Update alignment on local variables.

2011-04-14  H.J. Lu  <hongjiu.lu@intel.com>

	PR middle-end/48608
	* cfgexpand.c (get_decl_align_unit): Renamed to ...
	(align_local_variable): This.  Update DECL_ALIGN.
	(add_stack_var): Updated.
	(expand_one_stack_var): Likewise.

From-SVN: r172438

gcc/ChangeLog

+2011-04-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR middle-end/48608
+	* cfgexpand.c (get_decl_align_unit): Renamed to ...
+	(align_local_variable): This.  Update DECL_ALIGN.
+	(add_stack_var): Updated.
+	(expand_one_stack_var): Likewise.
+
 2011-04-14  Richard Guenther  <rguenther@suse.de>
 
 	* tree-ssa-dse.c (struct dse_global_data, struct dse_block_local_data):

gcc/cfgexpand.c

@@ -205,13 +205,14 @@ static bool has_protected_decls;
    smaller than our cutoff threshold.  Used for -Wstack-protector.  */
 static bool has_short_buffer;
 
-/* Discover the byte alignment to use for DECL.  Ignore alignment
+/* Compute the byte alignment to use for DECL.  Ignore alignment
    we can't do with expected alignment of the stack boundary.  */
 
 static unsigned int
-get_decl_align_unit (tree decl)
+align_local_variable (tree decl)
 {
   unsigned int align = LOCAL_DECL_ALIGNMENT (decl);
+  DECL_ALIGN (decl) = align;
   return align / BITS_PER_UNIT;
 }
 
@@ -273,7 +274,7 @@ add_stack_var (tree decl)
      variables that are simultaneously live.  */
   if (v->size == 0)
     v->size = 1;
-  v->alignb = get_decl_align_unit (SSAVAR (decl));
+  v->alignb = align_local_variable (SSAVAR (decl));
 
   /* All variables are initially in their own partition.  */
   v->representative = stack_vars_num;
@@ -905,7 +906,7 @@ expand_one_stack_var (tree var)
   unsigned byte_align;
 
   size = tree_low_cst (DECL_SIZE_UNIT (SSAVAR (var)), 1);
-  byte_align = get_decl_align_unit (SSAVAR (var));
+  byte_align = align_local_variable (SSAVAR (var));
 
   /* We handle highly aligned variables in expand_stack_vars.  */
   gcc_assert (byte_align * BITS_PER_UNIT <= MAX_SUPPORTED_STACK_ALIGNMENT);