tree-ssa-sccvn.c (visit_reference_op_call): Handle NULL vdef.

2014-01-15  Teresa Johnson  <tejohnson@google.com>

	* tree-ssa-sccvn.c (visit_reference_op_call): Handle NULL vdef.

From-SVN: r206646

gcc/ChangeLog

+2014-01-15  Teresa Johnson  <tejohnson@google.com>
+
+	* tree-ssa-sccvn.c (visit_reference_op_call): Handle NULL vdef.
+
 2014-01-15  Bill Schmidt  <wschmidt@vnet.linux.ibm.com>
 
 	* config/rs6000/altivec.md (mulv8hi3): Explicitly generate vmulesh

gcc/tree-ssa-sccvn.c

@@ -2792,7 +2792,7 @@ visit_reference_op_call (tree lhs, gimple stmt)
 
   if (vnresult)
     {
-      if (vnresult->result_vdef)
+      if (vnresult->result_vdef && vdef)
 	changed |= set_ssa_val_to (vdef, vnresult->result_vdef);
 
       if (!vnresult->result && lhs)