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 407883858D35; Mon,  4 May 2020 06:30:17 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 407883858D35
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1588573817;
 bh=J4gElx/7Mj6QtZFw8VBiAQEsMNDwKdugQEktQ2m4kC8=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=EComcQ3DB8aYTNM1BrXkHSuhQMyqUmCqdvmvMSfN6tK+Khj9fx/JAoTqWZjNiVy5y
 lXRJxAZF4rz2ECkptkTu8q/heQRMBmv7mXuuy/DC0/l7TtgmMXpvjenUfah7EpeZzb
 URsGsv1ae6s1MvxQRrwN0ZLnpYKDTgeCRCZPhi9c=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94908] Failure to optimally optimize certain
 shuffle patterns
Date: Mon, 04 May 2020 06:30:17 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 10.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
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: bug_status cf_reconfirmed_on everconfirmed
Message-ID: <bug-94908-4-rF2gXY6d5G@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-94908-4@http.gcc.gnu.org/bugzilla/>
References: <bug-94908-4@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: <http://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: <http://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 04 May 2020 06:30:17 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94908

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-05-04
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, ideally it would be extract g()[1], insert at a[0].  But yes, we're not
trying to split an not handled suffle into two but leave that for targets
to sort out ... (x86 has code for many 3-insn shuffles for example).=