[gcc(refs/users/tnfchris/heads/gcc-14-early-break)] middle-end: [RFC] conditionally support forcing final edge for debugging

[gcc(refs/users/tnfchris/heads/gcc-14-early-break)] middle-end: [RFC] conditionally support forcing final edge for debugging

[Tamar Christina]

https://gcc.gnu.org/g:2fa1db59e09083f6ec97fe21ff21b8dc53070638

commit 2fa1db59e09083f6ec97fe21ff21b8dc53070638
Author: Tamar Christina <tamar.christina@arm.com>
Date:   Thu Nov 2 17:09:48 2023 +0000

    middle-end: [RFC] conditionally support forcing final edge for debugging

Diff:
---
 gcc/tree-vect-loop.cc | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index efea49a9237..f4b3addbd1a 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -964,6 +964,7 @@ vec_init_loop_exit_info (class loop *loop)
   if (exits.length () == 1)
     return exits[0];
 
+#if 0
   /* If we have multiple exits we only support counting IV at the moment.  Analyze
      all exits and return one */
   class tree_niter_desc niter_desc;
@@ -982,6 +983,16 @@ vec_init_loop_exit_info (class loop *loop)
     }
 
   return candidate;
+#else
+  basic_block bb = ip_normal_pos (loop);
+  if (!bb)
+    return NULL;
+
+  edge exit = EDGE_SUCC (bb, 0);
+  if (exit->dest == loop->latch)
+    return EDGE_SUCC (bb, 1);
+  return exit;
+#endif
 }
 
 /* Function bb_in_loop_p