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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/111432] `bool & (a|1)` is not optimized to
 just `bool`
Date: Tue, 17 Oct 2023 16:04:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111432

--- Comment #3 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:b18d1cabe2f9cccc0cad697e1e0bfd2abebb85f9

commit r14-4686-gb18d1cabe2f9cccc0cad697e1e0bfd2abebb85f9
Author: Andrew Pinski <pinskia@gmail.com>
Date:   Fri Oct 13 13:27:18 2023 -0700

    MATCH: [PR111432] Simplify `a & (x | CST)` to a when we know that (a &
~CST) =3D=3D 0

    This adds the simplification `a & (x | CST)` to a when we know that
    `(a & ~CST) =3D=3D 0`. In a similar fashion as `a & CST` is handle.

    I looked into handling `a | (x & CST)` but that I don't see any decent
    simplifications happening.

    OK? Bootstrapped and tested on x86_linux-gnu with no regressions.

            PR tree-optimization/111432

    gcc/ChangeLog:

            * match.pd (`a & (x | CST)`): New pattern.

    gcc/testsuite/ChangeLog:

            * gcc.dg/tree-ssa/bitops-7.c: New test.=