for  gcc/ChangeLog
from  Alexandre Oliva  <aoliva@redhat.com>

	PR debug/47620
	PR debug/47630
	* haifa-sched.c (fix_tick_ready): Skip tick computation
	for debug insns.

Index: gcc/haifa-sched.c
===================================================================
--- gcc/haifa-sched.c.orig	2011-02-14 08:40:11.038553356 -0200
+++ gcc/haifa-sched.c	2011-02-17 19:27:31.612583867 -0200
@@ -3903,7 +3903,7 @@ fix_tick_ready (rtx next)
 {
   int tick, delay;
 
-  if (!sd_lists_empty_p (next, SD_LIST_RES_BACK))
+  if (!DEBUG_INSN_P (next) && !sd_lists_empty_p (next, SD_LIST_RES_BACK))
     {
       int full_p;
       sd_iterator_def sd_it;