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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/105832] [13/14 Regression] Dead Code
 Elimination Regression at -O3 (trunk vs. 12.1.0)
Date: Tue, 05 Sep 2023 20:57:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105832

--- Comment #18 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Andrew Pinski <pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:b34f373635635fa331d2803d9232b3cfd4fd4fd1

commit r14-3719-gb34f373635635fa331d2803d9232b3cfd4fd4fd1
Author: Andrew Pinski <apinski@marvell.com>
Date:   Sun Sep 3 06:04:41 2023 +0000

    MATCH: Transform `(1 >> X) !=3D/=3D=3D 0` into `X =3D=3D/!=3D 0`

    We currently have a pattern for handling `(C >> X) & D =3D=3D 0`
    but if C is 1 and D is 1, the `& 1` might have been removed.

    gcc/ChangeLog:

            PR tree-optimization/105832
            * match.pd (`(1 >> X) !=3D 0`): New pattern

    gcc/testsuite/ChangeLog:

            PR tree-optimization/105832
            * gcc.dg/tree-ssa/pr105832-1.c: New test.
            * gcc.dg/tree-ssa/pr105832-2.c: New test.
            * gcc.dg/tree-ssa/pr105832-3.c: New test.=