_ClauseSetNum( Msat_Clause_t * pC, int Num ) { pC->Num = Num; } +void Msat_ClauseSetTypeA( Msat_Clause_t * pC, bool fTypeA ) { pC->fTypeA = fTypeA; } + +/**Function************************************************************* + + Synopsis [Checks whether the learned clause is locked.] + + Description [The clause may be locked if it is the reason of a + recent conflict. Such clause cannot be removed from the database.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_ClauseIsLocked( Msat_Solver_t * p, Msat_Clause_t * pC ) +{ + Msat_Clause_t ** pReasons = Msat_SolverReadReasonArray( p ); + return (bool)(pReasons[MSAT_LIT2VAR(pC->pData[0])] == pC); +} + +/**Function************************************************************* + + Synopsis [Reads the activity of the given clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +float Msat_ClauseReadActivity( Msat_Clause_t * pC ) +{ + return *((float *)(pC->pData + pC->nSize)); +} + +/**Function************************************************************* + + Synopsis [Sets the activity of the clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseWriteActivity( Msat_Clause_t * pC, float Num ) +{ + *((float *)(pC->pData + pC->nSize)) = Num; +} + +/**Function************************************************************* + + Synopsis [Propages the assignment.] + + Description [The literal that has become true (Lit) is given to this + procedure. The array of current variable assignments is given for + efficiency. The output literal (pLit_out) can be the second watched + literal (if TRUE is returned) or the conflict literal (if FALSE is + returned). This messy interface is used to improve performance. + This procedure accounts for ~50% of the runtime of the solver.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_ClausePropagate( Msat_Clause_t * pC, Msat_Lit_t Lit, int * pAssigns, Msat_Lit_t * pLit_out ) +{ + // make sure the false literal is pC->pData[1] + Msat_Lit_t LitF = MSAT_LITNOT(Lit); + if ( pC->pData[0] == LitF ) + pC->pData[0] = pC->pData[1], pC->pData[1] = LitF; + assert( pC->pData[1] == LitF ); + // if the 0-th watch is true, clause is already satisfied + if ( pAssigns[MSAT_LIT2VAR(pC->pData[0])] == pC->pData[0] ) + return 1; + // look for a new watch + if ( pC->nSize > 2 ) + { + int i; + for ( i = 2; i < (int)pC->nSize; i++ ) + if ( pAssigns[MSAT_LIT2VAR(pC->pData[i])] != MSAT_LITNOT(pC->pData[i]) ) + { + pC->pData[1] = pC->pData[i], pC->pData[i] = LitF; + *pLit_out = MSAT_LITNOT(pC->pData[1]); + return 1; + } + } + // clause is unit under assignment + *pLit_out = pC->pData[0]; + return 0; +} + +/**Function************************************************************* + + Synopsis [Simplifies the clause.] + + Description [Assumes everything has been propagated! (esp. watches + in clauses are NOT unsatisfied)] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_ClauseSimplify( Msat_Clause_t * pC, int * pAssigns ) +{ + Msat_Var_t Var; + int i, j; + for ( i = j = 0; i < (int)pC->nSize; i++ ) + { + Var = MSAT_LIT2VAR(pC->pData[i]); + if ( pAssigns[Var] == MSAT_VAR_UNASSIGNED ) + { + pC->pData[j++] = pC->pData[i]; + continue; + } + if ( pAssigns[Var] == pC->pData[i] ) + return 1; + // otherwise, the value of the literal is false + // make sure, this literal is not watched + assert( i >= 2 ); + } + // if the size has changed, update it and move activity + if ( j < (int)pC->nSize ) + { + float Activ = Msat_ClauseReadActivity(pC); + pC->nSize = j; + Msat_ClauseWriteActivity(pC, Activ); + } + return 0; +} + +/**Function************************************************************* + + Synopsis [Computes reason of conflict in the given clause.] + + Description [If the literal is unassigned, finds the reason by + complementing literals in the given cluase (pC). If the literal is + assigned, makes sure that this literal is the first one in the clause + and computes the complement of all other literals in the clause. + Returns the reason in the given array (vLits_out). If the clause is + learned, bumps its activity.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseCalcReason( Msat_Solver_t * p, Msat_Clause_t * pC, Msat_Lit_t Lit, Msat_IntVec_t * vLits_out ) +{ + int i; + // clear the reason + Msat_IntVecClear( vLits_out ); + assert( Lit == MSAT_LIT_UNASSIGNED || Lit == pC->pData[0] ); + for ( i = (Lit != MSAT_LIT_UNASSIGNED); i < (int)pC->nSize; i++ ) + { + assert( Msat_SolverReadAssignsArray(p)[MSAT_LIT2VAR(pC->pData[i])] == MSAT_LITNOT(pC->pData[i]) ); + Msat_IntVecPush( vLits_out, MSAT_LITNOT(pC->pData[i]) ); + } + if ( pC->fLearned ) + Msat_SolverClaBumpActivity( p, pC ); +} + +/**Function************************************************************* + + Synopsis [Removes the given clause from the watched list.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseRemoveWatch( Msat_ClauseVec_t * vClauses, Msat_Clause_t * pC ) +{ + Msat_Clause_t ** pClauses; + int nClauses, i; + nClauses = Msat_ClauseVecReadSize( vClauses ); + pClauses = Msat_ClauseVecReadArray( vClauses ); + for ( i = 0; pClauses[i] != pC; i++ ) + assert( i < nClauses ); + for ( ; i < nClauses - 1; i++ ) + pClauses[i] = pClauses[i+1]; + Msat_ClauseVecPop( vClauses ); +} + +/**Function************************************************************* + + Synopsis [Prints the given clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClausePrint( Msat_Clause_t * pC ) +{ + int i; + if ( pC == NULL ) + printf( "NULL pointer" ); + else + { + if ( pC->fLearned ) + printf( "Act = %.4f ", Msat_ClauseReadActivity(pC) ); + for ( i = 0; i < (int)pC->nSize; i++ ) + printf( " %s%d", ((pC->pData[i]&1)? "-": ""), pC->pData[i]/2 + 1 ); + } + printf( "\n" ); +} + +/**Function************************************************************* + + Synopsis [Writes the given clause in a file in DIMACS format.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseWriteDimacs( FILE * pFile, Msat_Clause_t * pC, bool fIncrement ) +{ + int i; + for ( i = 0; i < (int)pC->nSize; i++ ) + fprintf( pFile, "%s%d ", ((pC->pData[i]&1)? "-": ""), pC->pData[i]/2 + (int)(fIncrement>0) ); + if ( fIncrement ) + fprintf( pFile, "0" ); + fprintf( pFile, "\n" ); +} + +/**Function************************************************************* + + Synopsis [Prints the given clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClausePrintSymbols( Msat_Clause_t * pC ) +{ + int i; + if ( pC == NULL ) + printf( "NULL pointer" ); + else + { +// if ( pC->fLearned ) +// printf( "Act = %.4f ", Msat_ClauseReadActivity(pC) ); + for ( i = 0; i < (int)pC->nSize; i++ ) + printf(" "L_LIT, L_lit(pC->pData[i])); + } + printf( "\n" ); +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatClauseVec.c b/src/sat/msat/msatClauseVec.c new file mode 100644 index 00000000..04691cf2 --- /dev/null +++ b/src/sat/msat/msatClauseVec.c @@ -0,0 +1,232 @@ +/**CFile**************************************************************** + + FileName [msatClauseVec.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Procedures working with arrays of SAT clauses.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatClauseVec.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates a vector with the given capacity.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_ClauseVec_t * Msat_ClauseVecAlloc( int nCap ) +{ + Msat_ClauseVec_t * p; + p = ALLOC( Msat_ClauseVec_t, 1 ); + if ( nCap > 0 && nCap < 16 ) + nCap = 16; + p->nSize = 0; + p->nCap = nCap; + p->pArray = p->nCap? ALLOC( Msat_Clause_t *, p->nCap ) : NULL; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseVecFree( Msat_ClauseVec_t * p ) +{ + FREE( p->pArray ); + FREE( p ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Clause_t ** Msat_ClauseVecReadArray( Msat_ClauseVec_t * p ) +{ + return p->pArray; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_ClauseVecReadSize( Msat_ClauseVec_t * p ) +{ + return p->nSize; +} + +/**Function************************************************************* + + Synopsis [Resizes the vector to the given capacity.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseVecGrow( Msat_ClauseVec_t * p, int nCapMin ) +{ + if ( p->nCap >= nCapMin ) + return; + p->pArray = REALLOC( Msat_Clause_t *, p->pArray, nCapMin ); + p->nCap = nCapMin; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseVecShrink( Msat_ClauseVec_t * p, int nSizeNew ) +{ + assert( p->nSize >= nSizeNew ); + p->nSize = nSizeNew; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseVecClear( Msat_ClauseVec_t * p ) +{ + p->nSize = 0; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseVecPush( Msat_ClauseVec_t * p, Msat_Clause_t * Entry ) +{ + if ( p->nSize == p->nCap ) + { + if ( p->nCap < 16 ) + Msat_ClauseVecGrow( p, 16 ); + else + Msat_ClauseVecGrow( p, 2 * p->nCap ); + } + p->pArray[p->nSize++] = Entry; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Clause_t * Msat_ClauseVecPop( Msat_ClauseVec_t * p ) +{ + return p->pArray[--p->nSize]; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_ClauseVecWriteEntry( Msat_ClauseVec_t * p, int i, Msat_Clause_t * Entry ) +{ + assert( i >= 0 && i < p->nSize ); + p->pArray[i] = Entry; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Clause_t * Msat_ClauseVecReadEntry( Msat_ClauseVec_t * p, int i ) +{ + assert( i >= 0 && i < p->nSize ); + return p->pArray[i]; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatInt.h b/src/sat/msat/msatInt.h new file mode 100644 index 00000000..03903abe --- /dev/null +++ b/src/sat/msat/msatInt.h @@ -0,0 +1,306 @@ +/**CFile**************************************************************** + + FileName [msatInt.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Internal definitions of the solver.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatInt.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#ifndef __MSAT_INT_H__ +#define __MSAT_INT_H__ + +//////////////////////////////////////////////////////////////////////// +/// INCLUDES /// +//////////////////////////////////////////////////////////////////////// + +//#include "leaks.h" +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> +#include <time.h> +#include <math.h> +#include "msat.h" + +//////////////////////////////////////////////////////////////////////// +/// PARAMETERS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// STRUCTURE DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +#ifdef _MSC_VER +typedef __int64 int64; +#else +typedef long long int64; +#endif + +// outputs the runtime in seconds +#define PRT(a,t) \ + printf( "%s = ", (a) ); printf( "%6.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC) ) + +// memory management macros +#define ALLOC(type, num) \ + ((type *) malloc(sizeof(type) * (num))) +#define REALLOC(type, obj, num) \ + ((obj) ? ((type *) realloc((char *)(obj), sizeof(type) * (num))) : \ + ((type *) malloc(sizeof(type) * (num)))) +#define FREE(obj) \ + ((obj) ? (free((char *)(obj)), (obj) = 0) : 0) + +// By default, custom memory management is used +// which guarantees constant time allocation/deallocation +// for SAT clauses and other frequently modified objects. +// For debugging, it is possible use system memory management +// directly. In which case, uncomment the macro below. +//#define USE_SYSTEM_MEMORY_MANAGEMENT + +// internal data structures +typedef struct Msat_Clause_t_ Msat_Clause_t; +typedef struct Msat_Queue_t_ Msat_Queue_t; +typedef struct Msat_Order_t_ Msat_Order_t; +// memory managers (duplicated from Extra for stand-aloneness) +typedef struct Msat_MmFixed_t_ Msat_MmFixed_t; +typedef struct Msat_MmFlex_t_ Msat_MmFlex_t; +typedef struct Msat_MmStep_t_ Msat_MmStep_t; +// variables and literals +typedef int Msat_Lit_t; +typedef int Msat_Var_t; +// the type of return value +#define MSAT_VAR_UNASSIGNED (-1) +#define MSAT_LIT_UNASSIGNED (-2) +#define MSAT_ORDER_UNKNOWN (-3) + +// printing the search tree +#define L_IND "%-*d" +#define L_ind Msat_SolverReadDecisionLevel(p)*3+3,Msat_SolverReadDecisionLevel(p) +#define L_LIT "%s%d" +#define L_lit(Lit) MSAT_LITSIGN(Lit)?"-":"", MSAT_LIT2VAR(Lit)+1 + +typedef struct Msat_SolverStats_t_ Msat_SolverStats_t; +struct Msat_SolverStats_t_ +{ + int64 nStarts; // the number of restarts + int64 nDecisions; // the number of decisions + int64 nPropagations; // the number of implications + int64 nInspects; // the number of times clauses are vising while watching them + int64 nConflicts; // the number of conflicts + int64 nSuccesses; // the number of sat assignments found +}; + +typedef struct Msat_SearchParams_t_ Msat_SearchParams_t; +struct Msat_SearchParams_t_ +{ + double dVarDecay; + double dClaDecay; +}; + +// sat solver data structure visible through all the internal files +struct Msat_Solver_t_ +{ + int nClauses; // the total number of clauses + int nClausesStart; // the number of clauses before adding + Msat_ClauseVec_t * vClauses; // problem clauses + Msat_ClauseVec_t * vLearned; // learned clauses + double dClaInc; // Amount to bump next clause with. + double dClaDecay; // INVERSE decay factor for clause activity: stores 1/decay. + + double * pdActivity; // A heuristic measurement of the activity of a variable. + float * pFactors; // the multiplicative factors of variable activity + double dVarInc; // Amount to bump next variable with. + double dVarDecay; // INVERSE decay factor for variable activity: stores 1/decay. Use negative value for static variable order. + Msat_Order_t * pOrder; // Keeps track of the decision variable order. + + Msat_ClauseVec_t ** pvWatched; // 'pvWatched[lit]' is a list of constraints watching 'lit' (will go there if literal becomes true). + Msat_Queue_t * pQueue; // Propagation queue. + + int nVars; // the current number of variables + int nVarsAlloc; // the maximum allowed number of variables + int * pAssigns; // The current assignments (literals or MSAT_VAR_UNKOWN) + int * pModel; // The satisfying assignment + Msat_IntVec_t * vTrail; // List of assignments made. + Msat_IntVec_t * vTrailLim; // Separator indices for different decision levels in 'trail'. + Msat_Clause_t ** pReasons; // 'reason[var]' is the clause that implied the variables current value, or 'NULL' if none. + int * pLevel; // 'level[var]' is the decision level at which assignment was made. + int nLevelRoot; // Level of first proper decision. + + double dRandSeed; // For the internal random number generator (makes solver deterministic over different platforms). + + bool fVerbose; // the verbosity flag + double dProgress; // Set by 'search()'. + + // the variable cone and variable connectivity + Msat_IntVec_t * vConeVars; + Msat_IntVec_t * vVarsUsed; + Msat_ClauseVec_t * vAdjacents; + + // internal data used during conflict analysis + int * pSeen; // time when a lit was seen for the last time + int nSeenId; // the id of current seeing + Msat_IntVec_t * vReason; // the temporary array of literals + Msat_IntVec_t * vTemp; // the temporary array of literals + int * pFreq; // the number of times each var participated in conflicts + + // the memory manager + Msat_MmStep_t * pMem; + + // statistics + Msat_SolverStats_t Stats; + int nTwoLits; + int nTwoLitsL; + int nClausesInit; + int nClausesAlloc; + int nClausesAllocL; + int nBackTracks; +}; + +struct Msat_ClauseVec_t_ +{ + Msat_Clause_t ** pArray; + int nSize; + int nCap; +}; + +struct Msat_IntVec_t_ +{ + int * pArray; + int nSize; + int nCap; +}; + +//////////////////////////////////////////////////////////////////////// +/// GLOBAL VARIABLES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// MACRO DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +/*=== satActivity.c ===========================================================*/ +extern void Msat_SolverVarDecayActivity( Msat_Solver_t * p ); +extern void Msat_SolverVarRescaleActivity( Msat_Solver_t * p ); +extern void Msat_SolverClaDecayActivity( Msat_Solver_t * p ); +extern void Msat_SolverClaRescaleActivity( Msat_Solver_t * p ); +/*=== satSolverApi.c ===========================================================*/ +extern Msat_Clause_t * Msat_SolverReadClause( Msat_Solver_t * p, int Num ); +/*=== satSolver.c ===========================================================*/ +extern int Msat_SolverReadDecisionLevel( Msat_Solver_t * p ); +extern int * Msat_SolverReadDecisionLevelArray( Msat_Solver_t * p ); +extern Msat_Clause_t ** Msat_SolverReadReasonArray( Msat_Solver_t * p ); +extern Msat_Type_t Msat_SolverReadVarValue( Msat_Solver_t * p, Msat_Var_t Var ); +extern Msat_ClauseVec_t * Msat_SolverReadLearned( Msat_Solver_t * p ); +extern Msat_ClauseVec_t ** Msat_SolverReadWatchedArray( Msat_Solver_t * p ); +extern int * Msat_SolverReadSeenArray( Msat_Solver_t * p ); +extern int Msat_SolverIncrementSeenId( Msat_Solver_t * p ); +extern Msat_MmStep_t * Msat_SolverReadMem( Msat_Solver_t * p ); +extern void Msat_SolverClausesIncrement( Msat_Solver_t * p ); +extern void Msat_SolverClausesDecrement( Msat_Solver_t * p ); +extern void Msat_SolverClausesIncrementL( Msat_Solver_t * p ); +extern void Msat_SolverClausesDecrementL( Msat_Solver_t * p ); +extern void Msat_SolverVarBumpActivity( Msat_Solver_t * p, Msat_Lit_t Lit ); +extern void Msat_SolverClaBumpActivity( Msat_Solver_t * p, Msat_Clause_t * pC ); +extern bool Msat_SolverEnqueue( Msat_Solver_t * p, Msat_Lit_t Lit, Msat_Clause_t * pC ); +extern double Msat_SolverProgressEstimate( Msat_Solver_t * p ); +/*=== satSolverSearch.c ===========================================================*/ +extern bool Msat_SolverAssume( Msat_Solver_t * p, Msat_Lit_t Lit ); +extern Msat_Clause_t * Msat_SolverPropagate( Msat_Solver_t * p ); +extern void Msat_SolverCancelUntil( Msat_Solver_t * p, int Level ); +extern Msat_Type_t Msat_SolverSearch( Msat_Solver_t * p, int nConfLimit, int nLearnedLimit, int nBackTrackLimit, Msat_SearchParams_t * pPars ); +/*=== satQueue.c ===========================================================*/ +extern Msat_Queue_t * Msat_QueueAlloc( int nVars ); +extern void Msat_QueueFree( Msat_Queue_t * p ); +extern int Msat_QueueReadSize( Msat_Queue_t * p ); +extern void Msat_QueueInsert( Msat_Queue_t * p, int Lit ); +extern int Msat_QueueExtract( Msat_Queue_t * p ); +extern void Msat_QueueClear( Msat_Queue_t * p ); +/*=== satOrder.c ===========================================================*/ +extern Msat_Order_t * Msat_OrderAlloc( Msat_Solver_t * pSat ); +extern void Msat_OrderSetBounds( Msat_Order_t * p, int nVarsMax ); +extern void Msat_OrderClean( Msat_Order_t * p, Msat_IntVec_t * vCone ); +extern int Msat_OrderCheck( Msat_Order_t * p ); +extern void Msat_OrderFree( Msat_Order_t * p ); +extern int Msat_OrderVarSelect( Msat_Order_t * p ); +extern void Msat_OrderVarAssigned( Msat_Order_t * p, int Var ); +extern void Msat_OrderVarUnassigned( Msat_Order_t * p, int Var ); +extern void Msat_OrderUpdate( Msat_Order_t * p, int Var ); +/*=== satClause.c ===========================================================*/ +extern bool Msat_ClauseCreate( Msat_Solver_t * p, Msat_IntVec_t * vLits, bool fLearnt, Msat_Clause_t ** pClause_out ); +extern Msat_Clause_t * Msat_ClauseCreateFake( Msat_Solver_t * p, Msat_IntVec_t * vLits ); +extern Msat_Clause_t * Msat_ClauseCreateFakeLit( Msat_Solver_t * p, Msat_Lit_t Lit ); +extern bool Msat_ClauseReadLearned( Msat_Clause_t * pC ); +extern int Msat_ClauseReadSize( Msat_Clause_t * pC ); +extern int * Msat_ClauseReadLits( Msat_Clause_t * pC ); +extern bool Msat_ClauseReadMark( Msat_Clause_t * pC ); +extern void Msat_ClauseSetMark( Msat_Clause_t * pC, bool fMark ); +extern int Msat_ClauseReadNum( Msat_Clause_t * pC ); +extern void Msat_ClauseSetNum( Msat_Clause_t * pC, int Num ); +extern bool Msat_ClauseReadTypeA( Msat_Clause_t * pC ); +extern void Msat_ClauseSetTypeA( Msat_Clause_t * pC, bool fTypeA ); +extern bool Msat_ClauseIsLocked( Msat_Solver_t * p, Msat_Clause_t * pC ); +extern float Msat_ClauseReadActivity( Msat_Clause_t * pC ); +extern void Msat_ClauseWriteActivity( Msat_Clause_t * pC, float Num ); +extern void Msat_ClauseFree( Msat_Solver_t * p, Msat_Clause_t * pC, bool fRemoveWatched ); +extern bool Msat_ClausePropagate( Msat_Clause_t * pC, Msat_Lit_t Lit, int * pAssigns, Msat_Lit_t * pLit_out ); +extern bool Msat_ClauseSimplify( Msat_Clause_t * pC, int * pAssigns ); +extern void Msat_ClauseCalcReason( Msat_Solver_t * p, Msat_Clause_t * pC, Msat_Lit_t Lit, Msat_IntVec_t * vLits_out ); +extern void Msat_ClauseRemoveWatch( Msat_ClauseVec_t * vClauses, Msat_Clause_t * pC ); +extern void Msat_ClausePrint( Msat_Clause_t * pC ); +extern void Msat_ClausePrintSymbols( Msat_Clause_t * pC ); +extern void Msat_ClauseWriteDimacs( FILE * pFile, Msat_Clause_t * pC, bool fIncrement ); +extern unsigned Msat_ClauseComputeTruth( Msat_Solver_t * p, Msat_Clause_t * pC ); +/*=== satSort.c ===========================================================*/ +extern void Msat_SolverSortDB( Msat_Solver_t * p ); +/*=== satClauseVec.c ===========================================================*/ +extern Msat_ClauseVec_t * Msat_ClauseVecAlloc( int nCap ); +extern void Msat_ClauseVecFree( Msat_ClauseVec_t * p ); +extern Msat_Clause_t ** Msat_ClauseVecReadArray( Msat_ClauseVec_t * p ); +extern int Msat_ClauseVecReadSize( Msat_ClauseVec_t * p ); +extern void Msat_ClauseVecGrow( Msat_ClauseVec_t * p, int nCapMin ); +extern void Msat_ClauseVecShrink( Msat_ClauseVec_t * p, int nSizeNew ); +extern void Msat_ClauseVecClear( Msat_ClauseVec_t * p ); +extern void Msat_ClauseVecPush( Msat_ClauseVec_t * p, Msat_Clause_t * Entry ); +extern Msat_Clause_t * Msat_ClauseVecPop( Msat_ClauseVec_t * p ); +extern void Msat_ClauseVecWriteEntry( Msat_ClauseVec_t * p, int i, Msat_Clause_t * Entry ); +extern Msat_Clause_t * Msat_ClauseVecReadEntry( Msat_ClauseVec_t * p, int i ); + +/*=== satMem.c ===========================================================*/ +// fixed-size-block memory manager +extern Msat_MmFixed_t * Msat_MmFixedStart( int nEntrySize ); +extern void Msat_MmFixedStop( Msat_MmFixed_t * p, int fVerbose ); +extern char * Msat_MmFixedEntryFetch( Msat_MmFixed_t * p ); +extern void Msat_MmFixedEntryRecycle( Msat_MmFixed_t * p, char * pEntry ); +extern void Msat_MmFixedRestart( Msat_MmFixed_t * p ); +extern int Msat_MmFixedReadMemUsage( Msat_MmFixed_t * p ); +// flexible-size-block memory manager +extern Msat_MmFlex_t * Msat_MmFlexStart(); +extern void Msat_MmFlexStop( Msat_MmFlex_t * p, int fVerbose ); +extern char * Msat_MmFlexEntryFetch( Msat_MmFlex_t * p, int nBytes ); +extern int Msat_MmFlexReadMemUsage( Msat_MmFlex_t * p ); +// hierarchical memory manager +extern Msat_MmStep_t * Msat_MmStepStart( int nSteps ); +extern void Msat_MmStepStop( Msat_MmStep_t * p, int fVerbose ); +extern char * Msat_MmStepEntryFetch( Msat_MmStep_t * p, int nBytes ); +extern void Msat_MmStepEntryRecycle( Msat_MmStep_t * p, char * pEntry, int nBytes ); +extern int Msat_MmStepReadMemUsage( Msat_MmStep_t * p ); + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// +#endif diff --git a/src/sat/msat/msatMem.c b/src/sat/msat/msatMem.c new file mode 100644 index 00000000..30bf4a96 --- /dev/null +++ b/src/sat/msat/msatMem.c @@ -0,0 +1,529 @@ +/**CFile**************************************************************** + + FileName [msatMem.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Memory managers borrowed from Extra.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatMem.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +struct Msat_MmFixed_t_ +{ + // information about individual entries + int nEntrySize; // the size of one entry + int nEntriesAlloc; // the total number of entries allocated + int nEntriesUsed; // the number of entries in use + int nEntriesMax; // the max number of entries in use + char * pEntriesFree; // the linked list of free entries + + // this is where the memory is stored + int nChunkSize; // the size of one chunk + int nChunksAlloc; // the maximum number of memory chunks + int nChunks; // the current number of memory chunks + char ** pChunks; // the allocated memory + + // statistics + int nMemoryUsed; // memory used in the allocated entries + int nMemoryAlloc; // memory allocated +}; + +struct Msat_MmFlex_t_ +{ + // information about individual entries + int nEntriesUsed; // the number of entries allocated + char * pCurrent; // the current pointer to free memory + char * pEnd; // the first entry outside the free memory + + // this is where the memory is stored + int nChunkSize; // the size of one chunk + int nChunksAlloc; // the maximum number of memory chunks + int nChunks; // the current number of memory chunks + char ** pChunks; // the allocated memory + + // statistics + int nMemoryUsed; // memory used in the allocated entries + int nMemoryAlloc; // memory allocated +}; + + +struct Msat_MmStep_t_ +{ + int nMems; // the number of fixed memory managers employed + Msat_MmFixed_t ** pMems; // memory managers: 2^1 words, 2^2 words, etc + int nMapSize; // the size of the memory array + Msat_MmFixed_t ** pMap; // maps the number of bytes into its memory manager +}; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates memory pieces of fixed size.] + + Description [The size of the chunk is computed as the minimum of + 1024 entries and 64K. Can only work with entry size at least 4 byte long.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_MmFixed_t * Msat_MmFixedStart( int nEntrySize ) +{ + Msat_MmFixed_t * p; + + p = ALLOC( Msat_MmFixed_t, 1 ); + memset( p, 0, sizeof(Msat_MmFixed_t) ); + + p->nEntrySize = nEntrySize; + p->nEntriesAlloc = 0; + p->nEntriesUsed = 0; + p->pEntriesFree = NULL; + + if ( nEntrySize * (1 << 10) < (1<<16) ) + p->nChunkSize = (1 << 10); + else + p->nChunkSize = (1<<16) / nEntrySize; + if ( p->nChunkSize < 8 ) + p->nChunkSize = 8; + + p->nChunksAlloc = 64; + p->nChunks = 0; + p->pChunks = ALLOC( char *, p->nChunksAlloc ); + + p->nMemoryUsed = 0; + p->nMemoryAlloc = 0; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmFixedStop( Msat_MmFixed_t * p, int fVerbose ) +{ + int i; + if ( p == NULL ) + return; + if ( fVerbose ) + { + printf( "Fixed memory manager: Entry = %5d. Chunk = %5d. Chunks used = %5d.\n", + p->nEntrySize, p->nChunkSize, p->nChunks ); + printf( " Entries used = %8d. Entries peak = %8d. Memory used = %8d. Memory alloc = %8d.\n", + p->nEntriesUsed, p->nEntriesMax, p->nEntrySize * p->nEntriesUsed, p->nMemoryAlloc ); + } + for ( i = 0; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + free( p->pChunks ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Msat_MmFixedEntryFetch( Msat_MmFixed_t * p ) +{ + char * pTemp; + int i; + + // check if there are still free entries + if ( p->nEntriesUsed == p->nEntriesAlloc ) + { // need to allocate more entries + assert( p->pEntriesFree == NULL ); + if ( p->nChunks == p->nChunksAlloc ) + { + p->nChunksAlloc *= 2; + p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); + } + p->pEntriesFree = ALLOC( char, p->nEntrySize * p->nChunkSize ); + p->nMemoryAlloc += p->nEntrySize * p->nChunkSize; + // transform these entries into a linked list + pTemp = p->pEntriesFree; + for ( i = 1; i < p->nChunkSize; i++ ) + { + *((char **)pTemp) = pTemp + p->nEntrySize; + pTemp += p->nEntrySize; + } + // set the last link + *((char **)pTemp) = NULL; + // add the chunk to the chunk storage + p->pChunks[ p->nChunks++ ] = p->pEntriesFree; + // add to the number of entries allocated + p->nEntriesAlloc += p->nChunkSize; + } + // incrememt the counter of used entries + p->nEntriesUsed++; + if ( p->nEntriesMax < p->nEntriesUsed ) + p->nEntriesMax = p->nEntriesUsed; + // return the first entry in the free entry list + pTemp = p->pEntriesFree; + p->pEntriesFree = *((char **)pTemp); + return pTemp; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmFixedEntryRecycle( Msat_MmFixed_t * p, char * pEntry ) +{ + // decrement the counter of used entries + p->nEntriesUsed--; + // add the entry to the linked list of free entries + *((char **)pEntry) = p->pEntriesFree; + p->pEntriesFree = pEntry; +} + +/**Function************************************************************* + + Synopsis [] + + Description [Relocates all the memory except the first chunk.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmFixedRestart( Msat_MmFixed_t * p ) +{ + int i; + char * pTemp; + + // deallocate all chunks except the first one + for ( i = 1; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + p->nChunks = 1; + // transform these entries into a linked list + pTemp = p->pChunks[0]; + for ( i = 1; i < p->nChunkSize; i++ ) + { + *((char **)pTemp) = pTemp + p->nEntrySize; + pTemp += p->nEntrySize; + } + // set the last link + *((char **)pTemp) = NULL; + // set the free entry list + p->pEntriesFree = p->pChunks[0]; + // set the correct statistics + p->nMemoryAlloc = p->nEntrySize * p->nChunkSize; + p->nMemoryUsed = 0; + p->nEntriesAlloc = p->nChunkSize; + p->nEntriesUsed = 0; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_MmFixedReadMemUsage( Msat_MmFixed_t * p ) +{ + return p->nMemoryAlloc; +} + + + +/**Function************************************************************* + + Synopsis [Allocates entries of flexible size.] + + Description [Can only work with entry size at least 4 byte long.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_MmFlex_t * Msat_MmFlexStart() +{ + Msat_MmFlex_t * p; + + p = ALLOC( Msat_MmFlex_t, 1 ); + memset( p, 0, sizeof(Msat_MmFlex_t) ); + + p->nEntriesUsed = 0; + p->pCurrent = NULL; + p->pEnd = NULL; + + p->nChunkSize = (1 << 12); + p->nChunksAlloc = 64; + p->nChunks = 0; + p->pChunks = ALLOC( char *, p->nChunksAlloc ); + + p->nMemoryUsed = 0; + p->nMemoryAlloc = 0; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmFlexStop( Msat_MmFlex_t * p, int fVerbose ) +{ + int i; + if ( p == NULL ) + return; + if ( fVerbose ) + { + printf( "Flexible memory manager: Chunk size = %d. Chunks used = %d.\n", + p->nChunkSize, p->nChunks ); + printf( " Entries used = %d. Memory used = %d. Memory alloc = %d.\n", + p->nEntriesUsed, p->nMemoryUsed, p->nMemoryAlloc ); + } + for ( i = 0; i < p->nChunks; i++ ) + free( p->pChunks[i] ); + free( p->pChunks ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Msat_MmFlexEntryFetch( Msat_MmFlex_t * p, int nBytes ) +{ + char * pTemp; + // check if there are still free entries + if ( p->pCurrent == NULL || p->pCurrent + nBytes > p->pEnd ) + { // need to allocate more entries + if ( p->nChunks == p->nChunksAlloc ) + { + p->nChunksAlloc *= 2; + p->pChunks = REALLOC( char *, p->pChunks, p->nChunksAlloc ); + } + if ( nBytes > p->nChunkSize ) + { + // resize the chunk size if more memory is requested than it can give + // (ideally, this should never happen) + p->nChunkSize = 2 * nBytes; + } + p->pCurrent = ALLOC( char, p->nChunkSize ); + p->pEnd = p->pCurrent + p->nChunkSize; + p->nMemoryAlloc += p->nChunkSize; + // add the chunk to the chunk storage + p->pChunks[ p->nChunks++ ] = p->pCurrent; + } + assert( p->pCurrent + nBytes <= p->pEnd ); + // increment the counter of used entries + p->nEntriesUsed++; + // keep track of the memory used + p->nMemoryUsed += nBytes; + // return the next entry + pTemp = p->pCurrent; + p->pCurrent += nBytes; + return pTemp; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_MmFlexReadMemUsage( Msat_MmFlex_t * p ) +{ + return p->nMemoryAlloc; +} + + + + + +/**Function************************************************************* + + Synopsis [Starts the hierarchical memory manager.] + + Description [This manager can allocate entries of any size. + Iternally they are mapped into the entries with the number of bytes + equal to the power of 2. The smallest entry size is 8 bytes. The + next one is 16 bytes etc. So, if the user requests 6 bytes, he gets + 8 byte entry. If we asks for 25 bytes, he gets 32 byte entry etc. + The input parameters "nSteps" says how many fixed memory managers + are employed internally. Calling this procedure with nSteps equal + to 10 results in 10 hierarchically arranged internal memory managers, + which can allocate up to 4096 (1Kb) entries. Requests for larger + entries are handed over to malloc() and then free()ed.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_MmStep_t * Msat_MmStepStart( int nSteps ) +{ + Msat_MmStep_t * p; + int i, k; + p = ALLOC( Msat_MmStep_t, 1 ); + p->nMems = nSteps; + // start the fixed memory managers + p->pMems = ALLOC( Msat_MmFixed_t *, p->nMems ); + for ( i = 0; i < p->nMems; i++ ) + p->pMems[i] = Msat_MmFixedStart( (8<<i) ); + // set up the mapping of the required memory size into the corresponding manager + p->nMapSize = (4<<p->nMems); + p->pMap = ALLOC( Msat_MmFixed_t *, p->nMapSize+1 ); + p->pMap[0] = NULL; + for ( k = 1; k <= 4; k++ ) + p->pMap[k] = p->pMems[0]; + for ( i = 0; i < p->nMems; i++ ) + for ( k = (4<<i)+1; k <= (8<<i); k++ ) + p->pMap[k] = p->pMems[i]; +//for ( i = 1; i < 100; i ++ ) +//printf( "%10d: size = %10d\n", i, p->pMap[i]->nEntrySize ); + return p; +} + +/**Function************************************************************* + + Synopsis [Stops the memory manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmStepStop( Msat_MmStep_t * p, int fVerbose ) +{ + int i; + for ( i = 0; i < p->nMems; i++ ) + Msat_MmFixedStop( p->pMems[i], fVerbose ); + free( p->pMems ); + free( p->pMap ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Creates the entry.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Msat_MmStepEntryFetch( Msat_MmStep_t * p, int nBytes ) +{ + if ( nBytes == 0 ) + return NULL; + if ( nBytes > p->nMapSize ) + { +// printf( "Allocating %d bytes.\n", nBytes ); + return ALLOC( char, nBytes ); + } + return Msat_MmFixedEntryFetch( p->pMap[nBytes] ); +} + + +/**Function************************************************************* + + Synopsis [Recycles the entry.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_MmStepEntryRecycle( Msat_MmStep_t * p, char * pEntry, int nBytes ) +{ + if ( nBytes == 0 ) + return; + if ( nBytes > p->nMapSize ) + { + free( pEntry ); + return; + } + Msat_MmFixedEntryRecycle( p->pMap[nBytes], pEntry ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_MmStepReadMemUsage( Msat_MmStep_t * p ) +{ + int i, nMemTotal = 0; + for ( i = 0; i < p->nMems; i++ ) + nMemTotal += p->pMems[i]->nMemoryAlloc; + return nMemTotal; +} diff --git a/src/sat/msat/msatOrderH.c b/src/sat/msat/msatOrderH.c new file mode 100644 index 00000000..956e7fc6 --- /dev/null +++ b/src/sat/msat/msatOrderH.c @@ -0,0 +1,405 @@ +/**CFile**************************************************************** + + FileName [msatOrder.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [The manager of variable assignment.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatOrder.c,v 1.0 2005/05/30 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +// the variable package data structure +struct Msat_Order_t_ +{ + Msat_Solver_t * pSat; // the SAT solver + Msat_IntVec_t * vIndex; // the heap + Msat_IntVec_t * vHeap; // the mapping of var num into its heap num +}; + +//The solver can communicate to the variable order the following parts: +//- the array of current assignments (pSat->pAssigns) +//- the array of variable activities (pSat->pdActivity) +//- the array of variables currently in the cone (pSat->vConeVars) +//- the array of arrays of variables adjucent to each(pSat->vAdjacents) + +#define HLEFT(i) ((i)<<1) +#define HRIGHT(i) (((i)<<1)+1) +#define HPARENT(i) ((i)>>1) +#define HCOMPARE(p, i, j) ((p)->pSat->pdActivity[i] > (p)->pSat->pdActivity[j]) +#define HHEAP(p, i) ((p)->vHeap->pArray[i]) +#define HSIZE(p) ((p)->vHeap->nSize) +#define HOKAY(p, i) ((i) >= 0 && (i) < (p)->vIndex->nSize) +#define HINHEAP(p, i) (HOKAY(p, i) && (p)->vIndex->pArray[i] != 0) +#define HEMPTY(p) (HSIZE(p) == 1) + +static int Msat_HeapCheck_rec( Msat_Order_t * p, int i ); +static int Msat_HeapGetTop( Msat_Order_t * p ); +static void Msat_HeapInsert( Msat_Order_t * p, int n ); +static void Msat_HeapIncrease( Msat_Order_t * p, int n ); +static void Msat_HeapPercolateUp( Msat_Order_t * p, int i ); +static void Msat_HeapPercolateDown( Msat_Order_t * p, int i ); + +extern int timeSelect; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates the ordering structure.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Order_t * Msat_OrderAlloc( Msat_Solver_t * pSat ) +{ + Msat_Order_t * p; + p = ALLOC( Msat_Order_t, 1 ); + memset( p, 0, sizeof(Msat_Order_t) ); + p->pSat = pSat; + p->vIndex = Msat_IntVecAlloc( 0 ); + p->vHeap = Msat_IntVecAlloc( 0 ); + Msat_OrderSetBounds( p, pSat->nVarsAlloc ); + return p; +} + +/**Function************************************************************* + + Synopsis [Sets the bound of the ordering structure.] + + Description [Should be called whenever the SAT solver is resized.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderSetBounds( Msat_Order_t * p, int nVarsMax ) +{ + Msat_IntVecGrow( p->vIndex, nVarsMax ); + Msat_IntVecGrow( p->vHeap, nVarsMax + 1 ); + p->vIndex->nSize = nVarsMax; + p->vHeap->nSize = 0; +} + +/**Function************************************************************* + + Synopsis [Cleans the ordering structure.