re PR middle-end/43513 (The stack pointer is adjusted twice)

2011-07-31  Tom de Vries  <tom@codesourcery.com>

	PR middle-end/43513
	* tree-ssa-loop-ivopts.c (may_be_unaligned_p): Use max of
	get_object_alignment and TYPE_ALIGN.

From-SVN: r176969

gcc/ChangeLog

+2011-07-31  Tom de Vries  <tom@codesourcery.com>
+
+	PR middle-end/43513
+	* tree-ssa-loop-ivopts.c (may_be_unaligned_p): Use max of
+	get_object_alignment and TYPE_ALIGN.
+
 2011-07-30  Tom de Vries  <tom@codesourcery.com>
 
 	PR middle-end/43513

gcc/tree-ssa-loop-ivopts.c

@@ -1635,7 +1635,8 @@ may_be_unaligned_p (tree ref, tree step)
   base = get_inner_reference (ref, &bitsize, &bitpos, &toffset, &mode,
 			      &unsignedp, &volatilep, true);
   base_type = TREE_TYPE (base);
-  base_align = TYPE_ALIGN (base_type);
+  base_align = get_object_alignment (base, BIGGEST_ALIGNMENT);
+  base_align = MAX (base_align, TYPE_ALIGN (base_type));
 
   if (mode != BLKmode)
     {