alias.c (alias_set_subset_of): Handle alias-set zero child properly.

2010-04-15  Richard Guenther  <rguenther@suse.de>

	* alias.c (alias_set_subset_of): Handle alias-set zero
	child properly.

From-SVN: r158380

gcc/ChangeLog

+2010-04-15  Richard Guenther  <rguenther@suse.de>
+
+	* alias.c (alias_set_subset_of): Handle alias-set zero
+	child properly.
+
 2010-04-15  Mark Shinwell  <shinwell@codesourcery.com>
 	    Julian Brown  <julian@codesourcery.com>
 

gcc/alias.c

@@ -413,7 +413,7 @@ alias_set_subset_of (alias_set_type set1, alias_set_type set2)
   /* Otherwise, check if set1 is a subset of set2.  */
   ase = get_alias_set_entry (set2);
   if (ase != 0
-      && ((ase->has_zero_child && set1 == 0)
+      && (ase->has_zero_child
 	  || splay_tree_lookup (ase->children,
 			        (splay_tree_key) set1)))
     return true;