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Merge pull request #139 from antmicro/fix-unconnected-couts-upstream 

Consider unconnected carry-out ports
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alanminko 2021-11-10 09:48:58 -08:00 committed by GitHub
parent 079a309a0d 348c74e0a6
commit 9b245d9f69
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 24 additions and 1 deletions
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25
src/aig/gia/giaSweep.c
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@ -388,6 +388,14 @@ Vec_Int_t * Gia_ManComputeCarryOuts( Gia_Man_t * p )
Tim_Man_t * pManTime = (Tim_Man_t *)p->pManTime; Tim_Man_t * pManTime = (Tim_Man_t *)p->pManTime;
int i, iLast, iBox, nBoxes = Tim_ManBoxNum( pManTime ); int i, iLast, iBox, nBoxes = Tim_ManBoxNum( pManTime );
Vec_Int_t * vCarryOuts = Vec_IntAlloc( nBoxes ); Vec_Int_t * vCarryOuts = Vec_IntAlloc( nBoxes );
// Create and populate reference count (and free later) only if not already
// done.
int createRefs = (p->pRefs == NULL);
if (createRefs) {
Gia_ManCreateRefs( p );
}
for ( i = 0; i < nBoxes; i++ ) for ( i = 0; i < nBoxes; i++ )
{ {
iLast = Tim_ManBoxInputLast( pManTime, i ); iLast = Tim_ManBoxInputLast( pManTime, i );
@ -398,9 +406,24 @@ Vec_Int_t * Gia_ManComputeCarryOuts( Gia_Man_t * p )
if ( iBox == -1 ) if ( iBox == -1 )
continue; continue;
assert( Gia_ObjIsCi(pObj) ); assert( Gia_ObjIsCi(pObj) );
if ( Gia_ObjCioId(pObj) == Tim_ManBoxOutputLast(pManTime, iBox) ) if ( Gia_ObjCioId(pObj) == Tim_ManBoxOutputLast(pManTime, iBox) ) {
Vec_IntPush( vCarryOuts, Gia_ObjId(p, pObj) ); Vec_IntPush( vCarryOuts, Gia_ObjId(p, pObj) );
// We have identified a carry connection. Check if the carry out
// of the destination box is unconnected. If so then add it to
// the carry list as well.
iLast = Tim_ManBoxOutputLast(pManTime, i);
pObj = Gia_ManCi(p, iLast);
if ( Gia_ObjRefNum(p, pObj) == 0 ) {
Vec_IntPush( vCarryOuts, Gia_ObjId(p, pObj) );
}
}
} }
if (createRefs) {
ABC_FREE( p->pRefs );
}
return vCarryOuts; return vCarryOuts;
} }