rs6000.c (rs6000_emit_epilogue): Set use_backchain_to_restore_sp to true if...

2008-06-24  Andrew Pinski  <andrew_pinski@playstation.sony.com>

        * config/rs6000/rs6000.c (rs6000_emit_epilogue): Set
        use_backchain_to_restore_sp to true
        if the offset of the link register save area would go over the 32k - 1
        offset limit of the load
        instructions.

From-SVN: r137097

gcc/ChangeLog

+2008-06-24  Andrew Pinski  <andrew_pinski@playstation.sony.com>
+
+	* config/rs6000/rs6000.c (rs6000_emit_epilogue): Set
+	use_backchain_to_restore_sp to true
+	if the offset of the link register save area would go over the 32k - 1
+	offset limit of the load
+	instructions.
+
 2008-06-25  Hans-Peter Nilsson  <hp@axis.com>
 
 	* doc/invoke.texi (Optimize Options) <fstrict-aliasing>: Add

gcc/config/rs6000/rs6000.c

@@ -16313,6 +16313,9 @@ rs6000_emit_epilogue (int sibcall)
      frame pointer for alloca, but the generic parts of the compiler
      give us one anyway.  */
   use_backchain_to_restore_sp = (info->total_size > 32767
+				 || info->total_size
+				     + (info->lr_save_p ? info->lr_save_offset : 0)
+				       > 32767
 				 || (cfun->calls_alloca
 				     && !frame_pointer_needed));