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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94802] Failure to recognize identities with __builtin_clz
Date: Thu, 31 Dec 2020 10:10:11 +0000 [thread overview]
Message-ID: <bug-94802-4-OTh7M9Fl28@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94802-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94802
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>:
https://gcc.gnu.org/g:d2eb616a0f7bea78164912aa438c29fe1ef5774a
commit r11-6378-gd2eb616a0f7bea78164912aa438c29fe1ef5774a
Author: Jakub Jelinek <jakub@redhat.com>
Date: Thu Dec 31 11:09:26 2020 +0100
match.pd: Add clz(X) == 0 -> (int)X < 0 etc. simpifications [PR94802]
The following patch adds some clz simplifications. If
clz is 0, then the MSB of the argument is set, and if clz is prec-1, then
the argument is 1.
2020-12-31 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/94802
* match.pd (clz(X) == 0 -> (int)X < 0): New simplification.
(clz(X) == (prec-1) -> X == 1): Likewise.
* gcc.dg/tree-ssa/pr94802-1.c: New test.
next prev parent reply other threads:[~2020-12-31 10:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-27 15:10 [Bug tree-optimization/94802] New: " gabravier at gmail dot com
2020-04-27 15:14 ` [Bug tree-optimization/94802] " gabravier at gmail dot com
2020-04-27 15:22 ` jakub at gcc dot gnu.org
2020-12-31 10:10 ` cvs-commit at gcc dot gnu.org [this message]
2020-12-31 10:15 ` jakub at gcc dot gnu.org
2021-01-02 8:44 ` jakub at gcc dot gnu.org
2021-01-05 10:25 ` rguenth at gcc dot gnu.org
2021-01-05 10:28 ` rguenth at gcc dot gnu.org
2021-01-05 11:18 ` jakub at gcc dot gnu.org
2021-01-05 12:13 ` jakub at gcc dot gnu.org
2021-01-05 14:32 ` denis.campredon at gmail dot com
2021-01-05 18:14 ` cvs-commit at gcc dot gnu.org
2021-01-05 18:16 ` jakub at gcc dot gnu.org
2021-08-14 22:29 ` pinskia at gcc dot gnu.org
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