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/**CFile****************************************************************
FileName [resSat.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Resynthesis package.]
Synopsis [Interface with the SAT solver.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - January 15, 2007.]
Revision [$Id: resSat.c,v 1.00 2007/01/15 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abc.h"
#include "resInt.h"
#include "hop.h"
#include "satSolver.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
extern int Res_SatAddConst1( sat_solver * pSat, int iVar, int fCompl );
extern int Res_SatAddEqual( sat_solver * pSat, int iVar0, int iVar1, int fCompl );
extern int Res_SatAddAnd( sat_solver * pSat, int iVar, int iVar0, int iVar1, int fCompl0, int fCompl1 );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Loads AIG into the SAT solver.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void * Res_SatProveUnsat( Abc_Ntk_t * pAig, Vec_Ptr_t * vFanins )
{
void * pCnf = NULL;
sat_solver * pSat;
Vec_Ptr_t * vNodes;
Abc_Obj_t * pObj;
int i, nNodes, status;
// make sure fanins contain POs of the AIG
pObj = Vec_PtrEntry( vFanins, 0 );
assert( pObj->pNtk == pAig && Abc_ObjIsPo(pObj) );
// collect reachable nodes
vNodes = Abc_NtkDfsNodes( pAig, (Abc_Obj_t **)vFanins->pArray, vFanins->nSize );
// assign unique numbers to each node
nNodes = 0;
Abc_AigConst1(pAig)->pCopy = (void *)nNodes++;
Abc_NtkForEachPi( pAig, pObj, i )
pObj->pCopy = (void *)nNodes++;
Vec_PtrForEachEntry( vNodes, pObj, i )
pObj->pCopy = (void *)nNodes++;
Vec_PtrForEachEntry( vFanins, pObj, i ) // useful POs
pObj->pCopy = (void *)nNodes++;
// start the solver
pSat = sat_solver_new();
sat_solver_store_alloc( pSat );
// add clause for the constant node
Res_SatAddConst1( pSat, (int)Abc_AigConst1(pAig)->pCopy, 0 );
// add clauses for AND gates
Vec_PtrForEachEntry( vNodes, pObj, i )
Res_SatAddAnd( pSat, (int)pObj->pCopy,
(int)Abc_ObjFanin0(pObj)->pCopy, (int)Abc_ObjFanin1(pObj)->pCopy, Abc_ObjFaninC0(pObj), Abc_ObjFaninC1(pObj) );
Vec_PtrFree( vNodes );
// add clauses for POs
Vec_PtrForEachEntry( vFanins, pObj, i )
Res_SatAddEqual( pSat, (int)pObj->pCopy,
(int)Abc_ObjFanin0(pObj)->pCopy, Abc_ObjFaninC0(pObj) );
// add trivial clauses
pObj = Vec_PtrEntry(vFanins, 0);
Res_SatAddConst1( pSat, (int)pObj->pCopy, 0 ); // care-set
pObj = Vec_PtrEntry(vFanins, 1);
Res_SatAddConst1( pSat, (int)pObj->pCopy, 0 ); // on-set
// bookmark the clauses of A
sat_solver_store_mark_clauses_a( pSat );
// duplicate the clauses
pObj = Vec_PtrEntry(vFanins, 1);
Sat_SolverDoubleClauses( pSat, (int)pObj->pCopy );
// add the equality constraints
Vec_PtrForEachEntryStart( vFanins, pObj, i, 2 )
Res_SatAddEqual( pSat, (int)pObj->pCopy, ((int)pObj->pCopy) + nNodes, 0 );
// bookmark the roots
sat_solver_store_mark_roots( pSat );
// solve the problem
status = sat_solver_solve( pSat, NULL, NULL, (sint64)10000, (sint64)0, (sint64)0, (sint64)0 );
if ( status == l_False )
{
pCnf = sat_solver_store_release( pSat );
// printf( "unsat\n" );
}
else if ( status == l_True )
{
// printf( "sat\n" );
}
else
{
// printf( "undef\n" );
}
sat_solver_delete( pSat );
return pCnf;
}
/**Function*************************************************************
Synopsis [Asserts equality of the variable to a constant.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Res_SatAddConst1( sat_solver * pSat, int iVar, int fCompl )
{
lit Lit = toLitCond( iVar, fCompl );
if ( !sat_solver_addclause( pSat, &Lit, &Lit + 1 ) )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Asserts equality of two variables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Res_SatAddEqual( sat_solver * pSat, int iVar0, int iVar1, int fCompl )
{
lit Lits[2];
Lits[0] = toLitCond( iVar0, 0 );
Lits[1] = toLitCond( iVar1, !fCompl );
if ( !sat_solver_addclause( pSat, Lits, Lits + 2 ) )
return 0;
Lits[0] = toLitCond( iVar0, 1 );
Lits[1] = toLitCond( iVar1, fCompl );
if ( !sat_solver_addclause( pSat, Lits, Lits + 2 ) )
return 0;
return 1;
}
/**Function*************************************************************
Synopsis [Adds constraints for the two-input AND-gate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Res_SatAddAnd( sat_solver * pSat, int iVar, int iVar0, int iVar1, int fCompl0, int fCompl1 )
{
lit Lits[3];
Lits[0] = toLitCond( iVar, 1 );
Lits[1] = toLitCond( iVar0, fCompl0 );
if ( !sat_solver_addclause( pSat, Lits, Lits + 2 ) )
return 0;
Lits[0] = toLitCond( iVar, 1 );
Lits[1] = toLitCond( iVar1, fCompl1 );
if ( !sat_solver_addclause( pSat, Lits, Lits + 2 ) )
return 0;
Lits[0] = toLitCond( iVar, 0 );
Lits[1] = toLitCond( iVar0, !fCompl0 );
Lits[2] = toLitCond( iVar1, !fCompl1 );
if ( !sat_solver_addclause( pSat, Lits, Lits + 3 ) )
return 0;
return 1;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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