[PATCH] tree-optimization/84646 - remove premature thread path rejection

[Richard Biener via Gcc-patches]

This removes a premature rejection that's done later in a different
way.

Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.

        PR tree-optimization/84646
        * tree-ssa-threadbackward.cc (back_threader::maybe_register_path):
        Remove premature cycle rejection.
---
 gcc/tree-ssa-threadbackward.cc | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)

diff --git a/gcc/tree-ssa-threadbackward.cc b/gcc/tree-ssa-threadbackward.cc
index 2a8cfa3ee01..2290b95717d 100644
--- a/gcc/tree-ssa-threadbackward.cc
+++ b/gcc/tree-ssa-threadbackward.cc
@@ -249,25 +249,16 @@ back_threader::maybe_register_path 
(back_threader_profitability &profit)
 
   if (taken_edge && taken_edge != UNREACHABLE_EDGE)
     {
-      if (m_visited_bbs.contains (taken_edge->dest))
+      bool irreducible = false;
+      if (profit.profitable_path_p (m_path, taken_edge, &irreducible)
+         && debug_counter ()
+         && m_registry.register_path (m_path, taken_edge))
        {
-         // Avoid circular paths by indicating there is nothing to
-         // see in this direction.
-         taken_edge = UNREACHABLE_EDGE;
+         if (irreducible)
+           vect_free_loop_info_assumptions (m_path[0]->loop_father);
        }
       else
-       {
-         bool irreducible = false;
-         if (profit.profitable_path_p (m_path, taken_edge, &irreducible)
-             && debug_counter ()
-             && m_registry.register_path (m_path, taken_edge))
-           {
-             if (irreducible)
-               vect_free_loop_info_assumptions (m_path[0]->loop_father);
-           }
-         else
-           taken_edge = NULL;
-       }
+       taken_edge = NULL;
     }
 
   if (dump_file && (dump_flags & TDF_DETAILS))
-- 
2.35.3