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderClean( Msat_Order_t * p, Msat_IntVec_t * vCone ) +{ + int i; + for ( i = 0; i < p->vIndex->nSize; i++ ) + p->vIndex->pArray[i] = 0; + for ( i = 0; i < vCone->nSize; i++ ) + { + assert( i+1 < p->vHeap->nCap ); + p->vHeap->pArray[i+1] = vCone->pArray[i]; + + assert( vCone->pArray[i] < p->vIndex->nSize ); + p->vIndex->pArray[vCone->pArray[i]] = i+1; + } + p->vHeap->nSize = vCone->nSize + 1; +} + +/**Function************************************************************* + + Synopsis [Checks that the J-boundary is okay.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_OrderCheck( Msat_Order_t * p ) +{ + return Msat_HeapCheck_rec( p, 1 ); +} + +/**Function************************************************************* + + Synopsis [Frees the ordering structure.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderFree( Msat_Order_t * p ) +{ + Msat_IntVecFree( p->vHeap ); + Msat_IntVecFree( p->vIndex ); + free( p ); +} + + + +/**Function************************************************************* + + Synopsis [Selects the next variable to assign.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_OrderVarSelect( Msat_Order_t * p ) +{ + // Activity based decision: +// while (!heap.empty()){ +// Var next = heap.getmin(); +// if (toLbool(assigns[next]) == l_Undef) +// return next; +// } +// return var_Undef; + + int Var; + int clk = clock(); + + while ( !HEMPTY(p) ) + { + Var = Msat_HeapGetTop(p); + if ( (p)->pSat->pAssigns[Var] == MSAT_VAR_UNASSIGNED ) + { +//assert( Msat_OrderCheck(p) ); +timeSelect += clock() - clk; + return Var; + } + } + return MSAT_ORDER_UNKNOWN; +} + +/**Function************************************************************* + + Synopsis [Updates J-boundary when the variable is assigned.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderVarAssigned( Msat_Order_t * p, int Var ) +{ +} + +/**Function************************************************************* + + Synopsis [Updates the order after a variable is unassigned.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderVarUnassigned( Msat_Order_t * p, int Var ) +{ +// if (!heap.inHeap(x)) +// heap.insert(x); + + int clk = clock(); + if ( !HINHEAP(p,Var) ) + Msat_HeapInsert( p, Var ); +timeSelect += clock() - clk; +} + +/**Function************************************************************* + + Synopsis [Updates the order after a variable changed weight.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderUpdate( Msat_Order_t * p, int Var ) +{ +// if (heap.inHeap(x)) +// heap.increase(x); + + int clk = clock(); + if ( HINHEAP(p,Var) ) + Msat_HeapIncrease( p, Var ); +timeSelect += clock() - clk; +} + + + + +/**Function************************************************************* + + Synopsis [Checks the heap property recursively.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_HeapCheck_rec( Msat_Order_t * p, int i ) +{ + return i >= HSIZE(p) || + ( HPARENT(i) == 0 || !HCOMPARE(p, HHEAP(p, i), HHEAP(p, HPARENT(i))) ) && + Msat_HeapCheck_rec( p, HLEFT(i) ) && Msat_HeapCheck_rec( p, HRIGHT(i) ); +} + +/**Function************************************************************* + + Synopsis [Retrieves the minimum element.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_HeapGetTop( Msat_Order_t * p ) +{ + int Result, NewTop; + Result = HHEAP(p, 1); + NewTop = Msat_IntVecPop( p->vHeap ); + p->vHeap->pArray[1] = NewTop; + p->vIndex->pArray[NewTop] = 1; + p->vIndex->pArray[Result] = 0; + if ( p->vHeap->nSize > 1 ) + Msat_HeapPercolateDown( p, 1 ); + return Result; +} + +/**Function************************************************************* + + Synopsis [Inserts the new element.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_HeapInsert( Msat_Order_t * p, int n ) +{ + assert( HOKAY(p, n) ); + p->vIndex->pArray[n] = HSIZE(p); + Msat_IntVecPush( p->vHeap, n ); + Msat_HeapPercolateUp( p, p->vIndex->pArray[n] ); +} + +/**Function************************************************************* + + Synopsis [Inserts the new element.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_HeapIncrease( Msat_Order_t * p, int n ) +{ + Msat_HeapPercolateUp( p, p->vIndex->pArray[n] ); +} + +/**Function************************************************************* + + Synopsis [Moves the entry up.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_HeapPercolateUp( Msat_Order_t * p, int i ) +{ + int x = HHEAP(p, i); + while ( HPARENT(i) != 0 && HCOMPARE(p, x, HHEAP(p, HPARENT(i))) ) + { + p->vHeap->pArray[i] = HHEAP(p, HPARENT(i)); + p->vIndex->pArray[HHEAP(p, i)] = i; + i = HPARENT(i); + } + p->vHeap->pArray[i] = x; + p->vIndex->pArray[x] = i; +} + +/**Function************************************************************* + + Synopsis [Moves the entry down.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_HeapPercolateDown( Msat_Order_t * p, int i ) +{ + int x = HHEAP(p, i); + int Child; + while ( HLEFT(i) < HSIZE(p) ) + { + if ( HRIGHT(i) < HSIZE(p) && HCOMPARE(p, HHEAP(p, HRIGHT(i)), HHEAP(p, HLEFT(i))) ) + Child = HRIGHT(i); + else + Child = HLEFT(i); + if ( !HCOMPARE(p, HHEAP(p, Child), x) ) + break; + p->vHeap->pArray[i] = HHEAP(p, Child); + p->vIndex->pArray[HHEAP(p, i)] = i; + i = Child; + } + p->vHeap->pArray[i] = x; + p->vIndex->pArray[x] = i; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatOrderJ.c b/src/sat/msat/msatOrderJ.c new file mode 100644 index 00000000..4db7ff7b --- /dev/null +++ b/src/sat/msat/msatOrderJ.c @@ -0,0 +1,472 @@ +/**CFile**************************************************************** + + FileName [msatOrder.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [The manager of variable assignment.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatOrder.c,v 1.0 2005/05/30 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +/* +The J-boundary (justification boundary) is defined as a set of unassigned +variables belonging to the cone of interest, such that for each of them, +there exist an adjacent assigned variable in the cone of interest. +*/ + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +typedef struct Msat_OrderVar_t_ Msat_OrderVar_t; +typedef struct Msat_OrderRing_t_ Msat_OrderRing_t; + +// the variable data structure +struct Msat_OrderVar_t_ +{ + Msat_OrderVar_t * pNext; + Msat_OrderVar_t * pPrev; + int Num; +}; + +// the ring of variables data structure (J-boundary) +struct Msat_OrderRing_t_ +{ + Msat_OrderVar_t * pRoot; + int nItems; +}; + +// the variable package data structure +struct Msat_Order_t_ +{ + Msat_Solver_t * pSat; // the SAT solver + Msat_OrderVar_t * pVars; // the storage for variables + int nVarsAlloc; // the number of variables allocated + Msat_OrderRing_t rVars; // the J-boundary as a ring of variables +}; + +//The solver can communicate to the variable order the following parts: +//- the array of current assignments (pSat->pAssigns) +//- the array of variable activities (pSat->pdActivity) +//- the array of variables currently in the cone (pSat->vConeVars) +//- the array of arrays of variables adjucent to each(pSat->vAdjacents) + +#define Msat_OrderVarIsInBoundary( p, i ) ((p)->pVars[i].pNext) +#define Msat_OrderVarIsAssigned( p, i ) ((p)->pSat->pAssigns[i] != MSAT_VAR_UNASSIGNED) +#define Msat_OrderVarIsUsedInCone( p, i ) ((p)->pSat->vVarsUsed->pArray[i]) + +// iterator through the entries in J-boundary +#define Msat_OrderRingForEachEntry( pRing, pVar, pNext ) \ + for ( pVar = pRing, \ + pNext = pVar? pVar->pNext : NULL; \ + pVar; \ + pVar = (pNext != pRing)? pNext : NULL, \ + pNext = pVar? pVar->pNext : NULL ) + +static void Msat_OrderRingAddLast( Msat_OrderRing_t * pRing, Msat_OrderVar_t * pVar ); +static void Msat_OrderRingRemove( Msat_OrderRing_t * pRing, Msat_OrderVar_t * pVar ); + +extern int timeSelect; +extern int timeAssign; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates the ordering structure.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Order_t * Msat_OrderAlloc( Msat_Solver_t * pSat ) +{ + Msat_Order_t * p; + p = ALLOC( Msat_Order_t, 1 ); + memset( p, 0, sizeof(Msat_Order_t) ); + p->pSat = pSat; + Msat_OrderSetBounds( p, pSat->nVarsAlloc ); + return p; +} + +/**Function************************************************************* + + Synopsis [Sets the bound of the ordering structure.] + + Description [Should be called whenever the SAT solver is resized.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderSetBounds( Msat_Order_t * p, int nVarsMax ) +{ + int i; + // add variables if they are missing + if ( p->nVarsAlloc < nVarsMax ) + { + p->pVars = REALLOC( Msat_OrderVar_t, p->pVars, nVarsMax ); + for ( i = p->nVarsAlloc; i < nVarsMax; i++ ) + { + p->pVars[i].pNext = p->pVars[i].pPrev = NULL; + p->pVars[i].Num = i; + } + p->nVarsAlloc = nVarsMax; + } +} + +/**Function************************************************************* + + Synopsis [Cleans the ordering structure.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderClean( Msat_Order_t * p, Msat_IntVec_t * vCone ) +{ + Msat_OrderVar_t * pVar, * pNext; + // quickly undo the ring + Msat_OrderRingForEachEntry( p->rVars.pRoot, pVar, pNext ) + pVar->pNext = pVar->pPrev = NULL; + p->rVars.pRoot = NULL; + p->rVars.nItems = 0; +} + +/**Function************************************************************* + + Synopsis [Checks that the J-boundary is okay.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_OrderCheck( Msat_Order_t * p ) +{ + Msat_OrderVar_t * pVar, * pNext; + Msat_IntVec_t * vRound; + int * pRound, nRound; + int * pVars, nVars, i, k; + int Counter = 0; + + // go through all the variables in the boundary + Msat_OrderRingForEachEntry( p->rVars.pRoot, pVar, pNext ) + { + assert( !Msat_OrderVarIsAssigned(p, pVar->Num) ); + // go though all the variables in the neighborhood + // and check that it is true that there is least one assigned + vRound = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( p->pSat->vAdjacents, pVar->Num ); + nRound = Msat_IntVecReadSize( vRound ); + pRound = Msat_IntVecReadArray( vRound ); + for ( i = 0; i < nRound; i++ ) + { + if ( !Msat_OrderVarIsUsedInCone(p, pRound[i]) ) + continue; + if ( Msat_OrderVarIsAssigned(p, pRound[i]) ) + break; + } +// assert( i != nRound ); +// if ( i == nRound ) +// return 0; + if ( i == nRound ) + Counter++; + } + if ( Counter > 0 ) + printf( "%d(%d) ", Counter, p->rVars.nItems ); + + // we may also check other unassigned variables in the cone + // to make sure that if they are not in J-boundary, + // then they do not have an assigned neighbor + nVars = Msat_IntVecReadSize( p->pSat->vConeVars ); + pVars = Msat_IntVecReadArray( p->pSat->vConeVars ); + for ( i = 0; i < nVars; i++ ) + { + assert( Msat_OrderVarIsUsedInCone(p, pVars[i]) ); + // skip assigned vars, vars in the boundary, and vars not used in the cone + if ( Msat_OrderVarIsAssigned(p, pVars[i]) || + Msat_OrderVarIsInBoundary(p, pVars[i]) ) + continue; + // make sure, it does not have assigned neighbors + vRound = (Msat_IntVec_t *)Msat_ClauseVecReadEntry( p->pSat->vAdjacents, pVars[i] ); + nRound = Msat_IntVecReadSize( vRound ); + pRound = Msat_IntVecReadArray( vRound ); + for ( k = 0; k < nRound; k++ ) + { + if ( !Msat_OrderVarIsUsedInCone(p, pRound[k]) ) + continue; + if ( Msat_OrderVarIsAssigned(p, pRound[k]) ) + break; + } +// assert( k == nRound ); +// if ( k != nRound ) +// return 0; + } + return 1; +} + +/**Function************************************************************* + + Synopsis [Frees the ordering structure.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderFree( Msat_Order_t * p ) +{ + free( p->pVars ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Selects the next variable to assign.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_OrderVarSelect( Msat_Order_t * p ) +{ + Msat_OrderVar_t * pVar, * pNext, * pVarBest; + double * pdActs = p->pSat->pdActivity; + double dfActBest; +// int clk = clock(); + + pVarBest = NULL; + dfActBest = -1.0; + Msat_OrderRingForEachEntry( p->rVars.pRoot, pVar, pNext ) + { + if ( dfActBest < pdActs[pVar->Num] ) + { + dfActBest = pdActs[pVar->Num]; + pVarBest = pVar; + } + } +//timeSelect += clock() - clk; +//timeAssign += clock() - clk; + +//if ( pVarBest && pVarBest->Num % 1000 == 0 ) +//printf( "%d ", p->rVars.nItems ); + +// Msat_OrderCheck( p ); + if ( pVarBest ) + { + assert( Msat_OrderVarIsUsedInCone(p, pVarBest->Num) ); + return pVarBest->Num; + } + return MSAT_ORDER_UNKNOWN; +} + +/**Function************************************************************* + + Synopsis [Updates J-boundary when the variable is assigned.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderVarAssigned( Msat_Order_t * p, int Var ) +{ + Msat_IntVec_t * vRound; + int i;//, clk = clock(); + + // make sure the variable is in the boundary + assert( Var < p->nVarsAlloc ); + // if it is not in the boundary (initial decision, random decision), do not remove + if ( Msat_OrderVarIsInBoundary( p, Var ) ) + Msat_OrderRingRemove( &p->rVars, &p->pVars[Var] ); + // add to the boundary those neighbors that are (1) unassigned, (2) not in boundary + // because for them we know that there is a variable (Var) which is assigned + vRound = (Msat_IntVec_t *)p->pSat->vAdjacents->pArray[Var]; + for ( i = 0; i < vRound->nSize; i++ ) + { + if ( !Msat_OrderVarIsUsedInCone(p, vRound->pArray[i]) ) + continue; + if ( Msat_OrderVarIsAssigned(p, vRound->pArray[i]) ) + continue; + if ( Msat_OrderVarIsInBoundary(p, vRound->pArray[i]) ) + continue; + Msat_OrderRingAddLast( &p->rVars, &p->pVars[vRound->pArray[i]] ); + } +//timeSelect += clock() - clk; +// Msat_OrderCheck( p ); +} + +/**Function************************************************************* + + Synopsis [Updates the order after a variable is unassigned.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderVarUnassigned( Msat_Order_t * p, int Var ) +{ + Msat_IntVec_t * vRound, * vRound2; + int i, k;//, clk = clock(); + + // make sure the variable is not in the boundary + assert( Var < p->nVarsAlloc ); + assert( !Msat_OrderVarIsInBoundary( p, Var ) ); + // go through its neigbors - if one of them is assigned add this var + // add to the boundary those neighbors that are not there already + // this will also get rid of variable outside of the current cone + // because they are unassigned in Msat_SolverPrepare() + vRound = (Msat_IntVec_t *)p->pSat->vAdjacents->pArray[Var]; + for ( i = 0; i < vRound->nSize; i++ ) + if ( Msat_OrderVarIsAssigned(p, vRound->pArray[i]) ) + break; + if ( i != vRound->nSize ) + Msat_OrderRingAddLast( &p->rVars, &p->pVars[Var] ); + + // unassigning a variable may lead to its adjacents dropping from the boundary + for ( i = 0; i < vRound->nSize; i++ ) + if ( Msat_OrderVarIsInBoundary(p, vRound->pArray[i]) ) + { // the neighbor is in the J-boundary (and unassigned) + assert( !Msat_OrderVarIsAssigned(p, vRound->pArray[i]) ); + vRound2 = (Msat_IntVec_t *)p->pSat->vAdjacents->pArray[vRound->pArray[i]]; + // go through its neighbors and determine if there is at least one assigned + for ( k = 0; k < vRound2->nSize; k++ ) + if ( Msat_OrderVarIsAssigned(p, vRound2->pArray[k]) ) + break; + if ( k == vRound2->nSize ) // there is no assigned vars, delete this one + Msat_OrderRingRemove( &p->rVars, &p->pVars[vRound->pArray[i]] ); + } +//timeSelect += clock() - clk; +// Msat_OrderCheck( p ); +} + +/**Function************************************************************* + + Synopsis [Updates the order after a variable changed weight.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderUpdate( Msat_Order_t * p, int Var ) +{ +} + + +/**Function************************************************************* + + Synopsis [Adds node to the end of the ring.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderRingAddLast( Msat_OrderRing_t * pRing, Msat_OrderVar_t * pVar ) +{ +//printf( "adding %d\n", pVar->Num ); + // check that the node is not in a ring + assert( pVar->pPrev == NULL ); + assert( pVar->pNext == NULL ); + // if the ring is empty, make the node point to itself + pRing->nItems++; + if ( pRing->pRoot == NULL ) + { + pRing->pRoot = pVar; + pVar->pPrev = pVar; + pVar->pNext = pVar; + return; + } + // if the ring is not empty, add it as the last entry + pVar->pPrev = pRing->pRoot->pPrev; + pVar->pNext = pRing->pRoot; + pVar->pPrev->pNext = pVar; + pVar->pNext->pPrev = pVar; + + // move the root so that it points to the new entry +// pRing->pRoot = pRing->pRoot->pPrev; +} + +/**Function************************************************************* + + Synopsis [Removes the node from the ring.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_OrderRingRemove( Msat_OrderRing_t * pRing, Msat_OrderVar_t * pVar ) +{ +//printf( "removing %d\n", pVar->Num ); + // check that the var is in a ring + assert( pVar->pPrev ); + assert( pVar->pNext ); + pRing->nItems--; + if ( pRing->nItems == 0 ) + { + assert( pRing->pRoot == pVar ); + pVar->pPrev = NULL; + pVar->pNext = NULL; + pRing->pRoot = NULL; + return; + } + // move the root if needed + if ( pRing->pRoot == pVar ) + pRing->pRoot = pVar->pNext; + // move the root to the next entry after pVar + // this way all the additions to the list will be traversed first +// pRing->pRoot = pVar->pPrev; + // delete the node + pVar->pPrev->pNext = pVar->pNext; + pVar->pNext->pPrev = pVar->pPrev; + pVar->pPrev = NULL; + pVar->pNext = NULL; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatQueue.c b/src/sat/msat/msatQueue.c new file mode 100644 index 00000000..5938e042 --- /dev/null +++ b/src/sat/msat/msatQueue.c @@ -0,0 +1,157 @@ +/**CFile**************************************************************** + + FileName [msatQueue.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [The manager of the assignment propagation queue.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatQueue.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +struct Msat_Queue_t_ +{ + int nVars; + int * pVars; + int iFirst; + int iLast; +}; + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates the variable propagation queue.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Queue_t * Msat_QueueAlloc( int nVars ) +{ + Msat_Queue_t * p; + p = ALLOC( Msat_Queue_t, 1 ); + memset( p, 0, sizeof(Msat_Queue_t) ); + p->nVars = nVars; + p->pVars = ALLOC( int, nVars ); + return p; +} + +/**Function************************************************************* + + Synopsis [Deallocate the variable propagation queue.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_QueueFree( Msat_Queue_t * p ) +{ + free( p->pVars ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Reads the queue size.