re PR rtl-optimization/50764 (ICE: in maybe_record_trace_start, at…

re PR rtl-optimization/50764 (ICE: in maybe_record_trace_start, at dwarf2cfi.c:2243 with -O2 -fsched2-use-superblocks -ftree-tail-merge)

2011-11-22  Tom de Vries  <tom@codesourcery.com>

	PR rtl-optimization/50764
	* sched-deps.c (sched_analyze_insn): Make sure frame-related insns are
	not moved past preceding jump.

From-SVN: r181639

gcc/ChangeLog

+2011-11-22  Tom de Vries  <tom@codesourcery.com>
+
+	PR rtl-optimization/50764
+	* sched-deps.c (sched_analyze_insn): Make sure frame-related insns are
+	not moved past preceding jump.
+
 2011-11-22  Jeff Law  <law@redhat.com>
 
 	* doc/contrib.texi: Add entry for David Binderman.

gcc/sched-deps.c

@@ -2812,8 +2812,14 @@ sched_analyze_insn (struct deps_desc *deps, rtx x, rtx insn)
      during prologue generation and avoid marking the frame pointer setup
      as frame-related at all.  */
   if (RTX_FRAME_RELATED_P (insn))
-    deps->sched_before_next_jump
-      = alloc_INSN_LIST (insn, deps->sched_before_next_jump);
+    {
+      /* Make sure prologue insn is scheduled before next jump.  */
+      deps->sched_before_next_jump
+	= alloc_INSN_LIST (insn, deps->sched_before_next_jump);
+
+      /* Make sure epilogue insn is scheduled after preceding jumps.  */
+      add_dependence_list (insn, deps->pending_jump_insns, 1, REG_DEP_ANTI);
+    }
 
   if (code == COND_EXEC)
     {