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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 middle-end/101955] (signed<<31)>>31 should become -(signed&1)
Date: Fri, 04 Aug 2023 07:10:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101955

--- Comment #6 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:9020da78df2854f14f8b1d38b58a6d3b77a4b731

commit r14-2977-g9020da78df2854f14f8b1d38b58a6d3b77a4b731
Author: Drew Ross <drross@redhat.com>
Date:   Fri Aug 4 09:08:05 2023 +0200

    match.pd: Canonicalize (signed x << c) >> c [PR101955]

    Canonicalizes (signed x << c) >> c into the lowest
    precision(type) - c bits of x IF those bits have a mode precision or a
    precision of 1. Also combines this rule with (unsigned x << c) >> c -> =
x &
    ((unsigned)-1 >> c) to prevent duplicate pattern.

            PR middle-end/101955
            * match.pd ((signed x << c) >> c): New canonicalization.

            * gcc.dg/pr101955.c: New test.=