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_QueueReadSize( Msat_Queue_t * p ) +{ + return p->iLast - p->iFirst; +} + +/**Function************************************************************* + + Synopsis [Insert an entry into the queue.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_QueueInsert( Msat_Queue_t * p, int Lit ) +{ + if ( p->iLast == p->nVars ) + { + int i; + assert( 0 ); + for ( i = 0; i < p->iLast; i++ ) + printf( "entry = %2d lit = %2d var = %2d \n", i, p->pVars[i], p->pVars[i]/2 ); + } + assert( p->iLast < p->nVars ); + p->pVars[p->iLast++] = Lit; +} + +/**Function************************************************************* + + Synopsis [Extracts an entry from the queue.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_QueueExtract( Msat_Queue_t * p ) +{ + if ( p->iFirst == p->iLast ) + return -1; + return p->pVars[p->iFirst++]; +} + +/**Function************************************************************* + + Synopsis [Resets the queue.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_QueueClear( Msat_Queue_t * p ) +{ + p->iFirst = 0; + p->iLast = 0; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatRead.c b/src/sat/msat/msatRead.c new file mode 100644 index 00000000..738562ef --- /dev/null +++ b/src/sat/msat/msatRead.c @@ -0,0 +1,268 @@ +/**CFile**************************************************************** + + FileName [msatRead.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [The reader of the CNF formula in DIMACS format.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatRead.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static char * Msat_FileRead( FILE * pFile ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Read the file into the internal buffer.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Msat_FileRead( FILE * pFile ) +{ + int nFileSize; + char * pBuffer; + // get the file size, in bytes + fseek( pFile, 0, SEEK_END ); + nFileSize = ftell( pFile ); + // move the file current reading position to the beginning + rewind( pFile ); + // load the contents of the file into memory + pBuffer = ALLOC( char, nFileSize + 3 ); + fread( pBuffer, nFileSize, 1, pFile ); + // terminate the string with '\0' + pBuffer[ nFileSize + 0] = '\n'; + pBuffer[ nFileSize + 1] = '\0'; + return pBuffer; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static void Msat_ReadWhitespace( char ** pIn ) +{ + while ((**pIn >= 9 && **pIn <= 13) || **pIn == 32) + (*pIn)++; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static void Msat_ReadNotWhitespace( char ** pIn ) +{ + while ( !((**pIn >= 9 && **pIn <= 13) || **pIn == 32) ) + (*pIn)++; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static void skipLine( char ** pIn ) +{ + while ( 1 ) + { + if (**pIn == 0) + return; + if (**pIn == '\n') + { + (*pIn)++; + return; + } + (*pIn)++; + } +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static int Msat_ReadInt( char ** pIn ) +{ + int val = 0; + bool neg = 0; + + Msat_ReadWhitespace( pIn ); + if ( **pIn == '-' ) + neg = 1, + (*pIn)++; + else if ( **pIn == '+' ) + (*pIn)++; + if ( **pIn < '0' || **pIn > '9' ) + fprintf(stderr, "PARSE ERROR! Unexpected char: %c\n", **pIn), + exit(1); + while ( **pIn >= '0' && **pIn <= '9' ) + val = val*10 + (**pIn - '0'), + (*pIn)++; + return neg ? -val : val; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static void Msat_ReadClause( char ** pIn, Msat_Solver_t * p, Msat_IntVec_t * pLits ) +{ + int nVars = Msat_SolverReadVarNum( p ); + int parsed_lit, var, sign; + + Msat_IntVecClear( pLits ); + while ( 1 ) + { + parsed_lit = Msat_ReadInt(pIn); + if ( parsed_lit == 0 ) + break; + var = abs(parsed_lit) - 1; + sign = (parsed_lit > 0); + if ( var >= nVars ) + { + printf( "Variable %d is larger than the number of allocated variables (%d).\n", var+1, nVars ); + exit(1); + } + Msat_IntVecPush( pLits, MSAT_VAR2LIT(var, !sign) ); + } +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static bool Msat_ReadDimacs( char * pText, Msat_Solver_t ** pS, bool fVerbose ) +{ + Msat_Solver_t * p; + Msat_IntVec_t * pLits; + char * pIn = pText; + int nVars, nClas; + while ( 1 ) + { + Msat_ReadWhitespace( &pIn ); + if ( *pIn == 0 ) + break; + else if ( *pIn == 'c' ) + skipLine( &pIn ); + else if ( *pIn == 'p' ) + { + pIn++; + Msat_ReadWhitespace( &pIn ); + Msat_ReadNotWhitespace( &pIn ); + + nVars = Msat_ReadInt( &pIn ); + nClas = Msat_ReadInt( &pIn ); + skipLine( &pIn ); + // start the solver + p = Msat_SolverAlloc( nVars, 1, 1, 1, 1, 0 ); + Msat_SolverClean( p, nVars ); + Msat_SolverSetVerbosity( p, fVerbose ); + // allocate the vector + pLits = Msat_IntVecAlloc( nVars ); + } + else + { + if ( p == NULL ) + { + printf( "There is no parameter line.\n" ); + exit(1); + } + Msat_ReadClause( &pIn, p, pLits ); + if ( !Msat_SolverAddClause( p, pLits ) ) + return 0; + } + } + Msat_IntVecFree( pLits ); + *pS = p; + return Msat_SolverSimplifyDB( p ); +} + +/**Function************************************************************* + + Synopsis [Starts the solver and reads the DIMAC file.] + + Description [Returns FALSE upon immediate conflict.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_SolverParseDimacs( FILE * pFile, Msat_Solver_t ** p, int fVerbose ) +{ + char * pText; + bool Value; + pText = Msat_FileRead( pFile ); + Value = Msat_ReadDimacs( pText, p, fVerbose ); + free( pText ); + return Value; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatSolverApi.c b/src/sat/msat/msatSolverApi.c new file mode 100644 index 00000000..ee3507a6 --- /dev/null +++ b/src/sat/msat/msatSolverApi.c @@ -0,0 +1,500 @@ +/**CFile**************************************************************** + + FileName [msatSolverApi.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [APIs of the SAT solver.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatSolverApi.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static void Msat_SolverSetupTruthTables( unsigned uTruths[][2] ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Simple SAT solver APIs.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_SolverReadVarNum( Msat_Solver_t * p ) { return p->nVars; } +int Msat_SolverReadClauseNum( Msat_Solver_t * p ) { return p->nClauses; } +int Msat_SolverReadVarAllocNum( Msat_Solver_t * p ) { return p->nVarsAlloc; } +int Msat_SolverReadDecisionLevel( Msat_Solver_t * p ) { return Msat_IntVecReadSize(p->vTrailLim); } +int * Msat_SolverReadDecisionLevelArray( Msat_Solver_t * p ) { return p->pLevel; } +Msat_Clause_t ** Msat_SolverReadReasonArray( Msat_Solver_t * p ) { return p->pReasons; } +Msat_Lit_t Msat_SolverReadVarValue( Msat_Solver_t * p, Msat_Var_t Var ) { return p->pAssigns[Var]; } +Msat_ClauseVec_t * Msat_SolverReadLearned( Msat_Solver_t * p ) { return p->vLearned; } +Msat_ClauseVec_t ** Msat_SolverReadWatchedArray( Msat_Solver_t * p ) { return p->pvWatched; } +int * Msat_SolverReadAssignsArray( Msat_Solver_t * p ) { return p->pAssigns; } +int * Msat_SolverReadModelArray( Msat_Solver_t * p ) { return p->pModel; } +int Msat_SolverReadBackTracks( Msat_Solver_t * p ) { return (int)p->Stats.nConflicts; } +int Msat_SolverReadInspects( Msat_Solver_t * p ) { return (int)p->Stats.nInspects; } +Msat_MmStep_t * Msat_SolverReadMem( Msat_Solver_t * p ) { return p->pMem; } +int * Msat_SolverReadSeenArray( Msat_Solver_t * p ) { return p->pSeen; } +int Msat_SolverIncrementSeenId( Msat_Solver_t * p ) { return ++p->nSeenId; } +void Msat_SolverSetVerbosity( Msat_Solver_t * p, int fVerbose ) { p->fVerbose = fVerbose; } +void Msat_SolverClausesIncrement( Msat_Solver_t * p ) { p->nClausesAlloc++; } +void Msat_SolverClausesDecrement( Msat_Solver_t * p ) { p->nClausesAlloc--; } +void Msat_SolverClausesIncrementL( Msat_Solver_t * p ) { p->nClausesAllocL++; } +void Msat_SolverClausesDecrementL( Msat_Solver_t * p ) { p->nClausesAllocL--; } +void Msat_SolverMarkLastClauseTypeA( Msat_Solver_t * p ) { Msat_ClauseSetTypeA( Msat_ClauseVecReadEntry( p->vClauses, Msat_ClauseVecReadSize(p->vClauses)-1 ), 1 ); } +void Msat_SolverMarkClausesStart( Msat_Solver_t * p ) { p->nClausesStart = Msat_ClauseVecReadSize(p->vClauses); } +float * Msat_SolverReadFactors( Msat_Solver_t * p ) { return p->pFactors; } + +/**Function************************************************************* + + Synopsis [Reads the clause with the given number.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Clause_t * Msat_SolverReadClause( Msat_Solver_t * p, int Num ) +{ + int nClausesP; + assert( Num < p->nClauses ); + nClausesP = Msat_ClauseVecReadSize( p->vClauses ); + if ( Num < nClausesP ) + return Msat_ClauseVecReadEntry( p->vClauses, Num ); + return Msat_ClauseVecReadEntry( p->vLearned, Num - nClausesP ); +} + +/**Function************************************************************* + + Synopsis [Reads the clause with the given number.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_ClauseVec_t * Msat_SolverReadAdjacents( Msat_Solver_t * p ) +{ + return p->vAdjacents; +} + +/**Function************************************************************* + + Synopsis [Reads the clause with the given number.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_IntVec_t * Msat_SolverReadConeVars( Msat_Solver_t * p ) +{ + return p->vConeVars; +} + +/**Function************************************************************* + + Synopsis [Reads the clause with the given number.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_IntVec_t * Msat_SolverReadVarsUsed( Msat_Solver_t * p ) +{ + return p->vVarsUsed; +} + + +/**Function************************************************************* + + Synopsis [Allocates the solver.] + + Description [After the solver is allocated, the procedure + Msat_SolverClean() should be called to set the number of variables.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Solver_t * Msat_SolverAlloc( int nVarsAlloc, + double dClaInc, double dClaDecay, + double dVarInc, double dVarDecay, + bool fVerbose ) +{ + Msat_Solver_t * p; + int i; + + assert(sizeof(Msat_Lit_t) == sizeof(unsigned)); + assert(sizeof(float) == sizeof(unsigned)); + + p = ALLOC( Msat_Solver_t, 1 ); + memset( p, 0, sizeof(Msat_Solver_t) ); + + p->nVarsAlloc = nVarsAlloc; + p->nVars = 0; + + p->nClauses = 0; + p->vClauses = Msat_ClauseVecAlloc( 512 ); + p->vLearned = Msat_ClauseVecAlloc( 512 ); + + p->dClaInc = dClaInc; + p->dClaDecay = dClaDecay; + p->dVarInc = dVarInc; + p->dVarDecay = dVarDecay; + + p->pdActivity = ALLOC( double, p->nVarsAlloc ); + p->pFactors = ALLOC( float, p->nVarsAlloc ); + for ( i = 0; i < p->nVarsAlloc; i++ ) + { + p->pdActivity[i] = 0.0; + p->pFactors[i] = 1.0; + } + + p->pAssigns = ALLOC( int, p->nVarsAlloc ); + p->pModel = ALLOC( int, p->nVarsAlloc ); + for ( i = 0; i < p->nVarsAlloc; i++ ) + p->pAssigns[i] = MSAT_VAR_UNASSIGNED; +// p->pOrder = Msat_OrderAlloc( p->pAssigns, p->pdActivity, p->nVarsAlloc ); + p->pOrder = Msat_OrderAlloc( p ); + + p->pvWatched = ALLOC( Msat_ClauseVec_t *, 2 * p->nVarsAlloc ); + for ( i = 0; i < 2 * p->nVarsAlloc; i++ ) + p->pvWatched[i] = Msat_ClauseVecAlloc( 16 ); + p->pQueue = Msat_QueueAlloc( p->nVarsAlloc ); + + p->vTrail = Msat_IntVecAlloc( p->nVarsAlloc ); + p->vTrailLim = Msat_IntVecAlloc( p->nVarsAlloc ); + p->pReasons = ALLOC( Msat_Clause_t *, p->nVarsAlloc ); + memset( p->pReasons, 0, sizeof(Msat_Clause_t *) * p->nVarsAlloc ); + p->pLevel = ALLOC( int, p->nVarsAlloc ); + for ( i = 0; i < p->nVarsAlloc; i++ ) + p->pLevel[i] = -1; + p->dRandSeed = 91648253; + p->fVerbose = fVerbose; + p->dProgress = 0.0; +// p->pModel = Msat_IntVecAlloc( p->nVarsAlloc ); + p->pMem = Msat_MmStepStart( 10 ); + + p->vConeVars = Msat_IntVecAlloc( p->nVarsAlloc ); + p->vAdjacents = Msat_ClauseVecAlloc( p->nVarsAlloc ); + for ( i = 0; i < p->nVarsAlloc; i++ ) + Msat_ClauseVecPush( p->vAdjacents, (Msat_Clause_t *)Msat_IntVecAlloc(5) ); + p->vVarsUsed = Msat_IntVecAlloc( p->nVarsAlloc ); + Msat_IntVecFill( p->vVarsUsed, p->nVarsAlloc, 1 ); + + + p->pSeen = ALLOC( int, p->nVarsAlloc ); + memset( p->pSeen, 0, sizeof(int) * p->nVarsAlloc ); + p->nSeenId = 1; + p->vReason = Msat_IntVecAlloc( p->nVarsAlloc ); + p->vTemp = Msat_IntVecAlloc( p->nVarsAlloc ); + return p; +} + +/**Function************************************************************* + + Synopsis [Resizes the solver.] + + Description [Assumes that the solver contains some clauses, and that + it is currently between the calls. Resizes the solver to accomodate + more variables.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverResize( Msat_Solver_t * p, int nVarsAlloc ) +{ + int nVarsAllocOld, i; + + nVarsAllocOld = p->nVarsAlloc; + p->nVarsAlloc = nVarsAlloc; + + p->pdActivity = REALLOC( double, p->pdActivity, p->nVarsAlloc ); + p->pFactors = REALLOC( float, p->pFactors, p->nVarsAlloc ); + for ( i = nVarsAllocOld; i < p->nVarsAlloc; i++ ) + { + p->pdActivity[i] = 0.0; + p->pFactors[i] = 1.0; + } + + p->pAssigns = REALLOC( int, p->pAssigns, p->nVarsAlloc ); + p->pModel = REALLOC( int, p->pModel, p->nVarsAlloc ); + for ( i = nVarsAllocOld; i < p->nVarsAlloc; i++ ) + p->pAssigns[i] = MSAT_VAR_UNASSIGNED; + +// Msat_OrderRealloc( p->pOrder, p->pAssigns, p->pdActivity, p->nVarsAlloc ); + Msat_OrderSetBounds( p->pOrder, p->nVarsAlloc ); + + p->pvWatched = REALLOC( Msat_ClauseVec_t *, p->pvWatched, 2 * p->nVarsAlloc ); + for ( i = 2 * nVarsAllocOld; i < 2 * p->nVarsAlloc; i++ ) + p->pvWatched[i] = Msat_ClauseVecAlloc( 16 ); + + Msat_QueueFree( p->pQueue ); + p->pQueue = Msat_QueueAlloc( p->nVarsAlloc ); + + p->pReasons = REALLOC( Msat_Clause_t *, p->pReasons, p->nVarsAlloc ); + p->pLevel = REALLOC( int, p->pLevel, p->nVarsAlloc ); + for ( i = nVarsAllocOld; i < p->nVarsAlloc; i++ ) + { + p->pReasons[i] = NULL; + p->pLevel[i] = -1; + } + + p->pSeen = REALLOC( int, p->pSeen, p->nVarsAlloc ); + for ( i = nVarsAllocOld; i < p->nVarsAlloc; i++ ) + p->pSeen[i] = 0; + + Msat_IntVecGrow( p->vTrail, p->nVarsAlloc ); + Msat_IntVecGrow( p->vTrailLim, p->nVarsAlloc ); + + // make sure the array of adjucents has room to store the variable numbers + for ( i = Msat_ClauseVecReadSize(p->vAdjacents); i < p->nVarsAlloc; i++ ) + Msat_ClauseVecPush( p->vAdjacents, (Msat_Clause_t *)Msat_IntVecAlloc(5) ); + Msat_IntVecFill( p->vVarsUsed, p->nVarsAlloc, 1 ); +} + +/**Function************************************************************* + + Synopsis [Prepares the solver.] + + Description [Cleans the solver assuming that the problem will involve + the given number of variables (nVars). This procedure is useful + for many small (incremental) SAT problems, to prevent the solver + from being reallocated each time.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverClean( Msat_Solver_t * p, int nVars ) +{ + int i; + // free the clauses + int nClauses; + Msat_Clause_t ** pClauses; + + assert( p->nVarsAlloc >= nVars ); + p->nVars = nVars; + p->nClauses = 0; + + nClauses = Msat_ClauseVecReadSize( p->vClauses ); + pClauses = Msat_ClauseVecReadArray( p->vClauses ); + for ( i = 0; i < nClauses; i++ ) + Msat_ClauseFree( p, pClauses[i], 0 ); +// Msat_ClauseVecFree( p->vClauses ); + Msat_ClauseVecClear( p->vClauses ); + + nClauses = Msat_ClauseVecReadSize( p->vLearned ); + pClauses = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = 0; i < nClauses; i++ ) + Msat_ClauseFree( p, pClauses[i], 0 ); +// Msat_ClauseVecFree( p->vLearned ); + Msat_ClauseVecClear( p->vLearned ); + +// FREE( p->pdActivity ); + for ( i = 0; i < p->nVars; i++ ) + p->pdActivity[i] = 0; + +// Msat_OrderFree( p->pOrder ); +// Msat_OrderClean( p->pOrder, p->nVars, NULL ); + Msat_OrderSetBounds( p->pOrder, p->nVars ); + + for ( i = 0; i < 2 * p->nVars; i++ ) +// Msat_ClauseVecFree( p->pvWatched[i] ); + Msat_ClauseVecClear( p->pvWatched[i] ); +// FREE( p->pvWatched ); +// Msat_QueueFree( p->pQueue ); + Msat_QueueClear( p->pQueue ); + +// FREE( p->pAssigns ); + for ( i = 0; i < p->nVars; i++ ) + p->pAssigns[i] = MSAT_VAR_UNASSIGNED; +// Msat_IntVecFree( p->vTrail ); + Msat_IntVecClear( p->vTrail ); +// Msat_IntVecFree( p->vTrailLim ); + Msat_IntVecClear( p->vTrailLim ); +// FREE( p->pReasons ); + memset( p->pReasons, 0, sizeof(Msat_Clause_t *) * p->nVars ); +// FREE( p->pLevel ); + for ( i = 0; i < p->nVars; i++ ) + p->pLevel[i] = -1; +// Msat_IntVecFree( p->pModel ); +// Msat_MmStepStop( p->pMem, 0 ); + p->dRandSeed = 91648253; + p->dProgress = 0.0; + +// FREE( p->pSeen ); + memset( p->pSeen, 0, sizeof(int) * p->nVars ); + p->nSeenId = 1; +// Msat_IntVecFree( p->vReason ); + Msat_IntVecClear( p->vReason ); +// Msat_IntVecFree( p->vTemp ); + Msat_IntVecClear( p->vTemp ); +// printf(" The number of clauses remaining = %d (%d).\n", p->nClausesAlloc, p->nClausesAllocL ); +// FREE( p ); +} + +/**Function************************************************************* + + Synopsis [Frees the solver.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverFree( Msat_Solver_t * p ) +{ + int i; + + // free the clauses + int nClauses; + Msat_Clause_t ** pClauses; +//printf( "clauses = %d. learned = %d.\n", Msat_ClauseVecReadSize( p->vClauses ), +// Msat_ClauseVecReadSize( p->vLearned ) ); + + nClauses = Msat_ClauseVecReadSize( p->vClauses ); + pClauses = Msat_ClauseVecReadArray( p->vClauses ); + for ( i = 0; i < nClauses; i++ ) + Msat_ClauseFree( p, pClauses[i], 0 ); + Msat_ClauseVecFree( p->vClauses ); + + nClauses = Msat_ClauseVecReadSize( p->vLearned ); + pClauses = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = 0; i < nClauses; i++ ) + Msat_ClauseFree( p, pClauses[i], 0 ); + Msat_ClauseVecFree( p->vLearned ); + + FREE( p->pdActivity ); + FREE( p->pFactors ); + Msat_OrderFree( p->pOrder ); + + for ( i = 0; i < 2 * p->nVarsAlloc; i++ ) + Msat_ClauseVecFree( p->pvWatched[i] ); + FREE( p->pvWatched ); + Msat_QueueFree( p->pQueue ); + + FREE( p->pAssigns ); + FREE( p->pModel ); + Msat_IntVecFree( p->vTrail ); + Msat_IntVecFree( p->vTrailLim ); + FREE( p->pReasons ); + FREE( p->pLevel ); + + Msat_MmStepStop( p->pMem, 0 ); + + nClauses = Msat_ClauseVecReadSize( p->vAdjacents ); + pClauses = Msat_ClauseVecReadArray( p->vAdjacents ); + for ( i = 0; i < nClauses; i++ ) + Msat_IntVecFree( (Msat_IntVec_t *)pClauses[i] ); + Msat_ClauseVecFree( p->vAdjacents ); + Msat_IntVecFree( p->vConeVars ); + Msat_IntVecFree( p->vVarsUsed ); + + FREE( p->pSeen ); + Msat_IntVecFree( p->vReason ); + Msat_IntVecFree( p->vTemp ); + FREE( p ); +} + +/**Function************************************************************* + + Synopsis [Prepares the solver to run on a subset of variables.