re PR debug/38367 (Wrong debug information for big endian function parameters)

	PR debug/38367
	* function.c (assign_parm_find_stack_rtl): If promoted_mode
	is wider than DECL_MODE, adjust MEM_OFFSET (stack_parm) for
	big endian.

From-SVN: r142481

gcc/ChangeLog

 2008-12-05  Jakub Jelinek  <jakub@redhat.com>
 
+	PR debug/38367
+	* function.c (assign_parm_find_stack_rtl): If promoted_mode
+	is wider than DECL_MODE, adjust MEM_OFFSET (stack_parm) for
+	big endian.
+
 	PR middle-end/38338
 	* builtins.c (expand_builtin_apply_args): Put before parm_birth_insn
 	only if internal_arg_pointer is a non-virtual pseudo.

gcc/function.c

@@ -2336,7 +2336,17 @@ assign_parm_find_stack_rtl (tree parm, struct assign_parm_data_one *data)
      while promoted mode's size is needed.  */
   if (data->promoted_mode != BLKmode
       && data->promoted_mode != DECL_MODE (parm))
-    set_mem_size (stack_parm, GEN_INT (GET_MODE_SIZE (data->promoted_mode)));
+    {
+      set_mem_size (stack_parm, GEN_INT (GET_MODE_SIZE (data->promoted_mode)));
+      if (MEM_EXPR (stack_parm) && MEM_OFFSET (stack_parm))
+	{
+	  int offset = subreg_lowpart_offset (DECL_MODE (parm),
+					      data->promoted_mode);
+	  if (offset)
+	    set_mem_offset (stack_parm,
+			    plus_constant (MEM_OFFSET (stack_parm), -offset));
+	}
+    }
 
   boundary = data->locate.boundary;
   align = BITS_PER_UNIT;