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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114787] [13/14 Regression] wrong code at -O1 on x86_64-linux-gnu (the generated code hangs)
Date: Wed, 24 Apr 2024 06:12:19 +0000 [thread overview]
Message-ID: <bug-114787-4-imJxHfrnGs@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-114787-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114787
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Status|NEW |ASSIGNED
--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #13)
> -fdump-tree-all-all changing generated code is also bad. We probably
> should avoid dumping loop bounds then they are not recorded. I added dumping
> of loop bounds and this may be unexpected side effect. WIll take a look.
I think consistently estimating the number of iterations here is correct.
I don't think the bug should be P1, it's latent and exposed only with an
artificial testcase. We've likely had similar bugs before where we end up
associating estimates with a wrong loop after some CFG transform.
In this case we end up with the i-loop header being associated with a former
irreducible region. The fix in the past was to release estimates/niters
on problematic transforms. Let me have a look.
next prev parent reply other threads:[~2024-04-24 6:12 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-20 10:53 [Bug tree-optimization/114787] New: " zhendong.su at inf dot ethz.ch
2024-04-20 10:59 ` [Bug tree-optimization/114787] [14 Regression] " jakub at gcc dot gnu.org
2024-04-20 14:22 ` law at gcc dot gnu.org
2024-04-20 22:03 ` [Bug target/114787] " pinskia at gcc dot gnu.org
2024-04-20 23:03 ` [Bug tree-optimization/114787] " pinskia at gcc dot gnu.org
2024-04-20 23:10 ` [Bug tree-optimization/114787] [13/14 " pinskia at gcc dot gnu.org
2024-04-20 23:37 ` pinskia at gcc dot gnu.org
2024-04-20 23:50 ` pinskia at gcc dot gnu.org
2024-04-22 7:39 ` jakub at gcc dot gnu.org
2024-04-22 7:49 ` jakub at gcc dot gnu.org
2024-04-22 8:08 ` jakub at gcc dot gnu.org
2024-04-22 8:24 ` pinskia at gcc dot gnu.org
2024-04-22 9:09 ` jakub at gcc dot gnu.org
2024-04-22 12:45 ` jakub at gcc dot gnu.org
2024-04-22 13:01 ` hubicka at gcc dot gnu.org
2024-04-24 6:12 ` rguenth at gcc dot gnu.org [this message]
2024-04-24 6:47 ` rguenth at gcc dot gnu.org
2024-04-24 8:13 ` cvs-commit at gcc dot gnu.org
2024-04-24 8:14 ` [Bug tree-optimization/114787] [13 " rguenth at gcc dot gnu.org
2024-04-24 14:38 ` hubicka at gcc dot gnu.org
2024-05-06 13:15 ` cvs-commit at gcc dot gnu.org
2024-05-06 13:15 ` rguenth at gcc dot gnu.org
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