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverPrepare( Msat_Solver_t * p, Msat_IntVec_t * vVars ) +{ + + int i; + // undo the previous data + for ( i = 0; i < p->nVarsAlloc; i++ ) + { + p->pAssigns[i] = MSAT_VAR_UNASSIGNED; + p->pReasons[i] = NULL; + p->pLevel[i] = -1; + p->pdActivity[i] = 0.0; + } + + // set the new variable order + Msat_OrderClean( p->pOrder, vVars ); + + Msat_QueueClear( p->pQueue ); + Msat_IntVecClear( p->vTrail ); + Msat_IntVecClear( p->vTrailLim ); + p->dProgress = 0.0; +} + +/**Function************************************************************* + + Synopsis [Sets up the truth tables.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverSetupTruthTables( unsigned uTruths[][2] ) +{ + int m, v; + // set up the truth tables + for ( m = 0; m < 32; m++ ) + for ( v = 0; v < 5; v++ ) + if ( m & (1 << v) ) + uTruths[v][0] |= (1 << m); + // make adjustments for the case of 6 variables + for ( v = 0; v < 5; v++ ) + uTruths[v][1] = uTruths[v][0]; + uTruths[5][0] = 0; + uTruths[5][1] = ~((unsigned)0); +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatSolverCore.c b/src/sat/msat/msatSolverCore.c new file mode 100644 index 00000000..f9fee73c --- /dev/null +++ b/src/sat/msat/msatSolverCore.c @@ -0,0 +1,212 @@ +/**CFile**************************************************************** + + FileName [msatSolverCore.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [The SAT solver core procedures.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatSolverCore.c,v 1.2 2004/05/12 03:37:40 satrajit Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Adds one variable to the solver.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_SolverAddVar( Msat_Solver_t * p, int Level ) +{ + if ( p->nVars == p->nVarsAlloc ) + Msat_SolverResize( p, 2 * p->nVarsAlloc ); + p->pLevel[p->nVars] = Level; + p->nVars++; + return 1; +} + +/**Function************************************************************* + + Synopsis [Adds one clause to the solver's clause database.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_SolverAddClause( Msat_Solver_t * p, Msat_IntVec_t * vLits ) +{ + Msat_Clause_t * pC; + bool Value; + Value = Msat_ClauseCreate( p, vLits, 0, &pC ); + if ( pC != NULL ) + Msat_ClauseVecPush( p->vClauses, pC ); +// else if ( p->fProof ) +// Msat_ClauseCreateFake( p, vLits ); + return Value; +} + +/**Function************************************************************* + + Synopsis [Returns search-space coverage. Not extremely reliable.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +double Msat_SolverProgressEstimate( Msat_Solver_t * p ) +{ + double dProgress = 0.0; + double dF = 1.0 / p->nVars; + int i; + for ( i = 0; i < p->nVars; i++ ) + if ( p->pAssigns[i] != MSAT_VAR_UNASSIGNED ) + dProgress += pow( dF, p->pLevel[i] ); + return dProgress / p->nVars; +} + +/**Function************************************************************* + + Synopsis [Prints statistics about the solver.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverPrintStats( Msat_Solver_t * p ) +{ + printf("C solver (%d vars; %d clauses; %d learned):\n", + p->nVars, Msat_ClauseVecReadSize(p->vClauses), Msat_ClauseVecReadSize(p->vLearned) ); + printf("starts : %lld\n", p->Stats.nStarts); + printf("conflicts : %lld\n", p->Stats.nConflicts); + printf("decisions : %lld\n", p->Stats.nDecisions); + printf("propagations : %lld\n", p->Stats.nPropagations); + printf("inspects : %lld\n", p->Stats.nInspects); +} + +/**Function************************************************************* + + Synopsis [Top-level solve.] + + Description [If using assumptions (non-empty 'assumps' vector), you must + call 'simplifyDB()' first to see that no top-level conflict is present + (which would put the solver in an undefined state. If the last argument + is given (vProj), the solver enumerates through the satisfying solutions, + which are projected on the variables listed in this array. Note that the + variables in the array may be complemented, in which case the derived + assignment for the variable is complemented.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_SolverSolve( Msat_Solver_t * p, Msat_IntVec_t * vAssumps, int nBackTrackLimit, int nTimeLimit ) +{ + Msat_SearchParams_t Params = { 0.95, 0.999 }; + double nConflictsLimit, nLearnedLimit; + Msat_Type_t Status; + int timeStart = clock(); + int64 nConflictsOld = p->Stats.nConflicts; + int64 nDecisionsOld = p->Stats.nDecisions; + +// p->pFreq = ALLOC( int, p->nVarsAlloc ); +// memset( p->pFreq, 0, sizeof(int) * p->nVarsAlloc ); + + if ( vAssumps ) + { + int * pAssumps, nAssumps, i; + + assert( Msat_IntVecReadSize(p->vTrailLim) == 0 ); + + nAssumps = Msat_IntVecReadSize( vAssumps ); + pAssumps = Msat_IntVecReadArray( vAssumps ); + for ( i = 0; i < nAssumps; i++ ) + { + if ( !Msat_SolverAssume(p, pAssumps[i]) || Msat_SolverPropagate(p) ) + { + Msat_QueueClear( p->pQueue ); + Msat_SolverCancelUntil( p, 0 ); + return MSAT_FALSE; + } + } + } + p->nLevelRoot = Msat_SolverReadDecisionLevel(p); + p->nClausesInit = Msat_ClauseVecReadSize( p->vClauses ); + nConflictsLimit = 100; + nLearnedLimit = Msat_ClauseVecReadSize(p->vClauses) / 3; + Status = MSAT_UNKNOWN; + p->nBackTracks = (int)p->Stats.nConflicts; + while ( Status == MSAT_UNKNOWN ) + { + if ( p->fVerbose ) + printf("Solving -- conflicts=%d learnts=%d progress=%.4f %%\n", + (int)nConflictsLimit, (int)nLearnedLimit, p->dProgress*100); + Status = Msat_SolverSearch( p, (int)nConflictsLimit, (int)nLearnedLimit, nBackTrackLimit, &Params ); + nConflictsLimit *= 1.5; + nLearnedLimit *= 1.1; + // if the limit on the number of backtracks is given, quit the restart loop + if ( nBackTrackLimit > 0 && (int)p->Stats.nConflicts - p->nBackTracks > nBackTrackLimit ) + break; + // if the runtime limit is exceeded, quit the restart loop + if ( nTimeLimit > 0 && clock() - timeStart >= nTimeLimit * CLOCKS_PER_SEC ) + break; + } + Msat_SolverCancelUntil( p, 0 ); + p->nBackTracks = (int)p->Stats.nConflicts - p->nBackTracks; +/* + PRT( "True solver runtime", clock() - timeStart ); + // print the statistics + { + int i, Counter = 0; + for ( i = 0; i < p->nVars; i++ ) + if ( p->pFreq[i] > 0 ) + { + printf( "%d ", p->pFreq[i] ); + Counter++; + } + if ( Counter ) + printf( "\n" ); + printf( "Total = %d. Used = %d. Decisions = %d. Imps = %d. Conflicts = %d. ", p->nVars, Counter, (int)p->Stats.nDecisions, (int)p->Stats.nPropagations, (int)p->Stats.nConflicts ); + PRT( "Time", clock() - timeStart ); + } +*/ + return Status; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatSolverIo.c b/src/sat/msat/msatSolverIo.c new file mode 100644 index 00000000..05b7f6a9 --- /dev/null +++ b/src/sat/msat/msatSolverIo.c @@ -0,0 +1,177 @@ +/**CFile**************************************************************** + + FileName [msatSolverIo.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Input/output of CNFs.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatSolverIo.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static char * Msat_TimeStamp(); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverPrintAssignment( Msat_Solver_t * p ) +{ + int i; + printf( "Current assignments are: \n" ); + for ( i = 0; i < p->nVars; i++ ) + printf( "%d", i % 10 ); + printf( "\n" ); + for ( i = 0; i < p->nVars; i++ ) + if ( p->pAssigns[i] == MSAT_VAR_UNASSIGNED ) + printf( "." ); + else + { + assert( i == MSAT_LIT2VAR(p->pAssigns[i]) ); + if ( MSAT_LITSIGN(p->pAssigns[i]) ) + printf( "0" ); + else + printf( "1" ); + } + printf( "\n" ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverPrintClauses( Msat_Solver_t * p ) +{ + Msat_Clause_t ** pClauses; + int nClauses, i; + + printf( "Original clauses: \n" ); + nClauses = Msat_ClauseVecReadSize( p->vClauses ); + pClauses = Msat_ClauseVecReadArray( p->vClauses ); + for ( i = 0; i < nClauses; i++ ) + { + printf( "%3d: ", i ); + Msat_ClausePrint( pClauses[i] ); + } + + printf( "Learned clauses: \n" ); + nClauses = Msat_ClauseVecReadSize( p->vLearned ); + pClauses = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = 0; i < nClauses; i++ ) + { + printf( "%3d: ", i ); + Msat_ClausePrint( pClauses[i] ); + } + + printf( "Variable activity: \n" ); + for ( i = 0; i < p->nVars; i++ ) + printf( "%3d : %.4f\n", i, p->pdActivity[i] ); +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverWriteDimacs( Msat_Solver_t * p, char * pFileName ) +{ + FILE * pFile; + Msat_Clause_t ** pClauses; + int nClauses, i; + + nClauses = Msat_ClauseVecReadSize(p->vClauses) + Msat_ClauseVecReadSize(p->vLearned); + for ( i = 0; i < p->nVars; i++ ) + nClauses += ( p->pLevel[i] == 0 ); + + pFile = fopen( pFileName, "wb" ); + fprintf( pFile, "c Produced by Msat_SolverWriteDimacs() on %s\n", Msat_TimeStamp() ); + fprintf( pFile, "p cnf %d %d\n", p->nVars, nClauses ); + + nClauses = Msat_ClauseVecReadSize( p->vClauses ); + pClauses = Msat_ClauseVecReadArray( p->vClauses ); + for ( i = 0; i < nClauses; i++ ) + Msat_ClauseWriteDimacs( pFile, pClauses[i], 1 ); + + nClauses = Msat_ClauseVecReadSize( p->vLearned ); + pClauses = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = 0; i < nClauses; i++ ) + Msat_ClauseWriteDimacs( pFile, pClauses[i], 1 ); + + // write zero-level assertions + for ( i = 0; i < p->nVars; i++ ) + if ( p->pLevel[i] == 0 ) + fprintf( pFile, "%s%d 0\n", ((p->pAssigns[i]&1)? "-": ""), i + 1 ); + + fprintf( pFile, "\n" ); + fclose( pFile ); +} + + +/**Function************************************************************* + + Synopsis [Returns the time stamp.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Msat_TimeStamp() +{ + static char Buffer[100]; + time_t ltime; + char * TimeStamp; + // get the current time + time( <ime ); + TimeStamp = asctime( localtime( <ime ) ); + TimeStamp[ strlen(TimeStamp) - 1 ] = 0; + strcpy( Buffer, TimeStamp ); + return Buffer; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatSolverSearch.c b/src/sat/msat/msatSolverSearch.c new file mode 100644 index 00000000..11a6540c --- /dev/null +++ b/src/sat/msat/msatSolverSearch.c @@ -0,0 +1,629 @@ +/**CFile**************************************************************** + + FileName [msatSolverSearch.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [The search part of the solver.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatSolverSearch.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static void Msat_SolverUndoOne( Msat_Solver_t * p ); +static void Msat_SolverCancel( Msat_Solver_t * p ); +static Msat_Clause_t * Msat_SolverRecord( Msat_Solver_t * p, Msat_IntVec_t * vLits ); +static void Msat_SolverAnalyze( Msat_Solver_t * p, Msat_Clause_t * pC, Msat_IntVec_t * vLits_out, int * pLevel_out ); +static void Msat_SolverReduceDB( Msat_Solver_t * p ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Makes the next assumption (Lit).] + + Description [Returns FALSE if immediate conflict.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_SolverAssume( Msat_Solver_t * p, Msat_Lit_t Lit ) +{ + assert( Msat_QueueReadSize(p->pQueue) == 0 ); + if ( p->fVerbose ) + printf(L_IND"assume("L_LIT")\n", L_ind, L_lit(Lit)); + Msat_IntVecPush( p->vTrailLim, Msat_IntVecReadSize(p->vTrail) ); +// assert( Msat_IntVecReadSize(p->vTrailLim) <= Msat_IntVecReadSize(p->vTrail) + 1 ); +// assert( Msat_IntVecReadSize( p->vTrailLim ) < p->nVars ); + return Msat_SolverEnqueue( p, Lit, NULL ); +} + +/**Function************************************************************* + + Synopsis [Reverts one variable binding on the trail.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverUndoOne( Msat_Solver_t * p ) +{ + Msat_Lit_t Lit; + Msat_Var_t Var; + Lit = Msat_IntVecPop( p->vTrail ); + Var = MSAT_LIT2VAR(Lit); + p->pAssigns[Var] = MSAT_VAR_UNASSIGNED; + p->pReasons[Var] = NULL; + p->pLevel[Var] = -1; +// Msat_OrderUndo( p->pOrder, Var ); + Msat_OrderVarUnassigned( p->pOrder, Var ); + + if ( p->fVerbose ) + printf(L_IND"unbind("L_LIT")\n", L_ind, L_lit(Lit)); +} + +/**Function************************************************************* + + Synopsis [Reverts to the state before last Msat_SolverAssume().] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverCancel( Msat_Solver_t * p ) +{ + int c; + assert( Msat_QueueReadSize(p->pQueue) == 0 ); + if ( p->fVerbose ) + { + if ( Msat_IntVecReadSize(p->vTrail) != Msat_IntVecReadEntryLast(p->vTrailLim) ) + { + Msat_Lit_t Lit; + Lit = Msat_IntVecReadEntry( p->vTrail, Msat_IntVecReadEntryLast(p->vTrailLim) ); + printf(L_IND"cancel("L_LIT")\n", L_ind, L_lit(Lit)); + } + } + for ( c = Msat_IntVecReadSize(p->vTrail) - Msat_IntVecPop( p->vTrailLim ); c != 0; c-- ) + Msat_SolverUndoOne( p ); +} + +/**Function************************************************************* + + Synopsis [Reverts to the state at given level.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverCancelUntil( Msat_Solver_t * p, int Level ) +{ + while ( Msat_IntVecReadSize(p->vTrailLim) > Level ) + Msat_SolverCancel(p); +} + + +/**Function************************************************************* + + Synopsis [Record a clause and drive backtracking.] + + Description [vLits[0] must contain the asserting literal.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Clause_t * Msat_SolverRecord( Msat_Solver_t * p, Msat_IntVec_t * vLits ) +{ + Msat_Clause_t * pC; + int Value; + assert( Msat_IntVecReadSize(vLits) != 0 ); + Value = Msat_ClauseCreate( p, vLits, 1, &pC ); + assert( Value ); + Value = Msat_SolverEnqueue( p, Msat_IntVecReadEntry(vLits,0), pC ); + assert( Value ); + if ( pC ) + Msat_ClauseVecPush( p->vLearned, pC ); + return pC; +} + +/**Function************************************************************* + + Synopsis [Enqueues one variable assignment.] + + Description [Puts a new fact on the propagation queue and immediately + updates the variable value. Should a conflict arise, FALSE is returned. + Otherwise returns TRUE.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_SolverEnqueue( Msat_Solver_t * p, Msat_Lit_t Lit, Msat_Clause_t * pC ) +{ + Msat_Var_t Var = MSAT_LIT2VAR(Lit); + + // skip literals that are not in the current cone + if ( !Msat_IntVecReadEntry( p->vVarsUsed, Var ) ) + return 1; + +// assert( Msat_QueueReadSize(p->pQueue) == Msat_IntVecReadSize(p->vTrail) ); + // if the literal is assigned + // return 1 if the assignment is consistent + // return 0 if the assignment is inconsistent (conflict) + if ( p->pAssigns[Var] != MSAT_VAR_UNASSIGNED ) + return p->pAssigns[Var] == Lit; + // new fact - store it + if ( p->fVerbose ) + { +// printf(L_IND"bind("L_LIT")\n", L_ind, L_lit(Lit)); + printf(L_IND"bind("L_LIT") ", L_ind, L_lit(Lit)); + Msat_ClausePrintSymbols( pC ); + } + p->pAssigns[Var] = Lit; + p->pLevel[Var] = Msat_IntVecReadSize(p->vTrailLim); +// p->pReasons[Var] = p->pLevel[Var]? pC: NULL; + p->pReasons[Var] = pC; + Msat_IntVecPush( p->vTrail, Lit ); + Msat_QueueInsert( p->pQueue, Lit ); + + Msat_OrderVarAssigned( p->pOrder, Var ); + return 1; +} + +/**Function************************************************************* + + Synopsis [Propagates the assignments in the queue.] + + Description [Propagates all enqueued facts. If a conflict arises, + the conflicting clause is returned, otherwise NULL.] + + SideEffects [The propagation queue is empty, even if there was a conflict.] + + SeeAlso [] + +***********************************************************************/ +Msat_Clause_t * Msat_SolverPropagate( Msat_Solver_t * p ) +{ + Msat_ClauseVec_t ** pvWatched = p->pvWatched; + Msat_Clause_t ** pClauses; + Msat_Clause_t * pConflict; + Msat_Lit_t Lit, Lit_out; + int i, j, nClauses; + + // propagate all the literals in the queue + while ( (Lit = Msat_QueueExtract( p->pQueue )) >= 0 ) + { + p->Stats.nPropagations++; + // get the clauses watched by this literal + nClauses = Msat_ClauseVecReadSize( pvWatched[Lit] ); + pClauses = Msat_ClauseVecReadArray( pvWatched[Lit] ); + // go through the watched clauses and decide what to do with them + for ( i = j = 0; i < nClauses; i++ ) + { + p->Stats.nInspects++; + // clear the returned literal + Lit_out = -1; + // propagate the clause + if ( !Msat_ClausePropagate( pClauses[i], Lit, p->pAssigns, &Lit_out ) ) + { // the clause is unit + // "Lit_out" contains the new assignment to be enqueued + if ( Msat_SolverEnqueue( p, Lit_out, pClauses[i] ) ) + { // consistent assignment + // no changes to the implication queue; the watch is the same too + pClauses[j++] = pClauses[i]; + continue; + } + // remember the reason of conflict (will be returned) + pConflict = pClauses[i]; + // leave the remaning clauses in the same watched list + for ( ; i < nClauses; i++ ) + pClauses[j++] = pClauses[i]; + Msat_ClauseVecShrink( pvWatched[Lit], j ); + // clear the propagation queue + Msat_QueueClear( p->pQueue ); + return pConflict; + } + // the clause is not unit + // in this case "Lit_out" contains the new watch if it has changed + if ( Lit_out >= 0 ) + Msat_ClauseVecPush( pvWatched[Lit_out], pClauses[i] ); + else // the watch did not change + pClauses[j++] = pClauses[i]; + } + Msat_ClauseVecShrink( pvWatched[Lit], j ); + } + return NULL; +} + +/**Function************************************************************* + + Synopsis [Simplifies the data base.] + + Description [Simplify all constraints according to the current top-level + assigment (redundant constraints may be removed altogether).] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +bool Msat_SolverSimplifyDB( Msat_Solver_t * p ) +{ + Msat_ClauseVec_t * vClauses; + Msat_Clause_t ** pClauses; + int nClauses, Type, i, j; + int * pAssigns; + int Counter; + + assert( Msat_SolverReadDecisionLevel(p) == 0 ); + if ( Msat_SolverPropagate(p) != NULL ) + return 0; +//Msat_SolverPrintClauses( p ); +//Msat_SolverPrintAssignment( p ); +//printf( "Simplification\n" ); + + // simplify and reassign clause numbers + Counter = 0; + pAssigns = Msat_SolverReadAssignsArray( p ); + for ( Type = 0; Type < 2; Type++ ) + { + vClauses = Type? p->vLearned : p->vClauses; + nClauses = Msat_ClauseVecReadSize( vClauses ); + pClauses = Msat_ClauseVecReadArray( vClauses ); + for ( i = j = 0; i < nClauses; i++ ) + if ( Msat_ClauseSimplify( pClauses[i], pAssigns ) ) + Msat_ClauseFree( p, pClauses[i], 1 ); + else + { + pClauses[j++] = pClauses[i]; + Msat_ClauseSetNum( pClauses[i], Counter++ ); + } + Msat_ClauseVecShrink( vClauses, j ); + } + p->nClauses = Counter; + return 1; +} + +/**Function************************************************************* + + Synopsis [Cleans the clause databased from the useless learnt clauses.] + + Description [Removes half of the learnt clauses, minus the clauses locked + by the current assignment. Locked clauses are clauses that are reason + to a some assignment.