[PATCH] Fix -fcompare-debug scheduling issue (PR rtl-optimization/44013)

[Jakub Jelinek]

Hi!

Another patch from Alex I've just bootstrapped/regtested on x86_64-linux and
i686-linux.  Details in the PR, seems to fix the issue on picochip too.

Ok for trunk?

2010-06-04  Alexandre Oliva  <aoliva@redhat.com>

	PR rtl-optimization/44013
	* sched-deps.c (add_dependence_list_and_free): Don't free lists
	when processing debug insns.

--- gcc/sched-deps.c.orig	2010-06-02 02:04:01.000000000 -0300
+++ gcc/sched-deps.c	2010-06-02 02:05:10.000000000 -0300
@@ -1407,7 +1407,10 @@ add_dependence_list_and_free (struct dep
 {
   rtx list, next;
 
-  if (deps->readonly)
+  /* We don't want to short-circuit dependencies involving debug
+     insns, because they may cause actual dependencies to be
+     disregarded.  */
+  if (deps->readonly || DEBUG_INSN_P (insn))
     {
       add_dependence_list (insn, *listp, uncond, dep_type);
       return;

	Jakub