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From: "law at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103226] [12 Regression] Recent change to copy-headers causes execution failure for gcc.dg/torture/pr80974
Date: Sat, 20 Nov 2021 07:10:55 +0000 [thread overview]
Message-ID: <bug-103226-4-TzUl7qwAtl@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-103226-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103226
Jeffrey A. Law <law at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P1 |P4
--- Comment #20 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Your c#19 was a bit hard to follow. But you hit the key issue. Namely that
the doloop pattern will set/clobber the condition codes if it gets split.
Failure to show that clobber means that IRA/LRA have incorrect dataflow and
make incorrect decisions.
I'm testing the obvious fix of adding the clobber. It may be possible to
improve on my patch, but I'll leave that to someone who really cares about the
port.
next prev parent reply other threads:[~2021-11-20 7:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-13 20:39 [Bug tree-optimization/103226] New: " law at gcc dot gnu.org
2021-11-14 10:59 ` [Bug tree-optimization/103226] " aldyh at gcc dot gnu.org
2021-11-15 9:03 ` rguenth at gcc dot gnu.org
2021-11-16 2:30 ` law at gcc dot gnu.org
2021-11-17 11:14 ` aldyh at gcc dot gnu.org
2021-11-17 11:32 ` aldyh at gcc dot gnu.org
2021-11-17 15:00 ` tnfchris at gcc dot gnu.org
2021-11-17 15:02 ` tnfchris at gcc dot gnu.org
2021-11-17 15:53 ` aldyh at gcc dot gnu.org
2021-11-17 16:09 ` tnfchris at gcc dot gnu.org
2021-11-17 16:28 ` law at gcc dot gnu.org
2021-11-17 16:29 ` law at gcc dot gnu.org
2021-11-17 16:31 ` aldyh at gcc dot gnu.org
2021-11-17 17:18 ` aldyh at gcc dot gnu.org
2021-11-17 17:54 ` tnfchris at gcc dot gnu.org
2021-11-17 18:31 ` law at gcc dot gnu.org
2021-11-17 18:43 ` aldyh at gcc dot gnu.org
2021-11-17 19:26 ` aldyh at gcc dot gnu.org
2021-11-17 20:02 ` aldyh at gcc dot gnu.org
2021-11-18 13:28 ` aldyh at gcc dot gnu.org
2021-11-20 7:10 ` law at gcc dot gnu.org [this message]
2021-11-20 7:23 ` aldyh at gcc dot gnu.org
2021-11-20 16:30 ` cvs-commit at gcc dot gnu.org
2021-11-20 16:31 ` law at gcc dot gnu.org
2021-12-02 14:55 ` hp at gcc dot gnu.org
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