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

	* sched-deps.c (sched_analyze_insn): Don't force debug insns
	to follow their original predecessors.

Index: gcc/sched-deps.c
===================================================================
--- gcc/sched-deps.c.orig	2011-02-24 09:54:12.016654388 -0300
+++ gcc/sched-deps.c	2011-02-24 09:55:48.456918435 -0300
@@ -2816,7 +2816,7 @@ sched_analyze_insn (struct deps_desc *de
 	 additional analysis can modify the generated code.  */
       prev = PREV_INSN (insn);
-
-      if (prev && NONDEBUG_INSN_P (prev))
-	add_dependence (insn, prev, REG_DEP_ANTI);
     }
   else