From bfebc0751c37d8353b2b2b9e61fe37f2a3f6f6f4 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Tue, 22 Sep 2015 19:51:24 -0700
Subject: Fixing corner-cases in 'tempor' and in 'unfold'.

---
 src/aig/gia/giaDup.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/aig/gia')

diff --git a/src/aig/gia/giaDup.c b/src/aig/gia/giaDup.c
index 1cdf12a3..38adfb41 100644
--- a/src/aig/gia/giaDup.c
+++ b/src/aig/gia/giaDup.c
@@ -3068,6 +3068,11 @@ Gia_Man_t * Gia_ManDupWithConstr( Gia_Man_t * p )
         printf( "The miter's output is not AND-decomposable.\n" );
         return NULL;
     }
+    if ( Gia_ObjFaninId0p(p, pObj) == 0 )
+    {
+        printf( "The miter's output is a constant.\n" );
+        return NULL;
+    }
     vSuper = Vec_IntAlloc( 100 );
     Gia_ManDupWithConstrCollectAnd_rec( p, Gia_ObjChild0(pObj), vSuper, 1 );
     assert( Vec_IntSize(vSuper) > 1 );
-- 
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