From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 4DE283953075; Tue, 10 Aug 2021 10:38:35 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4DE283953075
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/80355] Improve __builtin_shuffle on AVX512F
Date: Tue, 10 Aug 2021 10:38:34 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 7.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: jakub at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-80355-4-XL2bAuq5Sz@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-80355-4@http.gcc.gnu.org/bugzilla/>
References: <bug-80355-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Tue, 10 Aug 2021 10:38:35 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D80355

--- Comment #5 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:50b5877925ef5ae8e9f913d6d2b5ce0204ebc588

commit r12-2837-g50b5877925ef5ae8e9f913d6d2b5ce0204ebc588
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Tue Aug 10 12:38:00 2021 +0200

    i386: Allow some V32HImode and V64QImode permutations even without AVX5=
12BW
[PR80355]

    When working on the PR, I've noticed we generate terrible code for
    V32HImode or V64QImode permutations for -mavx512f -mno-avx512bw.
    Generally we can't do much with such permutations, but since PR68655
    we can handle at least some, those expressible using V16SImode or V8DIm=
ode
    permutations, but that wasn't reachable, because
ix86_vectorize_vec_perm_const
    didn't even try, it said without TARGET_AVX512BW it can't do anything, =
and
    with it can do everything, no d.testing_p attempts.

    This patch makes it try it for TARGET_AVX512F && !TARGET_AVX512BW.

    The first hunk is to avoid ICE, expand_vec_perm_even_odd_1 asserts d->v=
mode
    isn't V32HImode because expand_vec_perm_1 for AVX512BW handles already
    all permutations, but when we let it through without !TARGET_AVX512BW,
    expand_vec_perm_1 doesn't handle it.

    If we want, that hunk can be dropped if we implement in
    expand_vec_perm_even_odd_1 and its helper the even permutation as
    vpmovdw + vpmovdw + vinserti64x4 and odd permutation as
    vpsrld $16 + vpsrld $16 + vpmovdw + vpmovdw + vinserti64x4.

    2021-08-10  Jakub Jelinek  <jakub@redhat.com>

            PR target/80355
            * config/i386/i386-expand.c (expand_vec_perm_even_odd): Return
false
            for V32HImode if !TARGET_AVX512BW.
            (ix86_vectorize_vec_perm_const) <case E_V32HImode, case
E_V64QImode>:
            If !TARGET_AVX512BW and TARGET_AVX512F and d.testing_p, don't f=
ail
            early, but actually check the permutation.

            * gcc.target/i386/avx512f-pr80355-2.c: New test.=