Modified structural constraint extraction (unfold -s) to work for multi-output testcases.

src/base/abci/abc.c

@@ -21280,9 +21280,9 @@ int Abc_CommandUnfold( Abc_Frame_t * pAbc, int argc, char ** argv )
         Abc_Print( -1, "Constraints are already extracted.\n" );
         return 0;
     }
-    if ( Abc_NtkPoNum(pNtk) > 1 )
+    if ( Abc_NtkPoNum(pNtk) > 1 && !fStruct )
     {
-        Abc_Print( -1, "Constraint extraction works for single-output miters (use \"orpos\").\n" );
+        Abc_Print( -1, "Functional constraint extraction works for single-output miters (use \"orpos\").\n" );
         return 0;
     }
     // modify the current network

src/misc/vec/vecPtr.h

@@ -781,6 +781,28 @@ static inline void Vec_PtrReverseOrder( Vec_Ptr_t * p )
 
 /**Function*************************************************************
 
+  Synopsis    [Checks if two vectors are equal.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline int Vec_PtrEqual( Vec_Ptr_t * p1, Vec_Ptr_t * p2 ) 
+{
+    int i;
+    if ( p1->nSize != p2->nSize )
+        return 0;
+    for ( i = 0; i < p1->nSize; i++ )
+        if ( p1->pArray[i] != p2->pArray[i] )
+            return 0;
+    return 1;
+}
+
+/**Function*************************************************************
+
   Synopsis    [Comparison procedure for two integers.]
 
   Description []