stor-layout.c (layout_decl): Do not bump the alignment of a bit-field to more…

stor-layout.c (layout_decl): Do not bump the alignment of a bit-field to more than byte alignment if...

	* stor-layout.c (layout_decl): Do not bump the alignment of a
	bit-field to more than byte alignment if it is packed.

From-SVN: r132614

gcc/ChangeLog

+2008-02-25  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* stor-layout.c (layout_decl): Do not bump the alignment of a
+	bit-field to more than byte alignment if it is packed.
+
 2008-02-24  David Edelsohn  <edelsohn@gnu.org>
 
 	* config/rs6000/rs6000.c (processor_costs): Add cache costs for

gcc/stor-layout.c

@@ -388,13 +388,13 @@ layout_decl (tree decl, unsigned int known_align)
 	    {
 	      enum machine_mode xmode
 		= mode_for_size_tree (DECL_SIZE (decl), MODE_INT, 1);
+	      unsigned int xalign = GET_MODE_ALIGNMENT (xmode);
 
 	      if (xmode != BLKmode
-		  && (known_align == 0
-		      || known_align >= GET_MODE_ALIGNMENT (xmode)))
+		  && !(xalign > BITS_PER_UNIT && DECL_PACKED (decl))
+		  && (known_align == 0 || known_align >= xalign))
 		{
-		  DECL_ALIGN (decl) = MAX (GET_MODE_ALIGNMENT (xmode),
-					   DECL_ALIGN (decl));
+		  DECL_ALIGN (decl) = MAX (xalign, DECL_ALIGN (decl));
 		  DECL_MODE (decl) = xmode;
 		  DECL_BIT_FIELD (decl) = 0;
 		}