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/**CFile****************************************************************
FileName [bmcLoad.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [SAT-based bounded model checking.]
Synopsis [Experiments with CNF loading.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: bmcLoad.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "bmc.h"
#include "sat/bsat/satStore.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
typedef struct Bmc_Lad_t_ Bmc_Lad_t;
struct Bmc_Lad_t_
{
Bmc_AndPar_t * pPars; // parameters
Gia_Man_t * pGia; // unrolled AIG
sat_solver * pSat; // SAT solvers
Vec_Int_t * vSat2Id; // maps SAT var into its node
// Vec_Int_t * vCut; // cut in terms of GIA IDs
// Vec_Int_t * vCnf; // CNF for the cut
int nCallBacks1;
int nCallBacks2;
};
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Load CNF for the cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Bmc_LadGetSatVar( Bmc_Lad_t * p, int Id )
{
Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Id );
if ( pObj->Value == 0 )
{
pObj->Value = Vec_IntSize( p->vSat2Id );
Vec_IntPush( p->vSat2Id, Id );
sat_solver_setnvars( p->pSat, Vec_IntSize(p->vSat2Id) );
}
return pObj->Value;
}
int Bmc_LadAddCnf( void * pMan, int iLit )
{
Bmc_Lad_t * p = (Bmc_Lad_t *)pMan;
int Lits[3], iVar = Abc_Lit2Var(iLit);
Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Vec_IntEntry(p->vSat2Id, iVar) );
p->nCallBacks1++;
if ( Gia_ObjIsCi(pObj) || Gia_ObjIsConst0(pObj) )
return 0;
assert( Gia_ObjIsAnd(pObj) );
if ( (Abc_LitIsCompl(iLit) ? pObj->fMark1 : pObj->fMark0) )
return 0;
Lits[0] = Abc_LitNot(iLit);
if ( Abc_LitIsCompl(iLit) )
{
Lits[1] = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId0p(p->pGia, pObj)), !Gia_ObjFaninC0(pObj) );
Lits[2] = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId1p(p->pGia, pObj)), !Gia_ObjFaninC1(pObj) );
sat_solver_clause_new( p->pSat, Lits, Lits + 3, 0 );
pObj->fMark1 = 1;
}
else
{
Lits[1] = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId0p(p->pGia, pObj)), Gia_ObjFaninC0(pObj) );
sat_solver_clause_new( p->pSat, Lits, Lits + 2, 0 );
Lits[1] = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId1p(p->pGia, pObj)), Gia_ObjFaninC1(pObj) );
sat_solver_clause_new( p->pSat, Lits, Lits + 2, 0 );
pObj->fMark0 = 1;
}
p->nCallBacks2++;
return 1;
}
int Bmc_LadAddCnf_rec( Bmc_Lad_t * p, int Id )
{
int iVar = Bmc_LadGetSatVar( p, Id );
Gia_Obj_t * pObj = Gia_ManObj( p->pGia, Id );
if ( Gia_ObjIsAnd(pObj) && !(pObj->fMark0 && pObj->fMark1) )
{
Bmc_LadAddCnf( p, Abc_Var2Lit(iVar, 0) );
Bmc_LadAddCnf( p, Abc_Var2Lit(iVar, 1) );
Bmc_LadAddCnf_rec( p, Gia_ObjFaninId0(pObj, Id) );
Bmc_LadAddCnf_rec( p, Gia_ObjFaninId1(pObj, Id) );
}
return iVar;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Bmc_Lad_t * Bmc_LadStart( Gia_Man_t * pGia, Bmc_AndPar_t * pPars )
{
Bmc_Lad_t * p;
int Lit;
Gia_ManSetPhase( pGia );
Gia_ManCleanValue( pGia );
Gia_ManCreateRefs( pGia );
p = ABC_CALLOC( Bmc_Lad_t, 1 );
p->pPars = pPars;
p->pGia = pGia;
p->pSat = sat_solver_new();
p->vSat2Id = Vec_IntAlloc( 1000 );
Vec_IntPush( p->vSat2Id, 0 );
// create constant node
Lit = Abc_Var2Lit( Bmc_LadGetSatVar(p, 0), 1 );
sat_solver_addclause( p->pSat, &Lit, &Lit + 1 );
// add callback for CNF loading
if ( pPars->fLoadCnf )
p->pSat->pCnfMan = p;
if ( pPars->fLoadCnf )
p->pSat->pCnfFunc = Bmc_LadAddCnf;
return p;
}
void Bmc_LadStop( Bmc_Lad_t * p )
{
Vec_IntFree( p->vSat2Id );
sat_solver_delete( p->pSat );
ABC_FREE( p );
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Bmc_PerformBmc( Gia_Man_t * pGia, Bmc_AndPar_t * pPars )
{
// int nConfLimit = 0;
Bmc_Lad_t * p;
Gia_Obj_t * pObj;
int i, status, Lit;
abctime clk = Abc_Clock();
p = Bmc_LadStart( pGia, pPars );
Gia_ManForEachPo( pGia, pObj, i )
{
if ( pPars->fLoadCnf )
Lit = Abc_Var2Lit( Bmc_LadGetSatVar(p, Gia_ObjFaninId0p(pGia, pObj)), Gia_ObjFaninC0(pObj) );
else
Lit = Abc_Var2Lit( Bmc_LadAddCnf_rec(p, Gia_ObjFaninId0p(pGia, pObj)), Gia_ObjFaninC0(pObj) );
if ( pPars->fVerbose )
{
printf( "Frame%4d : ", i );
printf( "Vars = %6d ", Vec_IntSize(p->vSat2Id) );
printf( "Clas = %6d ", sat_solver_nclauses(p->pSat) );
}
status = sat_solver_solve( p->pSat, &Lit, &Lit + 1, (ABC_INT64_T)pPars->nConfLimit, (ABC_INT64_T)0, (ABC_INT64_T)0, (ABC_INT64_T)0 );
if ( pPars->fVerbose )
{
printf( "Conf = %6d ", sat_solver_nconflicts(p->pSat) );
if ( status == l_False )
printf( "UNSAT " );
else if ( status == l_True )
printf( "SAT " );
else // if ( status == l_Undec )
printf( "UNDEC " );
Abc_PrintTime( 1, "Time", Abc_Clock() - clk );
}
}
printf( "Callbacks = %d. Loadings = %d.\n", p->nCallBacks1, p->nCallBacks2 );
Bmc_LadStop( p );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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