sscSat.c File Reference

#include "sscInt.h"
#include "sat/cnf/cnf.h"
#include "aig/gia/giaAig.h"

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Functions
void	Ssc_ManStartSolver (Ssc_Man_t *p)
void	Ssc_ManCollectSatPattern (Ssc_Man_t *p, Vec_Int_t *vPattern)
Vec_Int_t *	Ssc_ManFindPivotSat (Ssc_Man_t *p)
int	Ssc_ManCheckEquivalence (Ssc_Man_t *p, int iRepr, int iNode, int fCompl)

Function Documentation

Ssc_ManCheckEquivalence()

int Ssc_ManCheckEquivalence	(	Ssc_Man_t *	p,
		int	iRepr,
		int	iNode,
		int	fCompl )

Function*************************************************************

Synopsis []

Description []

SideEffects []

SeeAlso []

Definition at line 348 of file sscSat.c.

{
    int pLitsSat[2], RetValue;
    abctime clk;
    assert( iRepr != iNode );
    if ( iRepr > iNode )
        return l_Undef;
    assert( iRepr < iNode );
//    if ( p->nTimeOut )
//        sat_solver_set_runtime_limit( p->pSat, p->nTimeOut * CLOCKS_PER_SEC + Abc_Clock() );
 
    // create CNF
    if ( iRepr )
    Ssc_ManCnfNodeAddToSolver( p, iRepr );
    Ssc_ManCnfNodeAddToSolver( p, iNode );
    sat_solver_compress( p->pSat );
 
    // order the literals
    pLitsSat[0] = Abc_Var2Lit( Ssc_ObjSatVar(p, iRepr), 0 );
    pLitsSat[1] = Abc_Var2Lit( Ssc_ObjSatVar(p, iNode), fCompl ^ (int)(iRepr > 0) );
 
    // solve under assumptions
    // A = 1; B = 0
    clk = Abc_Clock();
    RetValue = sat_solver_solve( p->pSat, pLitsSat, pLitsSat + 2, (ABC_INT64_T)p->pPars->nBTLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
    if ( RetValue == l_False )
    {
        pLitsSat[0] = Abc_LitNot( pLitsSat[0] ); // compl
        pLitsSat[1] = Abc_LitNot( pLitsSat[1] ); // compl
        RetValue = sat_solver_addclause( p->pSat, pLitsSat, pLitsSat + 2 );
        assert( RetValue );
        p->timeSatUnsat += Abc_Clock() - clk;
    }
    else if ( RetValue == l_True )
    {
        Ssc_ManCollectSatPattern( p, p->vPattern );
        p->timeSatSat += Abc_Clock() - clk;
        return l_True;
    }
    else // if ( RetValue1 == l_Undef )
    {
        p->timeSatUndec += Abc_Clock() - clk;
        return l_Undef;
    }
 
    // if the old node was constant 0, we already know the answer
    if ( iRepr == 0 )
        return l_False;
 
    // solve under assumptions
    // A = 0; B = 1
    clk = Abc_Clock();
    RetValue = sat_solver_solve( p->pSat, pLitsSat, pLitsSat + 2, (ABC_INT64_T)p->pPars->nBTLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
    if ( RetValue == l_False )
    {
        pLitsSat[0] = Abc_LitNot( pLitsSat[0] );
        pLitsSat[1] = Abc_LitNot( pLitsSat[1] );
        RetValue = sat_solver_addclause( p->pSat, pLitsSat, pLitsSat + 2 );
        assert( RetValue );
        p->timeSatUnsat += Abc_Clock() - clk;
    }
    else if ( RetValue == l_True )
    {
        Ssc_ManCollectSatPattern( p, p->vPattern );
        p->timeSatSat += Abc_Clock() - clk;
        return l_True;
    }
    else // if ( RetValue1 == l_Undef )
    {
        p->timeSatUndec += Abc_Clock() - clk;
        return l_Undef;
    }
    return l_False;
}

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Ssc_ManCollectSatPattern()

void Ssc_ManCollectSatPattern	(	Ssc_Man_t *	p,
		Vec_Int_t *	vPattern )

Function*************************************************************

Synopsis []

Description []

SideEffects []

SeeAlso []

Definition at line 315 of file sscSat.c.

{
    Gia_Obj_t * pObj;
    int i;
    Vec_IntClear( vPattern );
    Gia_ManForEachCi( p->pFraig, pObj, i )
        Vec_IntPush( vPattern, sat_solver_var_value(p->pSat, Ssc_ObjSatVar(p, Gia_ObjId(p->pFraig, pObj))) );
}

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Ssc_ManFindPivotSat()

Vec_Int_t * Ssc_ManFindPivotSat

(

Ssc_Man_t *

p

)

Definition at line 323 of file sscSat.c.

{
    Vec_Int_t * vInit;
    int status = sat_solver_solve( p->pSat, NULL, NULL, p->pPars->nBTLimit, 0, 0, 0 );
    if ( status == l_False )
        return (Vec_Int_t *)(ABC_PTRINT_T)1;
    if ( status == l_Undef )
        return NULL;
    assert( status == l_True );
    vInit = Vec_IntAlloc( Gia_ManCiNum(p->pFraig) );
    Ssc_ManCollectSatPattern( p, vInit );
    return vInit;
}

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Ssc_ManStartSolver()

void Ssc_ManStartSolver

(

Ssc_Man_t *

p

)

Function*************************************************************

Synopsis [Starts the SAT solver for constraints.]

Description []

SideEffects []

SeeAlso []

Definition at line 261 of file sscSat.c.

{
    Aig_Man_t * pMan = Gia_ManToAigSimple( p->pFraig );
    Cnf_Dat_t * pDat = Cnf_Derive( pMan, 0 );
    Gia_Obj_t * pObj;
    sat_solver * pSat;
    int i, status;
    assert( p->pSat == NULL && p->vId2Var == NULL );
    assert( Aig_ManObjNumMax(pMan) == Gia_ManObjNum(p->pFraig) );
    Aig_ManStop( pMan );
    // save variable mapping
    p->nSatVarsPivot = p->nSatVars = pDat->nVars;
    p->vId2Var = Vec_IntStart( Gia_ManCandNum(p->pAig) + Gia_ManCandNum(p->pCare) + 10 ); // mapping of each node into its SAT var
    p->vVar2Id = Vec_IntStart( Gia_ManCandNum(p->pAig) + Gia_ManCandNum(p->pCare) + 10 ); // mapping of each SAT var into its node
    Ssc_ObjSetSatVar( p, 0, pDat->pVarNums[0] );
    Gia_ManForEachCi( p->pFraig, pObj, i )
    {
        int iObj = Gia_ObjId( p->pFraig, pObj );
        Ssc_ObjSetSatVar( p, iObj, pDat->pVarNums[iObj] );
    }
//Cnf_DataWriteIntoFile( pDat, "dump.cnf", 1, NULL, NULL );
    // start the SAT solver
    pSat = sat_solver_new();
    sat_solver_setnvars( pSat, pDat->nVars + 1000 );
    for ( i = 0; i < pDat->nClauses; i++ )
    {
        if ( !sat_solver_addclause( pSat, pDat->pClauses[i], pDat->pClauses[i+1] ) )
        {
            Cnf_DataFree( pDat );
            sat_solver_delete( pSat );
            return;
        }
    }
    Cnf_DataFree( pDat );
    status = sat_solver_simplify( pSat );
    if ( status == 0 )
    {
        sat_solver_delete( pSat );
        return;
    }
    p->pSat = pSat;
}

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