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Handling the trivial case when PO is driven by a constant.

This commit is contained in:
Alan Mishchenko 2012-07-11 15:45:55 -07:00
parent 2427563269
commit da02d5aa9d
2 changed files with 25 additions and 0 deletions
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12
src/aig/gia/giaAbsGla.c
View File

@ -1744,6 +1744,18 @@ int Gia_GlaPerform( Gia_Man_t * pAig, Gia_ParVta_t * pPars, int fStartVta )
// preconditions
assert( Gia_ManPoNum(pAig) == 1 );
assert( pPars->nFramesMax == 0 || pPars->nFramesStart <= pPars->nFramesMax );
if ( Gia_ObjIsConst0(Gia_ObjFanin0(Gia_ManPo(pAig,0))) )
{
if ( !Gia_ObjFaninC0(Gia_ManPo(pAig,0)) )
{
printf( "Sequential miter is trivially UNSAT.\n" );
return 1;
}
ABC_FREE( pAig->pCexSeq );
pAig->pCexSeq = Abc_CexMakeTriv( Gia_ManRegNum(pAig), Gia_ManPiNum(pAig), 1, 0 );
printf( "Sequential miter is trivially SAT.\n" );
return 0;
}
// compute intial abstraction
if ( pAig->vGateClasses == NULL )

13
src/aig/gia/giaAbsVta.c
View File

@ -1528,6 +1528,19 @@ int Gia_VtaPerformInt( Gia_Man_t * pAig, Gia_ParVta_t * pPars )
// preconditions
assert( Gia_ManPoNum(pAig) == 1 );
assert( pPars->nFramesMax == 0 || pPars->nFramesStart <= pPars->nFramesMax );
if ( Gia_ObjIsConst0(Gia_ObjFanin0(Gia_ManPo(pAig,0))) )
{
if ( !Gia_ObjFaninC0(Gia_ManPo(pAig,0)) )
{
printf( "Sequential miter is trivially UNSAT.\n" );
return 1;
}
ABC_FREE( pAig->pCexSeq );
pAig->pCexSeq = Abc_CexMakeTriv( Gia_ManRegNum(pAig), Gia_ManPiNum(pAig), 1, 0 );
printf( "Sequential miter is trivially SAT.\n" );
return 0;
}
// compute intial abstraction
if ( pAig->vObjClasses == NULL )
{