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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/96715] Failure to optimize copysign of
 variable by negated variable
Date: Tue, 25 Aug 2020 05:22:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96715

--- Comment #2 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:bb5e895245ebef488b63efc239f64488aef65cf1

commit r11-2832-gbb5e895245ebef488b63efc239f64488aef65cf1
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Aug 25 07:21:26 2020 +0200

    match.pd: Simplify copysign (x, -x) to -x [PR96715]

    The following patch implements an optimization suggested in the PR,
    copysign(x,-x) can be optimized into -x (even without -ffast-math,
    should work fine even for signed zeros and infinities or nans).

    2020-08-25  Jakub Jelinek  <jakub@redhat.com>

            PR tree-optimization/96715
            * match.pd (copysign(x,-x) -> -x): New simplification.

            * gcc.dg/tree-ssa/copy-sign-3.c: New test.=