From 1bf2b0351abcc6f96854eb50976ac010ca7f00f1 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Wed, 29 Feb 2012 10:38:18 -0800
Subject: Added skipping &iso when there is only one PO.

---
 src/base/abci/abc.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src')

diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index bd2f5bfe..0eabe4c7 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -27960,6 +27960,11 @@ int Abc_CommandAbc9Iso( Abc_Frame_t * pAbc, int argc, char ** argv )
         Abc_Print( -1, "Abc_CommandAbc9Iso(): There is no AIG.\n" );
         return 1;
     }
+    if ( Gia_ManPoNum(pAbc->pGia) == 1 )
+    {
+        Abc_Print( -1, "Abc_CommandAbc9Iso(): The AIG has only one PO. Isomorphism detection is not performed.\n" );
+        return 1;
+    }
     pAig = Gia_ManIsoReduce( pAbc->pGia, &vPosEquivs, fVerbose );
     // update the internal storage of PO equivalences
     Abc_FrameReplacePoEquivs( pAbc, &vPosEquivs );
-- 
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