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Subject: [Bug tree-optimization/96573] [10 Regression] Regression in
 optimization on x86-64 with -O3
Date: Tue, 06 Apr 2021 10:46:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96573

--- Comment #7 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:bfeb36bd03c2168af263daa13370a20a96c42b5d

commit r11-8002-gbfeb36bd03c2168af263daa13370a20a96c42b5d
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Apr 6 12:44:51 2021 +0200

    testsuite: Fix up pr96573.c on aarch64 [PR96573]

    On Thu, Apr 01, 2021 at 02:16:55PM +0100, Alex Coplan via Gcc-patches
wrote:
    > FYI, I'm seeing the new test failing on aarch64:
    >
    > PASS: gcc.dg/pr96573.c (test for excess errors)
    > FAIL: gcc.dg/pr96573.c scan-tree-dump optimized "__builtin_bswap"

    The vectorizer in the aarch64 case manages to emit a VEC_PERM_EXPR inst=
ead
    (which is just as efficient).

    So, do we want to go for the following (and/or perhaps also restrict the
test to
    a couple of targets where it works?  In my last distro build it failed =
only
    on aarch64-linux, while armv7hl-linux-gnueabi and
    {i686,x86_64,powerpc64le,s390x}-linux were fine)?

    2021-04-06  Jakub Jelinek  <jakub@redhat.com>

            PR tree-optimization/96573
            * gcc.dg/pr96573.c: Instead of __builtin_bswap accept also
            VEC_PERM_EXPR with bswapping permutation.=