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/**CFile****************************************************************
FileName [sscUtil.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [SAT sweeping under constraints.]
Synopsis [Various utilities.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 29, 2008.]
Revision [$Id: sscUtil.c,v 1.00 2008/07/29 00:00:00 alanmi Exp $]
***********************************************************************/
#include "sscInt.h"
#include "sat/cnf/cnf.h"
#include "aig/gia/giaAig.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Gia_Man_t * Gia_ManDropContained( Gia_Man_t * p )
{
Gia_Man_t * pNew;
Aig_Man_t * pMan = Gia_ManToAigSimple( p );
Cnf_Dat_t * pDat = Cnf_Derive( pMan, Gia_ManPoNum(p) );
Gia_Obj_t * pObj;
Vec_Int_t * vLits, * vKeep;
sat_solver * pSat;
int ConstLit = Abc_Var2Lit(pDat->pVarNums[0], 0);
int i, status;//, Count = 0;
Aig_ManStop( pMan );
vLits = Vec_IntAlloc( Gia_ManPoNum(p) );
Gia_ManForEachPo( p, pObj, i )
{
int iObj = Gia_ObjId( p, pObj );
Vec_IntPush( vLits, Abc_Var2Lit(pDat->pVarNums[iObj], 1) );
}
// start the SAT solver
pSat = sat_solver_new();
sat_solver_setnvars( pSat, pDat->nVars );
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 );
Vec_IntFree( vLits );
return NULL;
}
}
Cnf_DataFree( pDat );
status = sat_solver_simplify( pSat );
if ( status == 0 )
{
sat_solver_delete( pSat );
Vec_IntFree( vLits );
return NULL;
}
// iterate over POs
vKeep = Vec_IntAlloc( Gia_ManPoNum(p) );
Gia_ManForEachPo( p, pObj, i )
{
Vec_IntWriteEntry( vLits, i, Abc_LitNot(Vec_IntEntry(vLits,i)) );
status = sat_solver_solve( pSat, Vec_IntArray(vLits), Vec_IntArray(vLits) + Vec_IntSize(vLits), 0, 0, 0, 0 );
Vec_IntWriteEntry( vLits, i, Abc_LitNot(Vec_IntEntry(vLits,i)) );
if ( status == l_False )
Vec_IntWriteEntry( vLits, i, ConstLit ); // const1 SAT var is always true
else
{
assert( status = l_True );
Vec_IntPush( vKeep, i );
}
}
sat_solver_delete( pSat );
Vec_IntFree( vLits );
if ( Vec_IntSize(vKeep) == Gia_ManPoNum(p) )
{
Vec_IntFree( vKeep );
return Gia_ManDup(p);
}
pNew = Gia_ManDupCones( p, Vec_IntArray(vKeep), Vec_IntSize(vKeep), 0 );
Vec_IntFree( vKeep );
return pNew;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Gia_Man_t * Gia_ManOptimizeRing( Gia_Man_t * p )
{
Ssc_Pars_t Pars, * pPars = &Pars;
Gia_Man_t * pTemp, * pAux;
int i;
assert( p->nConstrs == 0 );
printf( "User AIG: " );
Gia_ManPrintStats( p, NULL );
pTemp = Gia_ManDropContained( p );
printf( "Drop AIG: " );
Gia_ManPrintStats( pTemp, NULL );
// return pTemp;
if ( Gia_ManPoNum(pTemp) == 1 )
return pTemp;
Ssc_ManSetDefaultParams( pPars );
pPars->fAppend = 1;
pPars->fVerbose = 0;
pTemp->nConstrs = Gia_ManPoNum(pTemp) - 1;
for ( i = 0; i < Gia_ManPoNum(pTemp); i++ )
{
// move i-th PO forward
Gia_ManSwapPos( pTemp, i );
pTemp = Gia_ManDupDfs( pAux = pTemp );
Gia_ManStop( pAux );
// minimize this PO
pTemp = Ssc_PerformSweepingConstr( pAux = pTemp, pPars );
Gia_ManStop( pAux );
pTemp = Gia_ManDupDfs( pAux = pTemp );
Gia_ManStop( pAux );
// move i-th PO back
Gia_ManSwapPos( pTemp, i );
pTemp = Gia_ManDupDfs( pAux = pTemp );
Gia_ManStop( pAux );
// report results
printf( "AIG%3d : ", i );
Gia_ManPrintStats( pTemp, NULL );
}
pTemp->nConstrs = 0;
return pTemp;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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