From: Richard Biener <rguenther@suse.de>
Date: Wed, 9 Nov 2022 12:52:58 +0000 (+0100)
Subject: tree-optimization/84646 - remove premature thread path rejection
X-Git-Tag: basepoints/gcc-14~3351
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=837be6c7cfb49e16a18ef8f6c44d98bfa6d2396b;p=thirdparty%2Fgcc.git

tree-optimization/84646 - remove premature thread path rejection

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

	PR tree-optimization/84646
	* tree-ssa-threadbackward.cc (back_threader::maybe_register_path):
	Remove premature cycle rejection.
---

diff --git a/gcc/tree-ssa-threadbackward.cc b/gcc/tree-ssa-threadbackward.cc
index 2a8cfa3ee01a..2290b95717d2 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))