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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/94921] Failure to optimize nots with sub into
 single add
Date: Wed, 06 May 2020 09:20:51 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94921

--- Comment #4 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:a7b76d574b19190da190a60c065f347f40bab59e

commit r11-132-ga7b76d574b19190da190a60c065f347f40bab59e
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Wed May 6 11:20:20 2020 +0200

    match.pd: Optimize ~(~X +- Y) into (X -+ Y) [PR94921]

    According to my verification proglet, this transformation for signed ty=
pes
    with undefined overflow doesn't introduce nor remove any UB cases, so
should
    be valid even for signed integral types.
    Not using a for because of the :c on plus which can't be there on minus.

    2020-05-06  Jakub Jelinek  <jakub@redhat.com>

            PR tree-optimization/94921
            * match.pd (~(~X - Y) -> X + Y, ~(~X + Y) -> X - Y): New
            simplifications.

            * gcc.dg/tree-ssa/pr94921.c: New test.=