Correctly handling transfer of additional AIG info when AIG has no internal nodes.

src/aig/gia/giaFx.c

@@ -460,7 +460,11 @@ Gia_Man_t * Gia_ManPerformFx( Gia_Man_t * p, int nNewNodesMax, int LitCountMax,
     Vec_Wec_t * vCubes;
     Vec_Str_t * vCompl;
     if ( Gia_ManAndNum(p) == 0 )
-        return Gia_ManDup(p);
+    {
+        pNew = Gia_ManDup(p);
+        Gia_ManTransferTiming( pNew, p );
+        return pNew;
+    }
 //    abctime clk;
     assert( Gia_ManHasMapping(p) );   
     // collect information

src/aig/gia/giaScript.c

@@ -88,7 +88,11 @@ Gia_Man_t * Gia_ManAigSyn2( Gia_Man_t * pInit, int fOldAlgo, int fCoarsen, int f
     p = Gia_ManDup( pInit );
     Gia_ManTransferTiming( p, pInit );
     if ( Gia_ManAndNum(p) == 0 )
-        return p;
+    {
+        pNew = Gia_ManDup(p);
+        Gia_ManTransferTiming( pNew, p );
+        return pNew;
+    }
     // delay optimization
     if ( fDelayMin && p->pManTime == NULL )
     {
@@ -157,7 +161,11 @@ Gia_Man_t * Gia_ManAigSyn3( Gia_Man_t * p, int fVerbose, int fVeryVerbose )
     pPars->nRelaxRatio = 40;
     if ( fVerbose )     Gia_ManPrintStats( p, NULL );
     if ( Gia_ManAndNum(p) == 0 )
-        return Gia_ManDup(p);
+    {
+        pNew = Gia_ManDup(p);
+        Gia_ManTransferTiming( pNew, p );
+        return pNew;
+    }
     // perform balancing
     pNew = Gia_ManAreaBalance( p, 0, ABC_INFINITY, fVeryVerbose, 0 );
     if ( fVerbose )     Gia_ManPrintStats( pNew, NULL );
@@ -189,7 +197,11 @@ Gia_Man_t * Gia_ManAigSyn4( Gia_Man_t * p, int fVerbose, int fVeryVerbose )
     pPars->nRelaxRatio = 40;
     if ( fVerbose )     Gia_ManPrintStats( p, NULL );
     if ( Gia_ManAndNum(p) == 0 )
-        return Gia_ManDup(p);
+    {
+        pNew = Gia_ManDup(p);
+        Gia_ManTransferTiming( pNew, p );
+        return pNew;
+    }
 //Gia_ManAigPrintPiLevels( p );
     // perform balancing
     pNew = Gia_ManAreaBalance( p, 0, ABC_INFINITY, fVeryVerbose, 0 );