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/**CFile****************************************************************
FileName [pdrCnf.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Property driven reachability.]
Synopsis [CNF computation on demand.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - November 20, 2010.]
Revision [$Id: pdrCnf.c,v 1.00 2010/11/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "pdrInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
/*
The CNF (p->pCnf2) is expressed in terms of object IDs.
Each node in the CNF is marked if it has clauses (p->pCnf2->pObj2Count[Id] > 0).
Each node in the CNF has the first clause (p->pCnf2->pObj2Clause)
and the number of clauses (p->pCnf2->pObj2Count).
Each node used in a CNF of any timeframe has its SAT var recorded.
Each frame has a reserve mapping of SAT variables into ObjIds.
*/
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Returns SAT variable of the given object.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Pdr_ObjSatVar1( Pdr_Man_t * p, int k, Aig_Obj_t * pObj )
{
return p->pCnf1->pVarNums[ Aig_ObjId(pObj) ];
}
/**Function*************************************************************
Synopsis [Returns SAT variable of the given object.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Pdr_ObjSatVar2FindOrAdd( Pdr_Man_t * p, int k, Aig_Obj_t * pObj )
{
assert( p->pCnf2->pObj2Count[Aig_ObjId(pObj)] >= 0 );
if ( p->pvId2Vars[Aig_ObjId(pObj)] == NULL )
p->pvId2Vars[Aig_ObjId(pObj)] = Vec_IntStart( 16 );
if ( Vec_IntGetEntry( p->pvId2Vars[Aig_ObjId(pObj)], k ) == 0 )
{
sat_solver * pSat = Pdr_ManSolver(p, k);
Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry(p->vVar2Ids, k);
int iVarNew = Vec_IntSize( vVar2Ids );
assert( iVarNew > 0 );
Vec_IntPush( vVar2Ids, Aig_ObjId(pObj) );
Vec_IntWriteEntry( p->pvId2Vars[Aig_ObjId(pObj)], k, iVarNew );
sat_solver_setnvars( pSat, iVarNew + 1 );
if ( k == 0 && Saig_ObjIsLo(p->pAig, pObj) ) // initialize the register output
{
int Lit = toLitCond( iVarNew, 1 );
int RetValue = sat_solver_addclause( pSat, &Lit, &Lit + 1 );
assert( RetValue == 1 );
sat_solver_compress( pSat );
}
}
return Vec_IntEntry( p->pvId2Vars[Aig_ObjId(pObj)], k );
}
/**Function*************************************************************
Synopsis [Recursively adds CNF for the given object.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Pdr_ObjSatVar2( Pdr_Man_t * p, int k, Aig_Obj_t * pObj )
{
sat_solver * pSat;
Vec_Int_t * vLits;
Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry(p->vVar2Ids, k);
int nVarCount = Vec_IntSize(vVar2Ids);
int iVarThis = Pdr_ObjSatVar2FindOrAdd( p, k, pObj );
int * pLit, i, iVar, nClauses, iFirstClause, RetValue;
if ( nVarCount == Vec_IntSize(vVar2Ids) )
return iVarThis;
assert( nVarCount + 1 == Vec_IntSize(vVar2Ids) );
if ( Aig_ObjIsPi(pObj) )
return iVarThis;
nClauses = p->pCnf2->pObj2Count[Aig_ObjId(pObj)];
iFirstClause = p->pCnf2->pObj2Clause[Aig_ObjId(pObj)];
assert( nClauses > 0 );
pSat = Pdr_ManSolver(p, k);
vLits = Vec_IntAlloc( 16 );
for ( i = iFirstClause; i < iFirstClause + nClauses; i++ )
{
Vec_IntClear( vLits );
for ( pLit = p->pCnf2->pClauses[i]; pLit < p->pCnf2->pClauses[i+1]; pLit++ )
{
iVar = Pdr_ObjSatVar2( p, k, Aig_ManObj(p->pAig, lit_var(*pLit)) );
Vec_IntPush( vLits, toLitCond( iVar, lit_sign(*pLit) ) );
}
RetValue = sat_solver_addclause( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits)+Vec_IntSize(vLits) );
assert( RetValue );
}
Vec_IntFree( vLits );
return iVarThis;
}
/**Function*************************************************************
Synopsis [Returns SAT variable of the given object.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Pdr_ObjSatVar( Pdr_Man_t * p, int k, Aig_Obj_t * pObj )
{
if ( p->pPars->fMonoCnf )
return Pdr_ObjSatVar1( p, k, pObj );
else
return Pdr_ObjSatVar2( p, k, pObj );
}
/**Function*************************************************************
Synopsis [Returns register number for the given SAT variable.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Pdr_ObjRegNum1( Pdr_Man_t * p, int k, int iSatVar )
