Preventing &iso from removing fanoutless PIs.

src/aig/gia/gia.h

@@ -690,7 +690,7 @@ extern Gia_Man_t *         Gia_ManDupWithConstraints( Gia_Man_t * p, Vec_Int_t *
 extern Gia_Man_t *         Gia_ManDupAbsFlops( Gia_Man_t * p, Vec_Int_t * vFlopClasses );
 extern Gia_Man_t *         Gia_ManDupAbsGates( Gia_Man_t * p, Vec_Int_t * vGateClasses );
 extern Vec_Int_t *         Gia_GlaCollectAssigned( Gia_Man_t * p, Vec_Int_t * vGateClasses );
-extern Gia_Man_t *         Gia_ManDupCones( Gia_Man_t * p, int * pPos, int nPos );
+extern Gia_Man_t *         Gia_ManDupCones( Gia_Man_t * p, int * pPos, int nPos, int fTrimPis );
 /*=== giaEnable.c ==========================================================*/
 extern void                Gia_ManDetectSeqSignals( Gia_Man_t * p, int fSetReset, int fVerbose );
 extern Gia_Man_t *         Gia_ManUnrollAndCofactor( Gia_Man_t * p, int nFrames, int nFanMax, int fVerbose );

src/aig/gia/giaDup.c

@@ -1850,7 +1850,7 @@ void Gia_ManDupCones_rec( Gia_Man_t * p, Gia_Obj_t * pObj, Vec_Ptr_t * vLeaves,
         Vec_PtrPush( vLeaves, pObj );
     else assert( 0 );
 }
-Gia_Man_t * Gia_ManDupCones( Gia_Man_t * p, int * pPos, int nPos )
+Gia_Man_t * Gia_ManDupCones( Gia_Man_t * p, int * pPos, int nPos, int fTrimPis )
 {
     Gia_Man_t * pNew;
     Vec_Ptr_t * vLeaves, * vNodes, * vRoots;
@@ -1877,8 +1877,16 @@ Gia_Man_t * Gia_ManDupCones( Gia_Man_t * p, int * pPos, int nPos )
     // map the constant node
     Gia_ManConst0(p)->Value = 0;
     // create PIs
-    Vec_PtrForEachEntry( Gia_Obj_t *, vLeaves, pObj, i )
-        pObj->Value = Gia_ManAppendCi( pNew );
+    if ( fTrimPis )
+    {
+        Vec_PtrForEachEntry( Gia_Obj_t *, vLeaves, pObj, i )
+            pObj->Value = Gia_ManAppendCi( pNew );
+    }
+    else
+    {
+        Gia_ManForEachPi( p, pObj, i )
+            pObj->Value = Gia_ManAppendCi( pNew );
+    }
     // create LOs
     Vec_PtrForEachEntryStart( Gia_Obj_t *, vRoots, pObj, i, nPos )
         Gia_ObjRiToRo(p, pObj)->Value = Gia_ManAppendCi( pNew );

src/aig/gia/giaIso.c

@@ -1024,7 +1024,7 @@ Vec_Str_t * Gia_ManIsoFindString( Gia_Man_t * p, int iPo, int fVerbose )
     Vec_Int_t * vCis, * vAnds, * vCos;
     Vec_Str_t * vStr;
     // duplicate
-    pPart = Gia_ManDupCones( p, &iPo, 1 );
+    pPart = Gia_ManDupCones( p, &iPo, 1, 1 );
     assert( Gia_ManPoNum(pPart) == 1 );
     if ( Gia_ManCiNum(pPart) == 0 ) // const AIG
     {
@@ -1167,7 +1167,7 @@ Gia_Man_t * Gia_ManIsoReduce( Gia_Man_t * pInit, Vec_Ptr_t ** pvPosEquivs, int f
 
 
     // derive the resulting AIG
-    pPart = Gia_ManDupCones( p, Vec_IntArray(vRemain), Vec_IntSize(vRemain) );
+    pPart = Gia_ManDupCones( p, Vec_IntArray(vRemain), Vec_IntSize(vRemain), 0 );
     Vec_IntFree( vRemain );
     // report the results
     if ( !fDualOut )