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverReduceDB( Msat_Solver_t * p ) +{ + Msat_Clause_t ** pLearned; + int nLearned, i, j; + double dExtraLim = p->dClaInc / Msat_ClauseVecReadSize(p->vLearned); + // Remove any clause below this activity + + // sort the learned clauses in the increasing order of activity + Msat_SolverSortDB( p ); + + // discard the first half the clauses (the less active ones) + nLearned = Msat_ClauseVecReadSize( p->vLearned ); + pLearned = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = j = 0; i < nLearned / 2; i++ ) + if ( !Msat_ClauseIsLocked( p, pLearned[i]) ) + Msat_ClauseFree( p, pLearned[i], 1 ); + else + pLearned[j++] = pLearned[i]; + // filter the more active clauses and leave those above the limit + for ( ; i < nLearned; i++ ) + if ( !Msat_ClauseIsLocked( p, pLearned[i] ) && + Msat_ClauseReadActivity(pLearned[i]) < dExtraLim ) + Msat_ClauseFree( p, pLearned[i], 1 ); + else + pLearned[j++] = pLearned[i]; + Msat_ClauseVecShrink( p->vLearned, j ); +} + +/**Function************************************************************* + + Synopsis [Removes the learned clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverRemoveLearned( Msat_Solver_t * p ) +{ + Msat_Clause_t ** pLearned; + int nLearned, i; + + // discard the learned clauses + nLearned = Msat_ClauseVecReadSize( p->vLearned ); + pLearned = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = 0; i < nLearned; i++ ) + { + assert( !Msat_ClauseIsLocked( p, pLearned[i]) ); + + Msat_ClauseFree( p, pLearned[i], 1 ); + } + Msat_ClauseVecShrink( p->vLearned, 0 ); + p->nClauses = Msat_ClauseVecReadSize(p->vClauses); + + for ( i = 0; i < p->nVarsAlloc; i++ ) + p->pReasons[i] = NULL; +} + +/**Function************************************************************* + + Synopsis [Removes the recently added clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverRemoveMarked( Msat_Solver_t * p ) +{ + Msat_Clause_t ** pLearned, ** pClauses; + int nLearned, nClauses, i; + + // discard the learned clauses + nClauses = Msat_ClauseVecReadSize( p->vClauses ); + pClauses = Msat_ClauseVecReadArray( p->vClauses ); + for ( i = p->nClausesStart; i < nClauses; i++ ) + { +// assert( !Msat_ClauseIsLocked( p, pClauses[i]) ); + Msat_ClauseFree( p, pClauses[i], 1 ); + } + Msat_ClauseVecShrink( p->vClauses, p->nClausesStart ); + + // discard the learned clauses + nLearned = Msat_ClauseVecReadSize( p->vLearned ); + pLearned = Msat_ClauseVecReadArray( p->vLearned ); + for ( i = 0; i < nLearned; i++ ) + { +// assert( !Msat_ClauseIsLocked( p, pLearned[i]) ); + Msat_ClauseFree( p, pLearned[i], 1 ); + } + Msat_ClauseVecShrink( p->vLearned, 0 ); + p->nClauses = Msat_ClauseVecReadSize(p->vClauses); +/* + // undo the previous data + for ( i = 0; i < p->nVarsAlloc; i++ ) + { + p->pAssigns[i] = MSAT_VAR_UNASSIGNED; + p->pReasons[i] = NULL; + p->pLevel[i] = -1; + p->pdActivity[i] = 0.0; + } + Msat_OrderClean( p->pOrder, p->nVars, NULL ); + Msat_QueueClear( p->pQueue ); +*/ +} + + + +/**Function************************************************************* + + Synopsis [Analyze conflict and produce a reason clause.] + + Description [Current decision level must be greater than root level.] + + SideEffects [vLits_out[0] is the asserting literal at level pLevel_out.] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverAnalyze( Msat_Solver_t * p, Msat_Clause_t * pC, Msat_IntVec_t * vLits_out, int * pLevel_out ) +{ + Msat_Lit_t LitQ, Lit = MSAT_LIT_UNASSIGNED; + Msat_Var_t VarQ, Var; + int * pReasonArray, nReasonSize; + int j, pathC = 0, nLevelCur = Msat_IntVecReadSize(p->vTrailLim); + int iStep = Msat_IntVecReadSize(p->vTrail) - 1; + + // increment the seen counter + p->nSeenId++; + // empty the vector array + Msat_IntVecClear( vLits_out ); + Msat_IntVecPush( vLits_out, -1 ); // (leave room for the asserting literal) + *pLevel_out = 0; + do { + assert( pC != NULL ); // (otherwise should be UIP) + // get the reason of conflict + Msat_ClauseCalcReason( p, pC, Lit, p->vReason ); + nReasonSize = Msat_IntVecReadSize( p->vReason ); + pReasonArray = Msat_IntVecReadArray( p->vReason ); + for ( j = 0; j < nReasonSize; j++ ) { + LitQ = pReasonArray[j]; + VarQ = MSAT_LIT2VAR(LitQ); + if ( p->pSeen[VarQ] != p->nSeenId ) { + p->pSeen[VarQ] = p->nSeenId; + + // added to better fine-tune the search + Msat_SolverVarBumpActivity( p, LitQ ); + + // skip all the literals on this decision level + if ( p->pLevel[VarQ] == nLevelCur ) + pathC++; + else if ( p->pLevel[VarQ] > 0 ) { + // add the literals on other decision levels but + // exclude variables from decision level 0 + Msat_IntVecPush( vLits_out, MSAT_LITNOT(LitQ) ); + if ( *pLevel_out < p->pLevel[VarQ] ) + *pLevel_out = p->pLevel[VarQ]; + } + } + } + // Select next clause to look at: + do { +// Lit = Msat_IntVecReadEntryLast(p->vTrail); + Lit = Msat_IntVecReadEntry( p->vTrail, iStep-- ); + Var = MSAT_LIT2VAR(Lit); + pC = p->pReasons[Var]; +// Msat_SolverUndoOne( p ); + } while ( p->pSeen[Var] != p->nSeenId ); + pathC--; + } while ( pathC > 0 ); + // we do not unbind the variables above + // this will be done after conflict analysis + + Msat_IntVecWriteEntry( vLits_out, 0, MSAT_LITNOT(Lit) ); + if ( p->fVerbose ) + { + printf( L_IND"Learnt {", L_ind ); + nReasonSize = Msat_IntVecReadSize( vLits_out ); + pReasonArray = Msat_IntVecReadArray( vLits_out ); + for ( j = 0; j < nReasonSize; j++ ) + printf(" "L_LIT, L_lit(pReasonArray[j])); + printf(" } at level %d\n", *pLevel_out); + } +} + +/**Function************************************************************* + + Synopsis [The search procedure called between the restarts.] + + Description [Search for a satisfying solution as long as the number of + conflicts does not exceed the limit (nConfLimit) while keeping the number + of learnt clauses below the provided limit (nLearnedLimit). NOTE! Use + negative value for nConfLimit or nLearnedLimit to indicate infinity.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_Type_t Msat_SolverSearch( Msat_Solver_t * p, int nConfLimit, int nLearnedLimit, int nBackTrackLimit, Msat_SearchParams_t * pPars ) +{ + Msat_Clause_t * pConf; + Msat_Var_t Var; + int nLevelBack, nConfs, nAssigns, Value; + int i; + + assert( Msat_SolverReadDecisionLevel(p) == p->nLevelRoot ); + p->Stats.nStarts++; + p->dVarDecay = 1 / pPars->dVarDecay; + p->dClaDecay = 1 / pPars->dClaDecay; + + // reset the activities + for ( i = 0; i < p->nVars; i++ ) + p->pdActivity[i] = (double)p->pFactors[i]; +// p->pdActivity[i] = 0.0; + + nConfs = 0; + while ( 1 ) + { + pConf = Msat_SolverPropagate( p ); + if ( pConf != NULL ){ + // CONFLICT + if ( p->fVerbose ) + { +// printf(L_IND"**CONFLICT**\n", L_ind); + printf(L_IND"**CONFLICT** ", L_ind); + Msat_ClausePrintSymbols( pConf ); + } + // count conflicts + p->Stats.nConflicts++; + nConfs++; + + // if top level, return UNSAT + if ( Msat_SolverReadDecisionLevel(p) == p->nLevelRoot ) + return MSAT_FALSE; + + // perform conflict analysis + Msat_SolverAnalyze( p, pConf, p->vTemp, &nLevelBack ); + Msat_SolverCancelUntil( p, (p->nLevelRoot > nLevelBack)? p->nLevelRoot : nLevelBack ); + Msat_SolverRecord( p, p->vTemp ); + + // it is important that recording is done after cancelling + // because canceling cleans the queue while recording adds to it + Msat_SolverVarDecayActivity( p ); + Msat_SolverClaDecayActivity( p ); + + } + else{ + // NO CONFLICT + if ( Msat_IntVecReadSize(p->vTrailLim) == 0 ) { + // Simplify the set of problem clauses: +// Value = Msat_SolverSimplifyDB(p); +// assert( Value ); + } + nAssigns = Msat_IntVecReadSize( p->vTrail ); + if ( nLearnedLimit >= 0 && Msat_ClauseVecReadSize(p->vLearned) >= nLearnedLimit + nAssigns ) { + // Reduce the set of learnt clauses: + Msat_SolverReduceDB(p); + } + + Var = Msat_OrderVarSelect( p->pOrder ); + if ( Var == MSAT_ORDER_UNKNOWN ) { + // Model found and stored in p->pAssigns + memcpy( p->pModel, p->pAssigns, sizeof(int) * p->nVars ); + Msat_QueueClear( p->pQueue ); + Msat_SolverCancelUntil( p, p->nLevelRoot ); + return MSAT_TRUE; + } + if ( nConfLimit > 0 && nConfs > nConfLimit ) { + // Reached bound on number of conflicts: + p->dProgress = Msat_SolverProgressEstimate( p ); + Msat_QueueClear( p->pQueue ); + Msat_SolverCancelUntil( p, p->nLevelRoot ); + return MSAT_UNKNOWN; + } + else if ( nBackTrackLimit > 0 && (int)p->Stats.nConflicts - p->nBackTracks > nBackTrackLimit ) { + // Reached bound on number of conflicts: + Msat_QueueClear( p->pQueue ); + Msat_SolverCancelUntil( p, p->nLevelRoot ); + return MSAT_UNKNOWN; + } + else{ + // New variable decision: + p->Stats.nDecisions++; + assert( Var != MSAT_ORDER_UNKNOWN && Var >= 0 && Var < p->nVars ); + Value = Msat_SolverAssume(p, MSAT_VAR2LIT(Var,0) ); + assert( Value ); + } + } + } +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatSort.c b/src/sat/msat/msatSort.c new file mode 100644 index 00000000..3b89d102 --- /dev/null +++ b/src/sat/msat/msatSort.c @@ -0,0 +1,173 @@ +/**CFile**************************************************************** + + FileName [msatSort.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Sorting clauses.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatSort.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static int Msat_SolverSortCompare( Msat_Clause_t ** ppC1, Msat_Clause_t ** ppC2 ); + +// Returns a random float 0 <= x < 1. Seed must never be 0. +static double drand(double seed) { + int q; + seed *= 1389796; + q = (int)(seed / 2147483647); + seed -= (double)q * 2147483647; + return seed / 2147483647; } + +// Returns a random integer 0 <= x < size. Seed must never be 0. +static int irand(double seed, int size) { + return (int)(drand(seed) * size); } + +static void Msat_SolverSort( Msat_Clause_t ** array, int size, double seed ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Msat_SolverSort the learned clauses in the increasing order of activity.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverSortDB( Msat_Solver_t * p ) +{ + Msat_ClauseVec_t * pVecClauses; + Msat_Clause_t ** pLearned; + int nLearned; + // read the parameters + pVecClauses = Msat_SolverReadLearned( p ); + nLearned = Msat_ClauseVecReadSize( pVecClauses ); + pLearned = Msat_ClauseVecReadArray( pVecClauses ); + // Msat_SolverSort the array +// qMsat_SolverSort( (void *)pLearned, nLearned, sizeof(Msat_Clause_t *), +// (int (*)(const void *, const void *)) Msat_SolverSortCompare ); +// printf( "Msat_SolverSorting.\n" ); + Msat_SolverSort( pLearned, nLearned, 91648253 ); +/* + if ( nLearned > 2 ) + { + printf( "Clause 1: %0.20f\n", Msat_ClauseReadActivity(pLearned[0]) ); + printf( "Clause 2: %0.20f\n", Msat_ClauseReadActivity(pLearned[1]) ); + printf( "Clause 3: %0.20f\n", Msat_ClauseReadActivity(pLearned[2]) ); + } +*/ +} + +/**Function************************************************************* + + Synopsis [Comparison procedure for two clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_SolverSortCompare( Msat_Clause_t ** ppC1, Msat_Clause_t ** ppC2 ) +{ + float Value1 = Msat_ClauseReadActivity( *ppC1 ); + float Value2 = Msat_ClauseReadActivity( *ppC2 ); + if ( Value1 < Value2 ) + return -1; + if ( Value1 > Value2 ) + return 1; + return 0; +} + + +/**Function************************************************************* + + Synopsis [Selection sort for small array size.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverSortSelection( Msat_Clause_t ** array, int size ) +{ + Msat_Clause_t * tmp; + int i, j, best_i; + for ( i = 0; i < size-1; i++ ) + { + best_i = i; + for (j = i+1; j < size; j++) + { + if ( Msat_ClauseReadActivity(array[j]) < Msat_ClauseReadActivity(array[best_i]) ) + best_i = j; + } + tmp = array[i]; array[i] = array[best_i]; array[best_i] = tmp; + } +} + +/**Function************************************************************* + + Synopsis [The original MiniSat sorting procedure.] + + Description [This procedure is used to preserve trace-equivalence + with the orignal C++ implemenation of the solver.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_SolverSort( Msat_Clause_t ** array, int size, double seed ) +{ + if (size <= 15) + Msat_SolverSortSelection( array, size ); + else + { + Msat_Clause_t * pivot = array[irand(seed, size)]; + Msat_Clause_t * tmp; + int i = -1; + int j = size; + + for(;;) + { + do i++; while( Msat_ClauseReadActivity(array[i]) < Msat_ClauseReadActivity(pivot) ); + do j--; while( Msat_ClauseReadActivity(pivot) < Msat_ClauseReadActivity(array[j]) ); + + if ( i >= j ) break; + + tmp = array[i]; array[i] = array[j]; array[j] = tmp; + } + Msat_SolverSort(array , i , seed); + Msat_SolverSort(&array[i], size-i, seed); + } +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/msat/msatVec.c b/src/sat/msat/msatVec.c new file mode 100644 index 00000000..75f53047 --- /dev/null +++ b/src/sat/msat/msatVec.c @@ -0,0 +1,495 @@ +/**CFile**************************************************************** + + FileName [msatVec.c] + + PackageName [A C version of SAT solver MINISAT, originally developed + in C++ by Niklas Een and Niklas Sorensson, Chalmers University of + Technology, Sweden: http://www.cs.chalmers.se/~een/Satzoo.] + + Synopsis [Integer vector borrowed from Extra.] + + Author [Alan Mishchenko <alanmi@eecs.berkeley.edu>] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - January 1, 2004.] + + Revision [$Id: msatVec.c,v 1.0 2004/01/01 1:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "msatInt.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static int Msat_IntVecSortCompare1( int * pp1, int * pp2 ); +static int Msat_IntVecSortCompare2( int * pp1, int * pp2 ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocates a vector with the given capacity.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_IntVec_t * Msat_IntVecAlloc( int nCap ) +{ + Msat_IntVec_t * p; + p = ALLOC( Msat_IntVec_t, 1 ); + if ( nCap > 0 && nCap < 16 ) + nCap = 16; + p->nSize = 0; + p->nCap = nCap; + p->pArray = p->nCap? ALLOC( int, p->nCap ) : NULL; + return p; +} + +/**Function************************************************************* + + Synopsis [Creates the vector from an integer array of the given size.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_IntVec_t * Msat_IntVecAllocArray( int * pArray, int nSize ) +{ + Msat_IntVec_t * p; + p = ALLOC( Msat_IntVec_t, 1 ); + p->nSize = nSize; + p->nCap = nSize; + p->pArray = pArray; + return p; +} + +/**Function************************************************************* + + Synopsis [Creates the vector from an integer array of the given size.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_IntVec_t * Msat_IntVecAllocArrayCopy( int * pArray, int nSize ) +{ + Msat_IntVec_t * p; + p = ALLOC( Msat_IntVec_t, 1 ); + p->nSize = nSize; + p->nCap = nSize; + p->pArray = ALLOC( int, nSize ); + memcpy( p->pArray, pArray, sizeof(int) * nSize ); + return p; +} + +/**Function************************************************************* + + Synopsis [Duplicates the integer array.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_IntVec_t * Msat_IntVecDup( Msat_IntVec_t * pVec ) +{ + Msat_IntVec_t * p; + p = ALLOC( Msat_IntVec_t, 1 ); + p->nSize = pVec->nSize; + p->nCap = pVec->nCap; + p->pArray = p->nCap? ALLOC( int, p->nCap ) : NULL; + memcpy( p->pArray, pVec->pArray, sizeof(int) * pVec->nSize ); + return p; +} + +/**Function************************************************************* + + Synopsis [Transfers the array into another vector.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Msat_IntVec_t * Msat_IntVecDupArray( Msat_IntVec_t * pVec ) +{ + Msat_IntVec_t * p; + p = ALLOC( Msat_IntVec_t, 1 ); + p->nSize = pVec->nSize; + p->nCap = pVec->nCap; + p->pArray = pVec->pArray; + pVec->nSize = 0; + pVec->nCap = 0; + pVec->pArray = NULL; + return p; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecFree( Msat_IntVec_t * p ) +{ + FREE( p->pArray ); + FREE( p ); +} + +/**Function************************************************************* + + Synopsis [Fills the vector with given number of entries.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecFill( Msat_IntVec_t * p, int nSize, int Entry ) +{ + int i; + Msat_IntVecGrow( p, nSize ); + p->nSize = nSize; + for ( i = 0; i < p->nSize; i++ ) + p->pArray[i] = Entry; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int * Msat_IntVecReleaseArray( Msat_IntVec_t * p ) +{ + int * pArray = p->pArray; + p->nCap = 0; + p->nSize = 0; + p->pArray = NULL; + return pArray; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int * Msat_IntVecReadArray( Msat_IntVec_t * p ) +{ + return p->pArray; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_IntVecReadSize( Msat_IntVec_t * p ) +{ + return p->nSize; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_IntVecReadEntry( Msat_IntVec_t * p, int i ) +{ + assert( i >= 0 && i < p->nSize ); + return p->pArray[i]; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecWriteEntry( Msat_IntVec_t * p, int i, int Entry ) +{ + assert( i >= 0 && i < p->nSize ); + p->pArray[i] = Entry; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_IntVecReadEntryLast( Msat_IntVec_t * p ) +{ + return p->pArray[p->nSize-1]; +} + +/**Function************************************************************* + + Synopsis [Resizes the vector to the given capacity.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecGrow( Msat_IntVec_t * p, int nCapMin ) +{ + if ( p->nCap >= nCapMin ) + return; + p->pArray = REALLOC( int, p->pArray, nCapMin ); + p->nCap = nCapMin; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecShrink( Msat_IntVec_t * p, int nSizeNew ) +{ + assert( p->nSize >= nSizeNew ); + p->nSize = nSizeNew; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecClear( Msat_IntVec_t * p ) +{ + p->nSize = 0; +} + +/**Function************************************************************* + + Synopsis [] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecPush( Msat_IntVec_t * p, int Entry ) +{ + if ( p->nSize == p->nCap ) + { + if ( p->nCap < 16 ) + Msat_IntVecGrow( p, 16 ); + else + Msat_IntVecGrow( p, 2 * p->nCap ); + } + p->pArray[p->nSize++] = Entry; +} + +/**Function************************************************************* + + Synopsis [Add the element while ensuring uniqueness.] + + Description [Returns 1 if the element was found, and 0 if it was new. ] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_IntVecPushUnique( Msat_IntVec_t * p, int Entry ) +{ + int i; + for ( i = 0; i < p->nSize; i++ ) + if ( p->pArray[i] == Entry ) + return 1; + Msat_IntVecPush( p, Entry ); + return 0; +} + +/**Function************************************************************* + + Synopsis [Inserts the element while sorting in the increasing order.