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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103417] [12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r12-5489
Date: Wed, 24 Nov 2021 21:45:53 +0000 [thread overview]
Message-ID: <bug-103417-4-zga8n9zyt5@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-103417-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103417
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 51870
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51870&action=edit
gcc12-pr103417.patch
Untested fix. Handling GE in that simplification is clearly bogus, we should
just fold it to true elsewhere, not bother with it (it doesn't handle LT
either,
which should also fold to false elsewhere).
Handling LE and GT there isn't wrong, but makes no sense. Elsewhere we
canonicalize x > 0U into x != 0U and x <= 0U into x == 0U and for signed it
was handling only EQ and NE already before.
next prev parent reply other threads:[~2021-11-24 21:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-24 20:49 [Bug tree-optimization/103417] New: wrong code at -O1 and above on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2021-11-24 21:02 ` [Bug tree-optimization/103417] " pinskia at gcc dot gnu.org
2021-11-24 21:02 ` [Bug tree-optimization/103417] [12 Regression] " pinskia at gcc dot gnu.org
2021-11-24 21:03 ` [Bug tree-optimization/103417] [12 Regression] wrong code at -O1 and above on x86_64-linux-gnu since r12-5489 jakub at gcc dot gnu.org
2021-11-24 21:16 ` jakub at gcc dot gnu.org
2021-11-24 21:45 ` jakub at gcc dot gnu.org [this message]
2021-11-25 2:44 ` tnfchris at gcc dot gnu.org
2021-11-25 9:48 ` cvs-commit at gcc dot gnu.org
2021-11-25 15:22 ` jakub at gcc dot gnu.org
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