2010-07-4 Richard Guenther <rguenther@suse.de>

	* tree-ssa-sccvn.c (vn_reference_lookup_3): Fix last commit.

From-SVN: r161799

gcc/ChangeLog

 2010-07-04  Richard Guenther  <rguenther@suse.de>
 
+	* tree-ssa-sccvn.c (vn_reference_lookup_3): Fix last commit.
+
+2010-07-04  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/44656
 	* tree-ssa-sccvn.c (vn_reference_lookup_3): Try disambiguation
 	again after value-replacing in the defintions lhs.

gcc/tree-ssa-sccvn.c

@@ -1218,12 +1218,12 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void *vr_)
       tree lhs = gimple_assign_lhs (def_stmt);
       ao_ref ref1;
       VEC (vn_reference_op_s, heap) *operands = NULL;
-      bool res;
+      bool res = true;
       copy_reference_ops_from_ref (lhs, &operands);
       operands = valueize_refs (operands);
-      ao_ref_init_from_vn_reference (&ref1, get_alias_set (lhs),
-				     TREE_TYPE (lhs), operands);
-      res = refs_may_alias_p_1 (ref, &ref1, true);
+      if (ao_ref_init_from_vn_reference (&ref1, get_alias_set (lhs),
+					 TREE_TYPE (lhs), operands))
+	res = refs_may_alias_p_1 (ref, &ref1, true);
       VEC_free (vn_reference_op_s, heap, operands);
       if (!res)
 	return NULL;