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecPushUniqueOrder( Msat_IntVec_t * p, int Entry, int fIncrease ) +{ + int Entry1, Entry2; + int i; + Msat_IntVecPushUnique( p, Entry ); + // find the p of the node + for ( i = p->nSize-1; i > 0; i-- ) + { + Entry1 = p->pArray[i ]; + Entry2 = p->pArray[i-1]; + if ( fIncrease && Entry1 >= Entry2 || + !fIncrease && Entry1 <= Entry2 ) + break; + p->pArray[i ] = Entry2; + p->pArray[i-1] = Entry1; + } +} + + +/**Function************************************************************* + + Synopsis [Returns the last entry and removes it from the list.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_IntVecPop( Msat_IntVec_t * p ) +{ + assert( p->nSize > 0 ); + return p->pArray[--p->nSize]; +} + +/**Function************************************************************* + + Synopsis [Sorting the entries by their integer value.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Msat_IntVecSort( Msat_IntVec_t * p, int fReverse ) +{ + if ( fReverse ) + qsort( (void *)p->pArray, p->nSize, sizeof(int), + (int (*)(const void *, const void *)) Msat_IntVecSortCompare2 ); + else + qsort( (void *)p->pArray, p->nSize, sizeof(int), + (int (*)(const void *, const void *)) Msat_IntVecSortCompare1 ); +} + +/**Function************************************************************* + + Synopsis [Comparison procedure for two clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_IntVecSortCompare1( int * pp1, int * pp2 ) +{ + // for some reason commenting out lines (as shown) led to crashing of the release version + if ( *pp1 < *pp2 ) + return -1; + if ( *pp1 > *pp2 ) // + return 1; + return 0; // +} + +/**Function************************************************************* + + Synopsis [Comparison procedure for two clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Msat_IntVecSortCompare2( int * pp1, int * pp2 ) +{ + // for some reason commenting out lines (as shown) led to crashing of the release version + if ( *pp1 > *pp2 ) + return -1; + if ( *pp1 < *pp2 ) // + return 1; + return 0; // +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/proof/pr.c b/src/sat/proof/pr.c new file mode 100644 index 00000000..2d1ab2d1 --- /dev/null +++ b/src/sat/proof/pr.c @@ -0,0 +1,1263 @@ +/**CFile**************************************************************** + + FileName [pr.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [Proof recording.] + + Synopsis [Core procedures of the package.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: pr.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> +#include <time.h> +//#include "vec.h" +#include "pr.h" + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +typedef unsigned lit; + +typedef struct Pr_Cls_t_ Pr_Cls_t; +struct Pr_Cls_t_ +{ + unsigned uTruth; // interpolant + void * pProof; // the proof node +// void * pAntis; // the anticedents + Pr_Cls_t * pNext; // the next clause + Pr_Cls_t * pNext0; // the next 0-watch + Pr_Cls_t * pNext1; // the next 0-watch + int Id; // the clause ID + unsigned fA : 1; // belongs to A + unsigned fRoot : 1; // original clause + unsigned fVisit : 1; // visited clause + unsigned nLits : 24; // the number of literals + lit pLits[0]; // literals of this clause +}; + +struct Pr_Man_t_ +{ + // general data + int fProofWrite; // writes the proof file + int fProofVerif; // verifies the proof + int nVars; // the number of variables + int nVarsAB; // the number of global variables + int nRoots; // the number of root clauses + int nClauses; // the number of all clauses + int nClausesA; // the number of clauses of A + Pr_Cls_t * pHead; // the head clause + Pr_Cls_t * pTail; // the tail clause + Pr_Cls_t * pLearnt; // the tail clause + Pr_Cls_t * pEmpty; // the empty clause + // internal BCP + int nRootSize; // the number of root level assignments + int nTrailSize; // the number of assignments made + lit * pTrail; // chronological order of assignments (size nVars) + lit * pAssigns; // assignments by variable (size nVars) + char * pSeens; // temporary mark (size nVars) + char * pVarTypes; // variable type (size nVars) [1=A, 0=B, <0=AB] + Pr_Cls_t ** pReasons; // reasons for each assignment (size nVars) + Pr_Cls_t ** pWatches; // watched clauses for each literal (size 2*nVars) + int nVarsAlloc; // the allocated size of arrays + // proof recording + void * pManProof; // proof manager + int Counter; // counter of resolved clauses + // memory management + int nChunkSize; // the number of bytes in a chunk + int nChunkUsed; // the number of bytes used in the last chunk + char * pChunkLast; // the last memory chunk + // internal verification + lit * pResLits; // the literals of the resolvent + int nResLits; // the number of literals of the resolvent + int nResLitsAlloc;// the number of literals of the resolvent + // runtime stats + int timeBcp; + int timeTrace; + int timeRead; + int timeTotal; +}; + +#ifndef PRT +#define PRT(a,t) printf("%s = ", (a)); printf("%6.2f sec\n", (float)(t)/(float)(CLOCKS_PER_SEC)) +#endif + +// variable assignments +static const lit LIT_UNDEF = 0xffffffff; + +// variable/literal conversions (taken from MiniSat) +static inline lit toLit (int v) { return v + v; } +static inline lit toLitCond(int v, int c) { return v + v + (c != 0); } +static inline lit lit_neg (lit l) { return l ^ 1; } +static inline int lit_var (lit l) { return l >> 1; } +static inline int lit_sign (lit l) { return l & 1; } +static inline int lit_print(lit l) { return lit_sign(l)? -lit_var(l)-1 : lit_var(l)+1; } +static inline lit lit_read (int s) { return s > 0 ? toLit(s-1) : lit_neg(toLit(-s-1)); } +static inline int lit_check(lit l, int n) { return l >= 0 && lit_var(l) < n; } + +// iterators through the clauses +#define Pr_ManForEachClause( p, pCls ) for( pCls = p->pHead; pCls; pCls = pCls->pNext ) +#define Pr_ManForEachClauseRoot( p, pCls ) for( pCls = p->pHead; pCls != p->pLearnt; pCls = pCls->pNext ) +#define Pr_ManForEachClauseLearnt( p, pCls ) for( pCls = p->pLearnt; pCls; pCls = pCls->pNext ) + +// static procedures +static char * Pr_ManMemoryFetch( Pr_Man_t * p, int nBytes ); +static void Pr_ManMemoryStop( Pr_Man_t * p ); +static void Pr_ManResize( Pr_Man_t * p, int nVarsNew ); + +// exported procedures +extern Pr_Man_t * Pr_ManAlloc( int nVarsAlloc ); +extern void Pr_ManFree( Pr_Man_t * p ); +extern int Pr_ManAddClause( Pr_Man_t * p, lit * pBeg, lit * pEnd, int fRoot, int fClauseA ); +extern int Pr_ManProofWrite( Pr_Man_t * p ); + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Allocate proof manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Pr_Man_t * Pr_ManAlloc( int nVarsAlloc ) +{ + Pr_Man_t * p; + // allocate the manager + p = (Pr_Man_t *)malloc( sizeof(Pr_Man_t) ); + memset( p, 0, sizeof(Pr_Man_t) ); + // allocate internal arrays + Pr_ManResize( p, nVarsAlloc? nVarsAlloc : 256 ); + // set the starting number of variables + p->nVars = 0; + // memory management + p->nChunkSize = (1<<16); // use 64K chunks + // verification + p->nResLitsAlloc = (1<<16); + p->pResLits = malloc( sizeof(lit) * p->nResLitsAlloc ); + // parameters + p->fProofWrite = 0; + p->fProofVerif = 0; + return p; +} + +/**Function************************************************************* + + Synopsis [Resize proof manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Pr_ManResize( Pr_Man_t * p, int nVarsNew ) +{ + // check if resizing is needed + if ( p->nVarsAlloc < nVarsNew ) + { + int nVarsAllocOld = p->nVarsAlloc; + // find the new size + if ( p->nVarsAlloc == 0 ) + p->nVarsAlloc = 1; + while ( p->nVarsAlloc < nVarsNew ) + p->nVarsAlloc *= 2; + // resize the arrays + p->pTrail = (lit *) realloc( p->pTrail, sizeof(lit) * p->nVarsAlloc ); + p->pAssigns = (lit *) realloc( p->pAssigns, sizeof(lit) * p->nVarsAlloc ); + p->pSeens = (char *) realloc( p->pSeens, sizeof(char) * p->nVarsAlloc ); + p->pVarTypes = (char *) realloc( p->pVarTypes, sizeof(char) * p->nVarsAlloc ); + p->pReasons = (Pr_Cls_t **)realloc( p->pReasons, sizeof(Pr_Cls_t *) * p->nVarsAlloc ); + p->pWatches = (Pr_Cls_t **)realloc( p->pWatches, sizeof(Pr_Cls_t *) * p->nVarsAlloc*2 ); + // clean the free space + memset( p->pAssigns + nVarsAllocOld, 0xff, sizeof(lit) * (p->nVarsAlloc - nVarsAllocOld) ); + memset( p->pSeens + nVarsAllocOld, 0, sizeof(char) * (p->nVarsAlloc - nVarsAllocOld) ); + memset( p->pVarTypes + nVarsAllocOld, 0, sizeof(char) * (p->nVarsAlloc - nVarsAllocOld) ); + memset( p->pReasons + nVarsAllocOld, 0, sizeof(Pr_Cls_t *) * (p->nVarsAlloc - nVarsAllocOld) ); + memset( p->pWatches + nVarsAllocOld, 0, sizeof(Pr_Cls_t *) * (p->nVarsAlloc - nVarsAllocOld)*2 ); + } + // adjust the number of variables + if ( p->nVars < nVarsNew ) + p->nVars = nVarsNew; +} + +/**Function************************************************************* + + Synopsis [Deallocate proof manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Pr_ManFree( Pr_Man_t * p ) +{ + printf( "Runtime stats:\n" ); +PRT( "Reading ", p->timeRead ); +PRT( "BCP ", p->timeBcp ); +PRT( "Trace ", p->timeTrace ); +PRT( "TOTAL ", p->timeTotal ); + + Pr_ManMemoryStop( p ); + free( p->pTrail ); + free( p->pAssigns ); + free( p->pSeens ); + free( p->pVarTypes ); + free( p->pReasons ); + free( p->pWatches ); + free( p->pResLits ); + free( p ); +} + +/**Function************************************************************* + + Synopsis [Adds one clause to the watcher list.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline void Pr_ManWatchClause( Pr_Man_t * p, Pr_Cls_t * pClause, lit Lit ) +{ + assert( lit_check(Lit, p->nVars) ); + if ( pClause->pLits[0] == Lit ) + pClause->pNext0 = p->pWatches[lit_neg(Lit)]; + else + { + assert( pClause->pLits[1] == Lit ); + pClause->pNext1 = p->pWatches[lit_neg(Lit)]; + } + p->pWatches[lit_neg(Lit)] = pClause; +} + +/**Function************************************************************* + + Synopsis [Adds one clause to the manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Pr_ManAddClause( Pr_Man_t * p, lit * pBeg, lit * pEnd, int fRoot, int fClauseA ) +{ + Pr_Cls_t * pClause; + lit Lit, * i, * j; + int nSize, VarMax; + + // process the literals + if ( pBeg < pEnd ) + { + // insertion sort + VarMax = lit_var( *pBeg ); + for ( i = pBeg + 1; i < pEnd; i++ ) + { + Lit = *i; + VarMax = lit_var(Lit) > VarMax ? lit_var(Lit) : VarMax; + for ( j = i; j > pBeg && *(j-1) > Lit; j-- ) + *j = *(j-1); + *j = Lit; + } + // make sure there is no duplicated variables + for ( i = pBeg + 1; i < pEnd; i++ ) + assert( lit_var(*(i-1)) != lit_var(*i) ); + // resize the manager + Pr_ManResize( p, VarMax+1 ); + } + + // get memory for the clause + nSize = sizeof(Pr_Cls_t) + sizeof(lit) * (pEnd - pBeg); + pClause = (Pr_Cls_t *)Pr_ManMemoryFetch( p, nSize ); + memset( pClause, 0, sizeof(Pr_Cls_t) ); + + // assign the clause + assert( !fClauseA || fRoot ); // clause of A is always a root clause + p->nRoots += fRoot; + p->nClausesA += fClauseA; + pClause->Id = p->nClauses++; + pClause->fA = fClauseA; + pClause->fRoot = fRoot; + pClause->nLits = pEnd - pBeg; + memcpy( pClause->pLits, pBeg, sizeof(lit) * (pEnd - pBeg) ); + + // add the clause to the list + if ( p->pHead == NULL ) + p->pHead = pClause; + if ( p->pTail == NULL ) + p->pTail = pClause; + else + { + p->pTail->pNext = pClause; + p->pTail = pClause; + } + + // mark the first learnt clause + if ( p->pLearnt == NULL && !pClause->fRoot ) + p->pLearnt = pClause; + + // add the empty clause + if ( pClause->nLits == 0 ) + { + if ( p->pEmpty ) + printf( "More than one empty clause!\n" ); + p->pEmpty = pClause; + } + return 1; +} + +/**Function************************************************************* + + Synopsis [Fetches memory.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +char * Pr_ManMemoryFetch( Pr_Man_t * p, int nBytes ) +{ + char * pMem; + if ( p->pChunkLast == NULL || nBytes > p->nChunkSize - p->nChunkUsed ) + { + pMem = (char *)malloc( p->nChunkSize ); + *(char **)pMem = p->pChunkLast; + p->pChunkLast = pMem; + p->nChunkUsed = sizeof(char *); + } + pMem = p->pChunkLast + p->nChunkUsed; + p->nChunkUsed += nBytes; + return pMem; +} + +/**Function************************************************************* + + Synopsis [Frees memory manager.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Pr_ManMemoryStop( Pr_Man_t * p ) +{ + char * pMem, * pNext; + if ( p->pChunkLast == NULL ) + return; + for ( pMem = p->pChunkLast; pNext = *(char **)pMem; pMem = pNext ) + free( pMem ); + free( pMem ); +} + +/**Function************************************************************* + + Synopsis [Reports memory usage in bytes.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Pr_ManMemoryReport( Pr_Man_t * p ) +{ + int Total; + char * pMem, * pNext; + if ( p->pChunkLast == NULL ) + return 0; + Total = p->nChunkUsed; + for ( pMem = p->pChunkLast; pNext = *(char **)pMem; pMem = pNext ) + Total += p->nChunkSize; + return Total; +} + +/**Function************************************************************* + + Synopsis [Records the proof.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Extra_PrintBinary_( FILE * pFile, unsigned Sign[], int nBits ) +{ + int Remainder, nWords; + int w, i; + + Remainder = (nBits%(sizeof(unsigned)*8)); + nWords = (nBits/(sizeof(unsigned)*8)) + (Remainder>0); + + for ( w = nWords-1; w >= 0; w-- ) + for ( i = ((w == nWords-1 && Remainder)? Remainder-1: 31); i >= 0; i-- ) + fprintf( pFile, "%c", '0' + (int)((Sign[w] & (1<<i)) > 0) ); +} + +/**Function************************************************************* + + Synopsis [Prints the interpolant for one clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Pr_ManPrintInterOne( Pr_Man_t * p, Pr_Cls_t * pClause ) +{ + printf( "Clause %2d : ", pClause->Id ); + Extra_PrintBinary_( stdout, &pClause->uTruth, (1 << p->nVarsAB) ); + printf( "\n" ); +} + + + +/**Function************************************************************* + + Synopsis [Records implication.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline int Pr_ManEnqueue( Pr_Man_t * p, lit Lit, Pr_Cls_t * pReason ) +{ + int Var = lit_var(Lit); + if ( p->pAssigns[Var] != LIT_UNDEF ) + return p->pAssigns[Var] == Lit; + p->pAssigns[Var] = Lit; + p->pReasons[Var] = pReason; + p->pTrail[p->nTrailSize++] = Lit; +//printf( "assigning var %d value %d\n", Var, !lit_sign(Lit) ); + return 1; +} + +/**Function************************************************************* + + Synopsis [Records implication.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline void Pr_ManCancelUntil( Pr_Man_t * p, int Level ) +{ + lit Lit; + int i, Var; + for ( i = p->nTrailSize - 1; i >= Level; i-- ) + { + Lit = p->pTrail[i]; + Var = lit_var( Lit ); + p->pReasons[Var] = NULL; + p->pAssigns[Var] = LIT_UNDEF; +//printf( "cancelling var %d\n", Var ); + } + p->nTrailSize = Level; +} + +/**Function************************************************************* + + Synopsis [Propagate one assignment.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +static inline Pr_Cls_t * Pr_ManPropagateOne( Pr_Man_t * p, lit Lit ) +{ + Pr_Cls_t ** ppPrev, * pCur, * pTemp; + lit LitF = lit_neg(Lit); + int i; + // iterate through the literals + ppPrev = p->pWatches + Lit; + for ( pCur = p->pWatches[Lit]; pCur; pCur = *ppPrev ) + { + // make sure the false literal is in the second literal of the clause + if ( pCur->pLits[0] == LitF ) + { + pCur->pLits[0] = pCur->pLits[1]; + pCur->pLits[1] = LitF; + pTemp = pCur->pNext0; + pCur->pNext0 = pCur->pNext1; + pCur->pNext1 = pTemp; + } + assert( pCur->pLits[1] == LitF ); + + // if the first literal is true, the clause is satisfied + if ( pCur->pLits[0] == p->pAssigns[lit_var(pCur->pLits[0])] ) + { + ppPrev = &pCur->pNext1; + continue; + } + + // look for a new literal to watch + for ( i = 2; i < (int)pCur->nLits; i++ ) + { + // skip the case when the literal is false + if ( lit_neg(pCur->pLits[i]) == p->pAssigns[lit_var(pCur->pLits[i])] ) + continue; + // the literal is either true or unassigned - watch it + pCur->pLits[1] = pCur->pLits[i]; + pCur->pLits[i] = LitF; + // remove this clause from the watch list of Lit + *ppPrev = pCur->pNext1; + // add this clause to the watch list of pCur->pLits[i] (now it is pCur->pLits[1]) + Pr_ManWatchClause( p, pCur, pCur->pLits[1] ); + break; + } + if ( i < (int)pCur->nLits ) // found new watch + continue; + + // clause is unit - enqueue new implication + if ( Pr_ManEnqueue(p, pCur->pLits[0], pCur) ) + { + ppPrev = &pCur->pNext1; + continue; + } + + // conflict detected - return the conflict clause + return pCur; + } + return NULL; +} + +/**Function************************************************************* + + Synopsis [Propagate the current assignments.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Pr_Cls_t * Pr_ManPropagate( Pr_Man_t * p, int Start ) +{ + Pr_Cls_t * pClause; + int i; + int clk = clock(); + for ( i = Start; i < p->nTrailSize; i++ ) + { + pClause = Pr_ManPropagateOne( p, p->pTrail[i] ); + if ( pClause ) + { +p->timeBcp += clock() - clk; + return pClause; + } + } +p->timeBcp += clock() - clk; + return NULL; +} + + +/**Function************************************************************* + + Synopsis [Prints the clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Pr_ManPrintClause( Pr_Cls_t * pClause ) +{ + int i; + printf( "Clause ID = %d. Proof = %d. {", pClause->Id, (int)pClause->pProof ); + for ( i = 0; i < (int)pClause->nLits; i++ ) + printf( " %d", pClause->pLits[i] ); + printf( " }\n" ); +} + +/**Function************************************************************* + + Synopsis [Prints the resolvent.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Pr_ManPrintResolvent( lit * pResLits, int nResLits ) +{ + int i; + printf( "Resolvent: {" ); + for ( i = 0; i < nResLits; i++ ) + printf( " %d", pResLits[i] ); + printf( " }\n" ); +} + +/**Function************************************************************* + + Synopsis [Writes one root clause into a file.