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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/111431] a & (a == 0) is not optimized to 0
Date: Mon, 18 Sep 2023 16:13:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111431

--- Comment #7 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:0fb828af75732d39c644fd145c29d41ca14b8cb1

commit r14-4105-g0fb828af75732d39c644fd145c29d41ca14b8cb1
Author: Andrew Pinski <apinski@marvell.com>
Date:   Sat Sep 16 03:27:26 2023 +0000

    MATCH: Add simplifications of `(a =3D=3D CST) & a`

    `(a =3D=3D CST) & a` can be either simplified to simplying `a =3D=3D CS=
T`
    or 0 depending on the first bit of the CST.
    This is an extension of the already pattern of `X & !X` and allows
    us to remove the 2 xfails on gcc.dg/binop-notand1a.c and
gcc.dg/binop-notand4a.c.

    OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

            PR tree-optimization/111431

    gcc/ChangeLog:

            * match.pd (`(a =3D=3D CST) & a`): New pattern.

    gcc/testsuite/ChangeLog:

            * gcc.dg/binop-notand1a.c: Remove xfail.
            * gcc.dg/binop-notand4a.c: Likewise.
            * gcc.c-torture/execute/pr111431-1.c: New test.
            * gcc.dg/binop-andeq1.c: New test.
            * gcc.dg/binop-andeq2.c: New test.
            * gcc.dg/binop-notand7.c: New test.
            * gcc.dg/binop-notand7a.c: New test.=