{
int RegId;
assert( iSatVar >= 0 );
// consider the case of auxiliary variable
if ( iSatVar >= p->pCnf1->nVars )
return -1;
// consider the case of register output
RegId = Vec_IntEntry( p->vVar2Reg, iSatVar );
assert( RegId >= 0 && RegId < Aig_ManRegNum(p->pAig) );
return RegId;
}
/**Function*************************************************************
Synopsis [Returns register number for the given SAT variable.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Pdr_ObjRegNum2( Pdr_Man_t * p, int k, int iSatVar )
{
Aig_Obj_t * pObj;
int ObjId;
Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry(p->vVar2Ids, k);
assert( iSatVar > 0 && iSatVar < Vec_IntSize(vVar2Ids) );
ObjId = Vec_IntEntry( vVar2Ids, iSatVar );
if ( ObjId == -1 ) // activation variable
return -1;
pObj = Aig_ManObj( p->pAig, ObjId );
if ( Saig_ObjIsLi( p->pAig, pObj ) )
return Aig_ObjPioNum(pObj)-Saig_ManPoNum(p->pAig);
assert( 0 ); // should be called for register inputs only
return -1;
}
/**Function*************************************************************
Synopsis [Returns register number for the given SAT variable.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Pdr_ObjRegNum( Pdr_Man_t * p, int k, int iSatVar )
{
if ( p->pPars->fMonoCnf )
return Pdr_ObjRegNum1( p, k, iSatVar );
else
return Pdr_ObjRegNum2( p, k, iSatVar );
}
/**Function*************************************************************
Synopsis [Returns the index of unused SAT variable.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Pdr_ManFreeVar( Pdr_Man_t * p, int k )
{
if ( p->pPars->fMonoCnf )
return sat_solver_nvars( Pdr_ManSolver(p, k) );
else
{
Vec_Int_t * vVar2Ids = (Vec_Int_t *)Vec_PtrEntry( p->vVar2Ids, k );
Vec_IntPush( vVar2Ids, -1 );
return Vec_IntSize( vVar2Ids ) - 1;
}
}
/**Function*************************************************************
Synopsis [Creates SAT solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline sat_solver * Pdr_ManNewSolver1( sat_solver * pSat, Pdr_Man_t * p, int k, int fInit )
{
Aig_Obj_t * pObj;
int i;
assert( pSat );
if ( p->pCnf1 == NULL )
{
int nRegs = p->pAig->nRegs;
p->pAig->nRegs = Aig_ManPoNum(p->pAig);
p->pCnf1 = Cnf_Derive( p->pAig, Aig_ManPoNum(p->pAig) );
p->pAig->nRegs = nRegs;
assert( p->vVar2Reg == NULL );
p->vVar2Reg = Vec_IntStartFull( p->pCnf1->nVars );
Saig_ManForEachLi( p->pAig, pObj, i )
Vec_IntWriteEntry( p->vVar2Reg, Pdr_ObjSatVar(p, k, pObj), i );
}
pSat = (sat_solver *)Cnf_DataWriteIntoSolverInt( pSat, p->pCnf1, 1, fInit );
sat_solver_set_runtime_limit( pSat, p->timeToStop );
return pSat;
}
/**Function*************************************************************
Synopsis [Creates SAT solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline sat_solver * Pdr_ManNewSolver2( sat_solver * pSat, Pdr_Man_t * p, int k, int fInit )
{
Vec_Int_t * vVar2Ids;
int i, Entry;
assert( pSat );
if ( p->pCnf2 == NULL )
{
p->pCnf2 = Cnf_DeriveOther( p->pAig );
p->pvId2Vars = ABC_CALLOC( Vec_Int_t *, Aig_ManObjNumMax(p->pAig) );
p->vVar2Ids = Vec_PtrAlloc( 256 );
}
// update the variable mapping
vVar2Ids = (Vec_Int_t *)Vec_PtrGetEntry( p->vVar2Ids, k );
if ( vVar2Ids == NULL )
{
vVar2Ids = Vec_IntAlloc( 500 );
Vec_PtrWriteEntry( p->vVar2Ids, k, vVar2Ids );
}
Vec_IntForEachEntry( vVar2Ids, Entry, i )
{
if ( Entry == -1 )
continue;
assert( Vec_IntEntry( p->pvId2Vars[Entry], k ) > 0 );
Vec_IntWriteEntry( p->pvId2Vars[Entry], k, 0 );
}
Vec_IntClear( vVar2Ids );
Vec_IntPush( vVar2Ids, -1 );
// start the SAT solver
// pSat = sat_solver_new();
sat_solver_setnvars( pSat, 500 );
sat_solver_set_runtime_limit( pSat, p->timeToStop );
return pSat;
}
/**Function*************************************************************
Synopsis [Creates SAT solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
sat_solver * Pdr_ManNewSolver( sat_solver * pSat, Pdr_Man_t * p, int k, int fInit )
{
assert( pSat != NULL );
if ( p->pPars->fMonoCnf )
return Pdr_ManNewSolver1( pSat, p, k, fInit );
else
return Pdr_ManNewSolver2( pSat, p, k, fInit );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
