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/**CFile****************************************************************
FileName [cecSat.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Combinatinoal equivalence checking.]
Synopsis [SAT solver calls.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: cecSat.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "cecInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Creates the manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cec_ManSat_t * Cec_ManCreate( Aig_Man_t * pAig, Cec_ParSat_t * pPars )
{
Cec_ManSat_t * p;
// create interpolation manager
p = ABC_ALLOC( Cec_ManSat_t, 1 );
memset( p, 0, sizeof(Cec_ManSat_t) );
p->pPars = pPars;
p->pAig = pAig;
// SAT solving
p->nSatVars = 1;
p->pSatVars = ABC_CALLOC( int, Aig_ManObjNumMax(pAig) );
p->vUsedNodes = Vec_PtrAlloc( 1000 );
p->vFanins = Vec_PtrAlloc( 100 );
return p;
}
/**Function*************************************************************
Synopsis [Frees the manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cec_ManStop( Cec_ManSat_t * p )
{
if ( p->pSat )
sat_solver_delete( p->pSat );
Vec_PtrFree( p->vUsedNodes );
Vec_PtrFree( p->vFanins );
ABC_FREE( p->pSatVars );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis [Recycles the SAT solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Cec_ManSatSolverRecycle( Cec_ManSat_t * p )
{
int Lit;
if ( p->pSat )
{
Aig_Obj_t * pObj;
int i;
Vec_PtrForEachEntry( p->vUsedNodes, pObj, i )
Cec_ObjSetSatNum( p, pObj, 0 );
Vec_PtrClear( p->vUsedNodes );
// memset( p->pSatVars, 0, sizeof(int) * Aig_ManObjNumMax(p->pAigTotal) );
sat_solver_delete( p->pSat );
}
p->pSat = sat_solver_new();
sat_solver_setnvars( p->pSat, 1000 );
// var 0 is not used
// var 1 is reserved for const1 node - add the clause
p->nSatVars = 1;
// p->nSatVars = 0;
Lit = toLit( p->nSatVars );
if ( p->pPars->fPolarFlip )
Lit = lit_neg( Lit );
sat_solver_addclause( p->pSat, &Lit, &Lit + 1 );
Cec_ObjSetSatNum( p, Aig_ManConst1(p->pAig), p->nSatVars++ );
p->nRecycles++;
p->nCallsSince = 0;
}
/**Function*************************************************************
Synopsis [Runs equivalence test for the two nodes.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Cec_ManSatCheckNode( Cec_ManSat_t * p, Aig_Obj_t * pNode )
{
int nBTLimit = p->pPars->nBTLimit;
int Lit, RetValue, status, clk;
// sanity checks
assert( !Aig_IsComplement(pNode) );
p->nCallsSince++; // experiment with this!!!
// check if SAT solver needs recycling
if ( p->pSat == NULL ||
(p->pPars->nSatVarMax &&
p->nSatVars > p->pPars->nSatVarMax &&
p->nCallsSince > p->pPars->nCallsRecycle) )
Cec_ManSatSolverRecycle( p );
// if the nodes do not have SAT variables, allocate them
Cec_CnfNodeAddToSolver( p, pNode );
// propage unit clauses
if ( p->pSat->qtail != p->pSat->qhead )
{
status = sat_solver_simplify(p->pSat);
assert( status != 0 );
assert( p->pSat->qtail == p->pSat->qhead );
}
// solve under assumptions
// A = 1; B = 0 OR A = 1; B = 1
Lit = toLitCond( Cec_ObjSatNum(p,pNode), pNode->fPhase );
if ( p->pPars->fPolarFlip )
{
if ( pNode->fPhase ) Lit = lit_neg( Lit );
}
//Sat_SolverWriteDimacs( p->pSat, "temp.cnf", pLits, pLits + 2, 1 );
clk = clock();
RetValue = sat_solver_solve( p->pSat, &Lit, &Lit + 1,
(ABC_INT64_T)nBTLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
if ( RetValue == l_False )
{
p->timeSatUnsat += clock() - clk;
Lit = lit_neg( Lit );
RetValue = sat_solver_addclause( p->pSat, &Lit, &Lit + 1 );
assert( RetValue );
p->timeSatUnsat++;
return 1;
}
else if ( RetValue == l_True )
{
p->timeSatSat += clock() - clk;
p->timeSatSat++;
return 0;
}
else // if ( RetValue == l_Undef )
{
p->timeSatUndec += clock() - clk;
p->timeSatUndec++;
return -1;
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Cec_MtrStatus_t Cec_SatSolveOutputs( Aig_Man_t * pAig, Cec_ParSat_t * pPars )
{
Bar_Progress_t * pProgress = NULL;
Cec_MtrStatus_t Status;
Cec_ManSat_t * p;
Aig_Obj_t * pObj;
int i, status;
Status = Cec_MiterStatus( pAig );
p = Cec_ManCreate( pAig, pPars );
pProgress = Bar_ProgressStart( stdout, Aig_ManPoNum(pAig) );
Aig_ManForEachPo( pAig, pObj, i )
{
Bar_ProgressUpdate( pProgress, i, "SAT..." );
if ( Cec_OutputStatus(pAig, pObj) )
continue;
status = Cec_ManSatCheckNode( p, Aig_ObjFanin0(pObj) );
if ( status == 1 )
{
Status.nUndec--, Status.nUnsat++;
Aig_ObjPatchFanin0( pAig, pObj, Aig_ManConst0(pAig) );
}
if ( status == 0 )
{
Status.nUndec--, Status.nSat++;
Aig_ObjPatchFanin0( pAig, pObj, Aig_ManConst1(pAig) );
}
if ( status == -1 )
continue;
// save the pattern (if it is first)
if ( Status.iOut == -1 )
{
}
// quit if at least one of them is solved
if ( status == 0 && pPars->fFirstStop )
break;
}
Aig_ManCleanup( pAig );
Bar_ProgressStop( pProgress );
printf( " Confs = %8d. Recycles = %6d.\n", p->pPars->nBTLimit, p->nRecycles );
Cec_ManStop( p );
return Status;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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