Index: gcc-4_8-branch/gcc/calls.c
===================================================================
--- gcc-4_8-branch.orig/gcc/calls.c	2013-12-28 17:41:32.056627059 +0100
+++ gcc-4_8-branch/gcc/calls.c	2013-12-28 17:50:43.356356135 +0100
@@ -983,6 +983,7 @@ store_unaligned_arguments_into_pseudos (
 
   for (i = 0; i < num_actuals; i++)
     if (args[i].reg != 0 && ! args[i].pass_on_stack
+	&& GET_CODE (args[i].reg) != PARALLEL
 	&& args[i].mode == BLKmode
 	&& MEM_P (args[i].value)
 	&& (MEM_ALIGN (args[i].value)
@@ -1327,6 +1328,7 @@ initialize_argument_information (int num
 #else
 			     args[i].reg != 0,
 #endif
+			     reg_parm_stack_space,
 			     args[i].pass_on_stack ? 0 : args[i].partial,
 			     fndecl, args_size, &args[i].locate);
 #ifdef BLOCK_REG_PADDING
@@ -3171,7 +3173,9 @@ expand_call (tree exp, rtx target, int i
 	 group load/store machinery below.  */
       if (!structure_value_addr
 	  && !pcc_struct_value
+	  && TYPE_MODE (rettype) != VOIDmode
 	  && TYPE_MODE (rettype) != BLKmode
+	  && REG_P (valreg)
 	  && targetm.calls.return_in_msb (rettype))
 	{
 	  if (shift_return_value (TYPE_MODE (rettype), false, valreg))
@@ -3734,7 +3738,8 @@ emit_library_call_value_1 (int retval, r
 #else
 			   argvec[count].reg != 0,
 #endif
-			   0, NULL_TREE, &args_size, &argvec[count].locate);
+			   reg_parm_stack_space, 0,
+			   NULL_TREE, &args_size, &argvec[count].locate);
 
       if (argvec[count].reg == 0 || argvec[count].partial != 0
 	  || reg_parm_stack_space > 0)
@@ -3821,7 +3826,7 @@ emit_library_call_value_1 (int retval, r
 #else
 			       argvec[count].reg != 0,
 #endif
-			       argvec[count].partial,
+			       reg_parm_stack_space, argvec[count].partial,
 			       NULL_TREE, &args_size, &argvec[count].locate);
 	  args_size.constant += argvec[count].locate.size.constant;
 	  gcc_assert (!argvec[count].locate.size.var);
Index: gcc-4_8-branch/gcc/function.c
===================================================================
--- gcc-4_8-branch.orig/gcc/function.c	2013-12-28 17:41:32.056627059 +0100
+++ gcc-4_8-branch/gcc/function.c	2013-12-28 17:50:43.362356165 +0100
@@ -2507,6 +2507,7 @@ assign_parm_find_entry_rtl (struct assig
     }
 
   locate_and_pad_parm (data->promoted_mode, data->passed_type, in_regs,
+		       all->reg_parm_stack_space,
 		       entry_parm ? data->partial : 0, current_function_decl,
 		       &all->stack_args_size, &data->locate);
 
@@ -3485,11 +3486,7 @@ assign_parms (tree fndecl)
   /* Adjust function incoming argument size for alignment and
      minimum length.  */
 
-#ifdef REG_PARM_STACK_SPACE
-  crtl->args.size = MAX (crtl->args.size,
-				    REG_PARM_STACK_SPACE (fndecl));
-#endif
-
+  crtl->args.size = MAX (crtl->args.size, all.reg_parm_stack_space);
   crtl->args.size = CEIL_ROUND (crtl->args.size,
 					   PARM_BOUNDARY / BITS_PER_UNIT);
 
@@ -3693,6 +3690,9 @@ gimplify_parameters (void)
    IN_REGS is nonzero if the argument will be passed in registers.  It will
    never be set if REG_PARM_STACK_SPACE is not defined.
 
+   REG_PARM_STACK_SPACE is the number of bytes of stack space reserved
+   for arguments which are passed in registers.
+
    FNDECL is the function in which the argument was defined.
 
    There are two types of rounding that are done.  The first, controlled by
@@ -3713,19 +3713,16 @@ gimplify_parameters (void)
 
 void
 locate_and_pad_parm (enum machine_mode passed_mode, tree type, int in_regs,
-		     int partial, tree fndecl ATTRIBUTE_UNUSED,
+		     int reg_parm_stack_space, int partial,
+		     tree fndecl ATTRIBUTE_UNUSED,
 		     struct args_size *initial_offset_ptr,
 		     struct locate_and_pad_arg_data *locate)
 {
   tree sizetree;
   enum direction where_pad;
   unsigned int boundary, round_boundary;
-  int reg_parm_stack_space = 0;
   int part_size_in_regs;
 
-#ifdef REG_PARM_STACK_SPACE
-  reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl);
-
   /* If we have found a stack parm before we reach the end of the
      area reserved for registers, skip that area.  */
   if (! in_regs)
@@ -3743,7 +3740,6 @@ locate_and_pad_parm (enum machine_mode p
 	    initial_offset_ptr->constant = reg_parm_stack_space;
 	}
     }
-#endif /* REG_PARM_STACK_SPACE */
 
   part_size_in_regs = (reg_parm_stack_space == 0 ? partial : 0);
 
@@ -3806,11 +3802,7 @@ locate_and_pad_parm (enum machine_mode p
 
   locate->slot_offset.constant += part_size_in_regs;
 
-  if (!in_regs
-#ifdef REG_PARM_STACK_SPACE
-      || REG_PARM_STACK_SPACE (fndecl) > 0
-#endif
-     )
+  if (!in_regs || reg_parm_stack_space > 0)
     pad_to_arg_alignment (&locate->slot_offset, boundary,
 			  &locate->alignment_pad);
 
@@ -3830,11 +3822,7 @@ locate_and_pad_parm (enum machine_mode p
     pad_below (&locate->offset, passed_mode, sizetree);
 
 #else /* !ARGS_GROW_DOWNWARD */
-  if (!in_regs
-#ifdef REG_PARM_STACK_SPACE
-      || REG_PARM_STACK_SPACE (fndecl) > 0
-#endif
-      )
+  if (!in_regs || reg_parm_stack_space > 0)
     pad_to_arg_alignment (initial_offset_ptr, boundary,
 			  &locate->alignment_pad);
   locate->slot_offset = *initial_offset_ptr;
@@ -5093,6 +5081,7 @@ expand_function_end (void)
 	     amount.  BLKmode results are handled using the group load/store
 	     machinery.  */
 	  if (TYPE_MODE (TREE_TYPE (decl_result)) != BLKmode
+	      && REG_P (real_decl_rtl)
 	      && targetm.calls.return_in_msb (TREE_TYPE (decl_result)))
 	    {
 	      emit_move_insn (gen_rtx_REG (GET_MODE (decl_rtl),
Index: gcc-4_8-branch/gcc/expr.h
===================================================================
--- gcc-4_8-branch.orig/gcc/expr.h	2013-12-28 17:41:32.056627059 +0100
+++ gcc-4_8-branch/gcc/expr.h	2013-12-28 17:50:43.366356185 +0100
@@ -521,8 +521,8 @@ extern rtx expand_divmod (int, enum tree
 			  rtx, int);
 #endif
 
-extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
-				 struct args_size *,
+extern void locate_and_pad_parm (enum machine_mode, tree, int, int, int,
+				 tree, struct args_size *,
 				 struct locate_and_pad_arg_data *);
 
 /* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
