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 F1915385E001; Fri, 30 Apr 2021 01:13:30 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F1915385E001
From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/100267] gcc -O2 for avx512 instrincts generates
 extra warnings and less optimizations
Date: Fri, 30 Apr 2021 01:13:30 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 10.2.0
X-Bugzilla-Keywords: diagnostic, missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: crazylht at gmail dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-100267-4-x05i0A3K7R@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-100267-4@http.gcc.gnu.org/bugzilla/>
References: <bug-100267-4@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: Fri, 30 Apr 2021 01:13:31 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100267

--- Comment #5 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #4)
> (In reply to Hongtao.liu from comment #3)
> > After support v{,p}expand* thats w/o mask operands, codegen seems to be
> > optimal
> >=20
>=20
> I was wrong, without mask, it's just simple move.

finally optimized to

 _Z16dummyf1_avx512x8PK11flow_avx512:
.LFB5665:
        .cfi_startproc
        movl    (%rdi), %edx
        movq    8(%rdi), %rax
        vmovdqu (%rax,%rdx,8), %ymm0
        vmovdqu 32(%rax,%rdx,8), %ymm1
        vpaddq  %ymm1, %ymm0, %ymm0
        ret

I'm testing the patch.=