rx.c (rx_get_stack_layout): Only save call clobbered registers inside interrupt handlers if...

	* config/rx/rx.c (rx_get_stack_layout): Only save call clobbered
	registers inside interrupt handlers if the handler is not a leaf
	function.

From-SVN: r169434

gcc/ChangeLog

 2011-01-31  Nick Clifton  <nickc@redhat.com>
 
+	* config/rx/rx.c (rx_get_stack_layout): Only save call clobbered
+	registers inside interrupt handlers if the handler is not a leaf
+	function.
+
+2011-01-31  Nick Clifton  <nickc@redhat.com>
+
 	* config/mn10300/mn10300.c (mn10300_regno_in_class_p): Check for
 	reg_renumber returning an INVALID_REGNUM.
 

gcc/config/rx/rx.c

@@ -1137,10 +1137,12 @@ rx_get_stack_layout (unsigned int * lowest,
   for (save_mask = high = low = 0, reg = 1; reg < CC_REGNUM; reg++)
     {
       if ((df_regs_ever_live_p (reg)
-	   /* Always save all call clobbered registers inside interrupt
-	      handlers, even if they are not live - they may be used in
-	      routines called from this one.  */
-	   || (call_used_regs[reg] && is_interrupt_func (NULL_TREE)))
+	   /* Always save all call clobbered registers inside non-leaf
+	      interrupt handlers, even if they are not live - they may
+	      be used in (non-interrupt aware) routines called from this one.  */
+	   || (call_used_regs[reg]
+	       && is_interrupt_func (NULL_TREE)
+	       && ! current_function_is_leaf))
 	  && (! call_used_regs[reg]
 	      /* Even call clobbered registered must
 		 be pushed inside interrupt handlers.  */