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 55EBF388F066; Mon, 29 Jun 2020 12:12:48 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 55EBF388F066
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1593432768;
 bh=SA70CLjawD29Kjxd66ek13yykoo8iZcGFvspkjneRdw=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=m5XOUKKzU/4Vdba+BrbF0WFtKboQ4G/A3KV8lXCSAffMy5+3YAamVfQ2fxLXBCDYc
 QzgfUzzc0rciODHe3jGfVyCaN0X9BDhV1ZKBLnqEKh+n7msa34d4D4lIcqI3+qwRBq
 Ptc83rOgIlovKoXnkaHqBZCNifu+JPIUVpXXSfPs=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/95960] GCC should re-vectorize vector code
 with larger VF
Date: Mon, 29 Jun 2020 12:12:48 +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: 11.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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: attachments.created
Message-ID: <bug-95960-4-2lC42IqPUS@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-95960-4@http.gcc.gnu.org/bugzilla/>
References: <bug-95960-4@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, 29 Jun 2020 12:12:48 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95960

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 48801
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D48801&action=3Dedit
start

So quick experiments show where we need to do adjustments.  We do have
an explicit SLP_TREE_LANES we could use for "true" scalar lanes as compared
to the number of "scalar" stmts but uses might have been transitioned not
exactly along this boundary.  Then there's of course 'group_size' which
can mean either depending on context.

The biggest churn is likely in dataref group analysis where we IMHO
also want a "lanes" representation.=