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Subject: [Bug tree-optimization/106379] DCE depends on order
Date: Thu, 21 Jul 2022 11:24:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106379

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:375668e0508fbe173af1ed519d8ae2b79f388d94

commit r13-1779-g375668e0508fbe173af1ed519d8ae2b79f388d94
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jul 21 13:20:47 2022 +0200

    tree-optimization/106379 - add missing ~(a ^ b) folding for _Bool

    The following makes sure to fold ~(a ^ b) to a =3D=3D b for truth
    values (but not vectors, we'd have to check for vector support of
    equality).  That turns the PR106379 testcase into a ranger one.

    Note that while we arrive at ~(a ^ b) in a convoluted way from
    original !a =3D=3D !b one can eventually write the expression this
    way directly as well.

            PR tree-optimization/106379
            * match.pd (~(a ^ b) -> a =3D=3D b): New pattern.

            * gcc.dg/pr106379-1.c: New testcase.=