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/**CFile****************************************************************
FileName [sfmCnf.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [SAT-based optimization using internal don't-cares.]
Synopsis [CNF computation.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: sfmCnf.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "sfmInt.h"
#include "bool/kit/kit.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sfm_PrintCnf( Vec_Str_t * vCnf )
{
char Entry;
int i, Lit;
Vec_StrForEachEntry( vCnf, Entry, i )
{
Lit = (int)Entry;
if ( Lit == -1 )
printf( "\n" );
else
printf( "%s%d ", Abc_LitIsCompl(Lit) ? "-":"", Abc_Lit2Var(Lit) );
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Sfm_TruthToCnf( word Truth, int nVars, Vec_Int_t * vCover, Vec_Str_t * vCnf )
{
Vec_StrClear( vCnf );
if ( Truth == 0 || ~Truth == 0 )
{
// assert( nVars == 0 );
Vec_StrPush( vCnf, (char)(Truth == 0) );
Vec_StrPush( vCnf, (char)-1 );
return 1;
}
else
{
int i, k, c, RetValue, Literal, Cube, nCubes = 0;
assert( nVars > 0 );
for ( c = 0; c < 2; c ++ )
{
Truth = c ? ~Truth : Truth;
RetValue = Kit_TruthIsop( (unsigned *)&Truth, nVars, vCover, 0 );
assert( RetValue == 0 );
nCubes += Vec_IntSize( vCover );
Vec_IntForEachEntry( vCover, Cube, i )
{
for ( k = 0; k < nVars; k++ )
{
Literal = 3 & (Cube >> (k << 1));
if ( Literal == 1 ) // '0' -> pos lit
Vec_StrPush( vCnf, (char)Abc_Var2Lit(k, 0) );
else if ( Literal == 2 ) // '1' -> neg lit
Vec_StrPush( vCnf, (char)Abc_Var2Lit(k, 1) );
else if ( Literal != 0 )
assert( 0 );
}
Vec_StrPush( vCnf, (char)Abc_Var2Lit(nVars, c) );
Vec_StrPush( vCnf, (char)-1 );
}
}
return nCubes;
}
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Wec_t * Sfm_CreateCnf( Sfm_Ntk_t * p )
{
Vec_Wec_t * vCnfs;
Vec_Str_t * vCnf, * vCnfBase;
word uTruth;
int i, nCubes;
vCnf = Vec_StrAlloc( 100 );
vCnfs = Vec_WecStart( p->nObjs );
Vec_WrdForEachEntryStartStop( p->vTruths, uTruth, i, p->nPis, Vec_WrdSize(p->vTruths)-p->nPos )
{
nCubes = Sfm_TruthToCnf( uTruth, Sfm_ObjFaninNum(p, i), p->vCover, vCnf );
vCnfBase = (Vec_Str_t *)Vec_WecEntry( vCnfs, i );
Vec_StrGrow( vCnfBase, Vec_StrSize(vCnf) );
memcpy( Vec_StrArray(vCnfBase), Vec_StrArray(vCnf), Vec_StrSize(vCnf) );
vCnfBase->nSize = Vec_StrSize(vCnf);
}
Vec_StrFree( vCnf );
return vCnfs;
}
/**Function*************************************************************
Synopsis []
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Sfm_TranslateCnf( Vec_Wec_t * vRes, Vec_Str_t * vCnf, Vec_Int_t * vFaninMap, int iPivotVar )
{
Vec_Int_t * vClause;
char Entry;
int i, Lit;
Vec_WecClear( vRes );
vClause = Vec_WecPushLevel( vRes );
Vec_StrForEachEntry( vCnf, Entry, i )
{
if ( (int)Entry == -1 )
{
vClause = Vec_WecPushLevel( vRes );
continue;
}
Lit = Abc_Lit2LitV( Vec_IntArray(vFaninMap), (int)Entry );
Lit = Abc_LitNotCond( Lit, Abc_Lit2Var(Lit) == iPivotVar );
Vec_IntPush( vClause, Lit );
}
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
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