re PR rtl-optimization/44013 (VTA produces wrong code)

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

From-SVN: r160281

gcc/ChangeLog

 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.
+
 	PR debug/41371
 	* var-tracking.c (find_loc_in_1pdv): Mark initial value before
 	recursing.  Check that recursion is bounded.  Rename inner var

gcc/sched-deps.c

@@ -1407,7 +1407,10 @@ add_dependence_list_and_free (struct deps_desc *deps, rtx insn, rtx *listp,
 {
   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;