tree-ssa-alias.c (stmt_kills_ref_p_1): Properly compare MEM_REF offsets.

2013-05-17  Richard Biener  <rguenther@suse.de>

	* tree-ssa-alias.c (stmt_kills_ref_p_1): Properly compare
	MEM_REF offsets.

From-SVN: r199014

gcc/ChangeLog

+2013-05-17  Richard Biener  <rguenther@suse.de>
+
+	* tree-ssa-alias.c (stmt_kills_ref_p_1): Properly compare
+	MEM_REF offsets.
+
 2013-05-17  Jakub Jelinek  <jakub@redhat.com>
 
 	* gcc.c (SANITIZER_SPEC): Reject -fsanitize=address -fsanitize=thread

gcc/tree-ssa-alias.c

@@ -2002,8 +2002,8 @@ stmt_kills_ref_p_1 (gimple stmt, ao_ref *ref)
 	  if (TREE_CODE (base) == MEM_REF && TREE_CODE (ref->base) == MEM_REF
 	      && TREE_OPERAND (base, 0) == TREE_OPERAND (ref->base, 0))
 	    {
-	      if (!tree_int_cst_equal (TREE_OPERAND (base, 0),
-				       TREE_OPERAND (ref->base, 0)))
+	      if (!tree_int_cst_equal (TREE_OPERAND (base, 1),
+				       TREE_OPERAND (ref->base, 1)))
 		{
 		  double_int off1 = mem_ref_offset (base);
 		  off1 = off1.lshift (BITS_PER_UNIT == 8