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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/109240] Missed fneg/fsub optimization
Date: Tue, 18 Apr 2023 09:02:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109240

--- Comment #3 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:2349e69125335d4c8c5e43cf3643844519d154c3

commit r14-22-g2349e69125335d4c8c5e43cf3643844519d154c3
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Apr 18 11:01:47 2023 +0200

    match.pd: Improve fneg/fadd optimization [PR109240]

    match.pd has mostly for AArch64 an optimization in which it optimizes
    certain forms of __builtin_shuffle of x + y and x - y vectors into
    fneg using twice as wide element type so that every other sign is chang=
ed,
    followed by fadd.

    The following patch extends that optimization, so that it can handle
    other forms as well, using the same fneg but fsub instead of fadd.

    As the plus is commutative and minus is not and I want to handle
    vec_perm with plus minus and minus plus order preferrably in one
    pattern, I had to do the matching operand checks by hand.

    2023-04-18  Jakub Jelinek  <jakub@redhat.com>

            PR tree-optimization/109240
            * match.pd (fneg/fadd): Rewrite such that it handles both plus =
as
            first vec_perm operand and minus as second using fneg/fadd and
            minus as first vec_perm operand and plus as second using fneg/f=
sub.

            * gcc.target/aarch64/simd/addsub_2.c: New test.
            * gcc.target/aarch64/sve/addsub_2.c: New test.=