tree-ssa-math-opts.c (bswap_replace): Fix SLOW_UNALIGNED_ACCESS test to only…

tree-ssa-math-opts.c (bswap_replace): Fix SLOW_UNALIGNED_ACCESS test to only apply to unaligned object.

2014-06-27  Richard Biener  <rguenther@suse.de>

	* tree-ssa-math-opts.c (bswap_replace): Fix
	SLOW_UNALIGNED_ACCESS test to only apply to unaligned object.

From-SVN: r212068

gcc/ChangeLog

+2014-06-27  Richard Biener  <rguenther@suse.de>
+
+	* tree-ssa-math-opts.c (bswap_replace): Fix
+	SLOW_UNALIGNED_ACCESS test to only apply to unaligned object.
+
 2014-06-27  Martin Liska  <mliska@suse.cz>
 
 	* gimple.h (gimple_location_safe): New function introduced.

gcc/tree-ssa-math-opts.c

@@ -2179,7 +2179,9 @@ bswap_replace (gimple cur_stmt, gimple_stmt_iterator gsi, gimple src_stmt,
       unsigned align;
 
       align = get_object_alignment (src);
-      if (bswap && SLOW_UNALIGNED_ACCESS (TYPE_MODE (load_type), align))
+      if (bswap
+	  && align < GET_MODE_ALIGNMENT (TYPE_MODE (load_type))
+	  && SLOW_UNALIGNED_ACCESS (TYPE_MODE (load_type), align))
 	return false;
 
       gsi_move_before (&gsi, &gsi_ins);