[PATCH] shrink-wrap: Fix up partitions (PR67587)

[Segher Boessenkool]

With the new shrink-wrap algorithm, blocks reachable both with and
without prologue are duplicated, and their incoming edges are then
distributed accordingly.  So we need to call fixup_partitions.

Is this okay for trunk?


Segher


2015-09-16  Segher Boessenkool  <segher@kernel.crashing.org>

	PR bootstrap/67587
	* function.c (rest_of_handle_thread_prologue_and_epilogue): Call
	fixup_partitions.

---
 gcc/function.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/function.c b/gcc/function.c
index 5ff298a..1ff2ee8 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -6677,6 +6677,10 @@ rest_of_handle_thread_prologue_and_epilogue (void)
      scheduling to operate in the epilogue.  */
   thread_prologue_and_epilogue_insns ();
 
+  /* Some non-cold blocks may now be only reachable from cold blocks.
+     Fix that up.  */
+  fixup_partitions ();
+
   /* Shrink-wrapping can result in unreachable edges in the epilogue,
      see PR57320.  */
   cleanup_cfg (0);
-- 
1.8.1.4