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Pr_ManProofWriteOne( Pr_Man_t * p, Pr_Cls_t * pClause ) +{ + pClause->pProof = (void *)++p->Counter; + + if ( p->fProofWrite ) + { + int v; + fprintf( p->pManProof, "%d", (int)pClause->pProof ); + for ( v = 0; v < (int)pClause->nLits; v++ ) + fprintf( p->pManProof, " %d", lit_print(pClause->pLits[v]) ); + fprintf( p->pManProof, " 0 0\n" ); + } +} + +/**Function************************************************************* + + Synopsis [Traces the proof for one clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Pr_ManProofTraceOne( Pr_Man_t * p, Pr_Cls_t * pConflict, Pr_Cls_t * pFinal ) +{ + Pr_Cls_t * pReason; + int i, v, Var, PrevId; + int fPrint = 0; + int clk = clock(); + + // collect resolvent literals + if ( p->fProofVerif ) + { + assert( (int)pConflict->nLits <= p->nResLitsAlloc ); + memcpy( p->pResLits, pConflict->pLits, sizeof(lit) * pConflict->nLits ); + p->nResLits = pConflict->nLits; + } + + // mark all the variables in the conflict as seen + for ( v = 0; v < (int)pConflict->nLits; v++ ) + p->pSeens[lit_var(pConflict->pLits[v])] = 1; + + // start the anticedents +// pFinal->pAntis = Vec_PtrAlloc( 32 ); +// Vec_PtrPush( pFinal->pAntis, pConflict ); + + if ( p->nClausesA ) + pFinal->uTruth = pConflict->uTruth; + + // follow the trail backwards + PrevId = (int)pConflict->pProof; + for ( i = p->nTrailSize - 1; i >= 0; i-- ) + { + // skip literals that are not involved + Var = lit_var(p->pTrail[i]); + if ( !p->pSeens[Var] ) + continue; + p->pSeens[Var] = 0; + + // skip literals of the resulting clause + pReason = p->pReasons[Var]; + if ( pReason == NULL ) + continue; + assert( p->pTrail[i] == pReason->pLits[0] ); + + // add the variables to seen + for ( v = 1; v < (int)pReason->nLits; v++ ) + p->pSeens[lit_var(pReason->pLits[v])] = 1; + + + // record the reason clause + assert( pReason->pProof > 0 ); + p->Counter++; + if ( p->fProofWrite ) + fprintf( p->pManProof, "%d * %d %d 0\n", p->Counter, PrevId, (int)pReason->pProof ); + PrevId = p->Counter; + + if ( p->nClausesA ) + { + if ( p->pVarTypes[Var] == 1 ) // var of A + pFinal->uTruth |= pReason->uTruth; + else + pFinal->uTruth &= pReason->uTruth; + } + + // resolve the temporary resolvent with the reason clause + if ( p->fProofVerif ) + { + int v1, v2; + if ( fPrint ) + Pr_ManPrintResolvent( p->pResLits, p->nResLits ); + // check that the var is present in the resolvent + for ( v1 = 0; v1 < p->nResLits; v1++ ) + if ( lit_var(p->pResLits[v1]) == Var ) + break; + if ( v1 == p->nResLits ) + printf( "Recording clause %d: Cannot find variable %d in the temporary resolvent.\n", pFinal->Id, Var ); + if ( p->pResLits[v1] != lit_neg(pReason->pLits[0]) ) + printf( "Recording clause %d: The resolved variable %d is in the wrong polarity.\n", pFinal->Id, Var ); + // remove this variable from the resolvent + assert( lit_var(p->pResLits[v1]) == Var ); + p->nResLits--; + for ( ; v1 < p->nResLits; v1++ ) + p->pResLits[v1] = p->pResLits[v1+1]; + // add variables of the reason clause + for ( v2 = 1; v2 < (int)pReason->nLits; v2++ ) + { + for ( v1 = 0; v1 < p->nResLits; v1++ ) + if ( lit_var(p->pResLits[v1]) == lit_var(pReason->pLits[v2]) ) + break; + // if it is a new variable, add it to the resolvent + if ( v1 == p->nResLits ) + { + if ( p->nResLits == p->nResLitsAlloc ) + printf( "Recording clause %d: Ran out of space for intermediate resolvent.\n, pFinal->Id" ); + p->pResLits[ p->nResLits++ ] = pReason->pLits[v2]; + continue; + } + // if the variable is the same, the literal should be the same too + if ( p->pResLits[v1] == pReason->pLits[v2] ) + continue; + // the literal is different + printf( "Recording clause %d: Trying to resolve the clause with more than one opposite literal.\n", pFinal->Id ); + } + } + +// Vec_PtrPush( pFinal->pAntis, pReason ); + } + + // unmark all seen variables +// for ( i = p->nTrailSize - 1; i >= 0; i-- ) +// p->pSeens[lit_var(p->pTrail[i])] = 0; + // check that the literals are unmarked +// for ( i = p->nTrailSize - 1; i >= 0; i-- ) +// assert( p->pSeens[lit_var(p->pTrail[i])] == 0 ); + + // use the resulting clause to check the correctness of resolution + if ( p->fProofVerif ) + { + int v1, v2; + if ( fPrint ) + Pr_ManPrintResolvent( p->pResLits, p->nResLits ); + for ( v1 = 0; v1 < p->nResLits; v1++ ) + { + for ( v2 = 0; v2 < (int)pFinal->nLits; v2++ ) + if ( pFinal->pLits[v2] == p->pResLits[v1] ) + break; + if ( v2 < (int)pFinal->nLits ) + continue; + break; + } + if ( v1 < p->nResLits ) + { + printf( "Recording clause %d: The final resolvent is wrong.\n", pFinal->Id ); + Pr_ManPrintClause( pConflict ); + Pr_ManPrintResolvent( p->pResLits, p->nResLits ); + Pr_ManPrintClause( pFinal ); + } + } +p->timeTrace += clock() - clk; + + // return the proof pointer + if ( p->nClausesA ) + { + Pr_ManPrintInterOne( p, pFinal ); + } + return p->Counter; +} + +/**Function************************************************************* + + Synopsis [Records the proof for one clause.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Pr_ManProofRecordOne( Pr_Man_t * p, Pr_Cls_t * pClause ) +{ + Pr_Cls_t * pConflict; + int i; + + // empty clause never ends up there + assert( pClause->nLits > 0 ); + if ( pClause->nLits == 0 ) + printf( "Error: Empty clause is attempted.\n" ); + + // add assumptions to the trail + assert( !pClause->fRoot ); + assert( p->nTrailSize == p->nRootSize ); + for ( i = 0; i < (int)pClause->nLits; i++ ) + if ( !Pr_ManEnqueue( p, lit_neg(pClause->pLits[i]), NULL ) ) + { + assert( 0 ); // impossible + return 0; + } + + // propagate the assumptions + pConflict = Pr_ManPropagate( p, p->nRootSize ); + if ( pConflict == NULL ) + { + assert( 0 ); // cannot prove + return 0; + } + + // construct the proof + pClause->pProof = (void *)Pr_ManProofTraceOne( p, pConflict, pClause ); + + // undo to the root level + Pr_ManCancelUntil( p, p->nRootSize ); + + // add large clauses to the watched lists + if ( pClause->nLits > 1 ) + { + Pr_ManWatchClause( p, pClause, pClause->pLits[0] ); + Pr_ManWatchClause( p, pClause, pClause->pLits[1] ); + return 1; + } + assert( pClause->nLits == 1 ); + + // if the clause proved is unit, add it and propagate + if ( !Pr_ManEnqueue( p, pClause->pLits[0], pClause ) ) + { + assert( 0 ); // impossible + return 0; + } + + // propagate the assumption + pConflict = Pr_ManPropagate( p, p->nRootSize ); + if ( pConflict ) + { + // construct the proof + p->pEmpty->pProof = (void *)Pr_ManProofTraceOne( p, pConflict, p->pEmpty ); + printf( "Found last conflict after adding unit clause number %d!\n", pClause->Id ); + return 0; + } + + // update the root level + p->nRootSize = p->nTrailSize; + return 1; +} + +/**Function************************************************************* + + Synopsis [Propagate the root clauses.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Pr_ManProcessRoots( Pr_Man_t * p ) +{ + Pr_Cls_t * pClause; + int Counter; + + // make sure the root clauses are preceeding the learnt clauses + Counter = 0; + Pr_ManForEachClause( p, pClause ) + { + assert( (int)pClause->fA == (Counter < (int)p->nClausesA) ); + assert( (int)pClause->fRoot == (Counter < (int)p->nRoots) ); + Counter++; + } + assert( p->nClauses == Counter ); + + // make sure the last clause if empty + assert( p->pTail->nLits == 0 ); + + // go through the root unit clauses + p->nTrailSize = 0; + Pr_ManForEachClauseRoot( p, pClause ) + { + // create watcher lists for the root clauses + if ( pClause->nLits > 1 ) + { + Pr_ManWatchClause( p, pClause, pClause->pLits[0] ); + Pr_ManWatchClause( p, pClause, pClause->pLits[1] ); + } + // empty clause and large clauses + if ( pClause->nLits != 1 ) + continue; + // unit clause + assert( lit_check(pClause->pLits[0], p->nVars) ); + if ( !Pr_ManEnqueue( p, pClause->pLits[0], pClause ) ) + { + // detected root level conflict + printf( "Pr_ManProcessRoots(): Detected a root-level conflict\n" ); + assert( 0 ); + return 0; + } + } + + // propagate the root unit clauses + pClause = Pr_ManPropagate( p, 0 ); + if ( pClause ) + { + // detected root level conflict + printf( "Pr_ManProcessRoots(): Detected a root-level conflict\n" ); + assert( 0 ); + return 0; + } + + // set the root level + p->nRootSize = p->nTrailSize; + return 1; +} + +/**Function************************************************************* + + Synopsis [Records the proof.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Pr_ManPrepareInter( Pr_Man_t * p ) +{ + unsigned uTruths[5] = { 0xAAAAAAAA, 0xCCCCCCCC, 0xF0F0F0F0, 0xFF00FF00, 0xFFFF0000 }; + Pr_Cls_t * pClause; + int Var, v; + + // mark the variable encountered in the clauses of A + Pr_ManForEachClauseRoot( p, pClause ) + { + if ( !pClause->fA ) + break; + for ( v = 0; v < (int)pClause->nLits; v++ ) + p->pVarTypes[lit_var(pClause->pLits[v])] = 1; + } + + // check variables that appear in clauses of B + p->nVarsAB = 0; + Pr_ManForEachClauseRoot( p, pClause ) + { + if ( pClause->fA ) + continue; + for ( v = 0; v < (int)pClause->nLits; v++ ) + { + Var = lit_var(pClause->pLits[v]); + if ( p->pVarTypes[Var] == 1 ) // var of A + { + // change it into a global variable + p->nVarsAB++; + p->pVarTypes[Var] = -1; + } + } + } + + // order global variables + p->nVarsAB = 0; + for ( v = 0; v < p->nVars; v++ ) + if ( p->pVarTypes[v] == -1 ) + p->pVarTypes[v] -= p->nVarsAB++; +printf( "There are %d global variables.\n", p->nVarsAB ); + + // set interpolants for root clauses + Pr_ManForEachClauseRoot( p, pClause ) + { + if ( !pClause->fA ) // clause of B + { + pClause->uTruth = ~0; + Pr_ManPrintInterOne( p, pClause ); + continue; + } + // clause of A + pClause->uTruth = 0; + for ( v = 0; v < (int)pClause->nLits; v++ ) + { + Var = lit_var(pClause->pLits[v]); + if ( p->pVarTypes[Var] < 0 ) // global var + { + if ( lit_sign(pClause->pLits[v]) ) // negative var + pClause->uTruth |= ~uTruths[ -p->pVarTypes[Var]-1 ]; + else + pClause->uTruth |= uTruths[ -p->pVarTypes[Var]-1 ]; + } + } + Pr_ManPrintInterOne( p, pClause ); + } +} + +/**Function************************************************************* + + Synopsis [Records the proof.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Pr_ManProofWrite( Pr_Man_t * p ) +{ + Pr_Cls_t * pClause; + int RetValue = 1; + + // propagate root level assignments + Pr_ManProcessRoots( p ); + + // prepare the interpolant computation + if ( p->nClausesA ) + Pr_ManPrepareInter( p ); + + // construct proof for each clause + // start the proof + if ( p->fProofWrite ) + p->pManProof = fopen( "proof.cnf_", "w" ); + p->Counter = 0; + + // write the root clauses + Pr_ManForEachClauseRoot( p, pClause ) + Pr_ManProofWriteOne( p, pClause ); + + // consider each learned clause + Pr_ManForEachClauseLearnt( p, pClause ) + { + if ( !Pr_ManProofRecordOne( p, pClause ) ) + { + RetValue = 0; + break; + } + } + + if ( p->nClausesA ) + { + printf( "Interpolant: " ); + } + + + // stop the proof + if ( p->fProofWrite ) + { + fclose( p->pManProof ); + p->pManProof = NULL; + } + return RetValue; +} + +/**Function************************************************************* + + Synopsis [Reads clauses from file.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +Pr_Man_t * Pr_ManProofRead( char * pFileName ) +{ + Pr_Man_t * p = NULL; + char * pCur, * pBuffer = NULL; + int * pArray = NULL; + FILE * pFile; + int RetValue, Counter, nNumbers, Temp; + int nClauses, nClausesA, nRoots, nVars; + + // open the file + pFile = fopen( pFileName, "r" ); + if ( pFile == NULL ) + { + printf( "Count not open input file \"%s\".\n", pFileName ); + return NULL; + } + + // read the file + pBuffer = (char *)malloc( (1<<16) ); + for ( Counter = 0; fgets( pBuffer, (1<<16), pFile ); ) + { + if ( pBuffer[0] == 'c' ) + continue; + if ( pBuffer[0] == 'p' ) + { + assert( p == NULL ); + nClausesA = 0; + RetValue = sscanf( pBuffer + 1, "%d %d %d %d", &nVars, &nClauses, &nRoots, &nClausesA ); + if ( RetValue != 3 && RetValue != 4 ) + { + printf( "Wrong input file format.\n" ); + } + p = Pr_ManAlloc( nVars ); + pArray = (int *)malloc( sizeof(int) * (nVars + 10) ); + continue; + } + // skip empty lines + for ( pCur = pBuffer; *pCur; pCur++ ) + if ( !(*pCur == ' ' || *pCur == '\t' || *pCur == '\r' || *pCur == '\n') ) + break; + if ( *pCur == 0 ) + continue; + // scan the numbers from file + nNumbers = 0; + pCur = pBuffer; + while ( *pCur ) + { + // skip spaces + for ( ; *pCur && *pCur == ' '; pCur++ ); + // read next number + Temp = 0; + sscanf( pCur, "%d", &Temp ); + if ( Temp == 0 ) + break; + pArray[ nNumbers++ ] = lit_read( Temp ); + // skip non-spaces + for ( ; *pCur && *pCur != ' '; pCur++ ); + } + // add the clause + if ( !Pr_ManAddClause( p, pArray, pArray + nNumbers, Counter < nRoots, Counter < nClausesA ) ) + { + printf( "Bad clause number %d.\n", Counter ); + return NULL; + } + // count the clauses + Counter++; + } + // check the number of clauses + if ( Counter != nClauses ) + printf( "Expected %d clauses but read %d.\n", nClauses, Counter ); + + // finish + if ( pArray ) free( pArray ); + if ( pBuffer ) free( pBuffer ); + fclose( pFile ); + return p; +} + +/**Function************************************************************* + + Synopsis [Records the proof.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +/* +int Pr_ManProofCount_rec( Pr_Cls_t * pClause ) +{ + Pr_Cls_t * pNext; + int i, Counter; + if ( pClause->fRoot ) + return 0; + if ( pClause->fVisit ) + return 0; + pClause->fVisit = 1; + // count the number of visited clauses + Counter = 1; + Vec_PtrForEachEntry( pClause->pAntis, pNext, i ) + Counter += Pr_ManProofCount_rec( pNext ); + return Counter; +} +*/ + +/**Function************************************************************* + + Synopsis [Records the proof.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Pr_ManProofTest( char * pFileName ) +{ + Pr_Man_t * p; + int clk, clkTotal = clock(); + +clk = clock(); + p = Pr_ManProofRead( pFileName ); +p->timeRead = clock() - clk; + if ( p == NULL ) + return 0; + + Pr_ManProofWrite( p ); + + // print stats +/* + nUsed = Pr_ManProofCount_rec( p->pEmpty ); + printf( "Roots = %d. Learned = %d. Total = %d. Steps = %d. Ave = %.2f. Used = %d. Ratio = %.2f. \n", + p->nRoots, p->nClauses-p->nRoots, p->nClauses, p->Counter, + 1.0*(p->Counter-p->nRoots)/(p->nClauses-p->nRoots), + nUsed, 1.0*nUsed/(p->nClauses-p->nRoots) ); +*/ + printf( "Vars = %d. Roots = %d. Learned = %d. Resol steps = %d. Ave = %.2f. Mem = %.2f Mb\n", + p->nVars, p->nRoots, p->nClauses-p->nRoots, p->Counter, + 1.0*(p->Counter-p->nRoots)/(p->nClauses-p->nRoots), + 1.0*Pr_ManMemoryReport(p)/(1<<20) ); + +p->timeTotal = clock() - clkTotal; + Pr_ManFree( p ); + return 1; +} + + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + diff --git a/src/sat/proof/pr.h b/src/sat/proof/pr.h new file mode 100644 index 00000000..1e71a2d3 --- /dev/null +++ b/src/sat/proof/pr.h @@ -0,0 +1,65 @@ +/**CFile**************************************************************** + + FileName [pr.h] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [Proof recording.] + + Synopsis [External declarations.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: pr.h,v 1.00 2005/06/20 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#ifndef __PR_H__ +#define __PR_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef _WIN32 +#define inline __inline // compatible with MS VS 6.0 +#endif + +//////////////////////////////////////////////////////////////////////// +/// INCLUDES /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// PARAMETERS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// BASIC TYPES /// +//////////////////////////////////////////////////////////////////////// + +typedef struct Pr_Man_t_ Pr_Man_t; + +//////////////////////////////////////////////////////////////////////// +/// MACRO DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +/*=== pr.c ==========================================================*/ + +#ifdef __cplusplus +} +#endif + +#endif + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + diff --git a/src/sat/proof/stats.txt b/src/sat/proof/stats.txt new file mode 100644 index 00000000..470b1630 --- /dev/null +++ b/src/sat/proof/stats.txt @@ -0,0 +1,66 @@ +UC Berkeley, ABC 1.01 (compiled Jan 20 2007 16:47:34) +abc.rc: No such file or directory +Loaded "abc.rc" from the parent directory. +abc 01> test +Found last conflict after adding unit clause number 10229! +Roots = 7184. Learned = 3047. Total = 10231. Steps = 196361. Ave = 62.09. Used = 2224. Ratio = 0.73. +Runtime stats: +Reading = 0.03 sec +BCP = 0.32 sec +Trace = 0.06 sec +TOTAL = 0.43 sec +abc 01> test +Found last conflict after adding unit clause number 7676! +Roots = 6605. Learned = 1073. Total = 7678. Steps = 52402. Ave = 42.68. Used = 1011. Ratio = 0.94. +Runtime stats: +Reading = 0.01 sec +BCP = 0.02 sec +Trace = 0.02 sec +TOTAL = 0.06 sec +abc 01> test +Found last conflict after adding unit clause number 37868! +Roots = 15443. Learned = 22427. Total = 37870. Steps = 2365472. Ave = 104.79. Used = 19763. Ratio = 0.88. +Runtime stats: +Reading = 0.20 sec +BCP = 14.67 sec +Trace = 0.56 sec +TOTAL = 15.74 sec +abc 01> + + +abc 05> wb ibm_bmc/len25u_renc.blif +abc 05> ps +(no name) : i/o = 348/ 1 lat = 0 nd = 3648 bdd = 15522 lev = 246 +abc 05> sat -v +==================================[MINISAT]=================================== +| Conflicts | ORIGINAL | LEARNT | Progress | +| | Clauses Literals | Limit Clauses Literals Lit/Cl | | +============================================================================== +| 0 | 17413 54996 | 5804 0 0 0.0 | 0.000 % | +| 100 | 17413 54996 | 6384 100 606 6.1 | 0.417 % | +| 250 | 17413 54996 | 7023 250 1586 6.3 | 0.417 % | +| 476 | 17413 54996 | 7725 476 3288 6.9 | 0.417 % | +| 813 | 17413 54996 | 8498 813 7586 9.3 | 0.417 % | +| 1319 | 17403 54970 | 9347 1318 14848 11.3 | 0.442 % | +| 2078 | 17403 54970 | 10282 2076 40186 19.4 | 0.466 % | +| 3217 | 17397 54948 | 11310 3208 99402 31.0 | 0.466 % | +| 4926 | 17392 54930 | 12441 4911 131848 26.8 | 0.491 % | +| 7489 | 17392 54930 | 13686 7474 204217 27.3 | 0.491 % | +| 11336 | 17357 54829 | 15054 11310 332863 29.4 | 0.638 % | +| 17103 | 17346 54794 | 16559 9130 203029 22.2 | 0.687 % | +| 25752 | 17288 54606 | 18215 9083 176982 19.5 | 0.834 % | +| 38727 | 17266 54536 | 20037 12674 278949 22.0 | 0.883 % | +| 58188 | 17240 54453 | 22041 11905 255255 21.4 | 0.957 % | +============================================================================== +Start = 15. Conf = 79435. Dec = 130967. Prop = 24083434. Insp = 136774586. +Total runtime = 18.66 sec. Var select = 0.00 sec. Var update = 0.00 sec. +UNSATISFIABLE Time = 18.69 sec +abc 05> +abc 05> test +Found last conflict after adding unit clause number 96902! +Roots = 17469. Learned = 79435. Total = 96904. Steps = 9700042. Ave = 121.89. Used = 57072. Ratio = 0.72. +Runtime stats: +Reading = 1.26 sec +BCP = 204.99 sec +Trace = 2.85 sec +TOTAL = 209.85 sec
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