Fix va_arg ap_copy nop detection

2015-04-22  Tom de Vries  <tom@codesourcery.com>

	PR tree-optimization/65823
	* gimplify.c (gimplify_modify_expr): Use operand_equal_p to test for
	equality between ap_copy and ap.

From-SVN: r222318

gcc/ChangeLog

+2015-04-22  Tom de Vries  <tom@codesourcery.com>
+
+	PR tree-optimization/65823
+	* gimplify.c (gimplify_modify_expr): Use operand_equal_p to test for
+	equality between ap_copy and ap.
+
 2015-04-22  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>
 
 	PR target/47098

gcc/gimplify.c

@@ -4792,7 +4792,7 @@ gimplify_modify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
   if (ap != NULL_TREE
       && TREE_CODE (ap) == ADDR_EXPR
       && TREE_CODE (ap_copy) == ADDR_EXPR
-      && TREE_OPERAND (ap, 0) != TREE_OPERAND (ap_copy, 0))
+      && !operand_equal_p (TREE_OPERAND (ap, 0), TREE_OPERAND (ap_copy, 0), 0))
     gimplify_assign (TREE_OPERAND (ap, 0), TREE_OPERAND (ap_copy, 0), pre_p);
 
   if (want_value)