[gcc r12-1446] Assert we have irreducible regions marked in the threader

[gcc r12-1446] Assert we have irreducible regions marked in the threader

[Richard Biener]

https://gcc.gnu.org/g:b10f895f41dbe98f2a7d448b91d083a68792a6a0

commit r12-1446-gb10f895f41dbe98f2a7d448b91d083a68792a6a0
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Jun 15 10:27:47 2021 +0200

    Assert we have irreducible regions marked in the threader
    
    This adds an assert that would fire if any thread path registry
    user runs into the check that relies on such regions marked.
    
    2021-06-15  Richard Biener  <rguenther@suse.de>
    
            * tree-ssa-threadupdate.c
            (jump_thread_path_registry::mark_threaded_blocks): Assert we
            have marked irreducible regions.

Diff:
---
 gcc/tree-ssa-threadupdate.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/tree-ssa-threadupdate.c b/gcc/tree-ssa-threadupdate.c
index a86302be18e..f496dd3eb8c 100644
--- a/gcc/tree-ssa-threadupdate.c
+++ b/gcc/tree-ssa-threadupdate.c
@@ -2122,6 +2122,8 @@ jump_thread_path_registry::mark_threaded_blocks (bitmap threaded_blocks)
 	{
 	  if (e->aux)
 	    {
+	      gcc_assert (loops_state_satisfies_p
+			    (LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS));
 	      vec<jump_thread_edge *> *path = THREAD_PATH (e);
 
 	      for (unsigned int i = 0, crossed_headers = 0;