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/**CFile****************************************************************
FileName [resFilter.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Resynthesis package.]
Synopsis [Filtering resubstitution candidates.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - January 15, 2007.]
Revision [$Id: resFilter.c,v 1.00 2007/01/15 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abc.h"
#include "resInt.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static unsigned * Res_FilterCollectFaninInfo( Res_Win_t * pWin, Res_Sim_t * pSim, unsigned uMask );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Finds sets of feasible candidates.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Res_FilterCandidates( Res_Win_t * pWin, Abc_Ntk_t * pAig, Res_Sim_t * pSim, Vec_Vec_t * vResubs, Vec_Vec_t * vResubsW )
{
Abc_Obj_t * pFanin, * pFanin2;
unsigned * pInfo;
int Counter, RetValue, i, k;
// check that the info the node is one
pInfo = Vec_PtrEntry( pSim->vOuts, 1 );
RetValue = Abc_InfoIsOne( pInfo, pSim->nWordsOut );
if ( RetValue == 0 )
printf( "Failed 1!\n" );
// collect the fanin info
pInfo = Res_FilterCollectFaninInfo( pWin, pSim, ~0 );
RetValue = Abc_InfoIsOne( pInfo, pSim->nWordsOut );
if ( RetValue == 0 )
printf( "Failed 2!\n" );
// try removing fanins
// printf( "Fanins: " );
Counter = 0;
Vec_VecClear( vResubs );
Vec_VecClear( vResubsW );
Abc_ObjForEachFanin( pWin->pNode, pFanin, i )
{
pInfo = Res_FilterCollectFaninInfo( pWin, pSim, ~(1 << i) );
RetValue = Abc_InfoIsOne( pInfo, pSim->nWordsOut );
if ( RetValue )
{
// printf( "Node %4d. Removing fanin %4d.\n", pWin->pNode->Id, Abc_ObjFaninId(pWin->pNode, i) );
// collect the nodes
Vec_VecPush( vResubs, Counter, Abc_NtkPo(pAig,0) );
Vec_VecPush( vResubs, Counter, Abc_NtkPo(pAig,1) );
Abc_ObjForEachFanin( pWin->pNode, pFanin2, k )
{
if ( k != i )
{
Vec_VecPush( vResubs, Counter, Abc_NtkPo(pAig,2+k) );
Vec_VecPush( vResubsW, Counter, pFanin2 );
}
}
Counter++;
}
if ( Counter == Vec_VecSize(vResubs) )
break;
// printf( "%d", RetValue );
}
// printf( "\n\n" );
return Counter;
}
/**Function*************************************************************
Synopsis [Finds sets of feasible candidates.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
unsigned * Res_FilterCollectFaninInfo( Res_Win_t * pWin, Res_Sim_t * pSim, unsigned uMask )
{
Abc_Obj_t * pFanin;
unsigned * pInfo;
int i;
pInfo = Vec_PtrEntry( pSim->vOuts, 0 );
Abc_InfoClear( pInfo, pSim->nWordsOut );
Abc_ObjForEachFanin( pWin->pNode, pFanin, i )
{
if ( uMask & (1 << i) )
Abc_InfoOr( pInfo, Vec_PtrEntry(pSim->vOuts, 2+i), pSim->nWordsOut );
}
return pInfo;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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