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 B447B3850404; Thu, 11 Feb 2021 14:49:06 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B447B3850404
From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/96264] [10/11 Regression] wrong code with -Os
 -fno-forward-propagate -fschedule-insns -fno-tree-ter
Date: Thu, 11 Feb 2021 14:49:06 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: seurer at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 10.3
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cf_gcchost cc cf_gccbuild
Message-ID: <bug-96264-4-JalgLUz4qR@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-96264-4@http.gcc.gnu.org/bugzilla/>
References: <bug-96264-4@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: Thu, 11 Feb 2021 14:49:06 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96264

seurer at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
               Host|x86_64-pc-linux-gnu         |x86_64-pc-linux-gnu,
                   |                            |powerpc64le-linux-gnu
                 CC|                            |bergner at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org,
                   |                            |wschmidt at gcc dot gnu.org
              Build|                            |powerpc64le-linux-gnu

--- Comment #5 from seurer at gcc dot gnu.org ---
I too am able to duplicate this on a native powerpc64 LE machine.  Changing
any of the compilation options (-Os -fno-forward-propagate -fschedule-insns
-fno-tree-ter) generates code that works.

The revision that causes it is:

g:a7eb97ad269b6509bd7b31ca373daea98e4d7e85, r10-135

commit a7eb97ad269b6509bd7b31ca373daea98e4d7e85 (HEAD)
Author: Richard Biener <rguenther@suse.de>
Date:   Fri May 3 10:39:56 2019 +0000

    re PR middle-end/88963 (gcc generates terrible code for vectors of 64+
length which are not natively supported)

    2019-05-03  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/88963
            * tree-ssa-forwprop.c (pass_forwprop::execute): Rewrite
            vector loads feeding only BIT_FIELD_REFs to component
            loads.  Rewrite stores fed by CONSTRUCTORs to component
            stores.

            * gcc.dg/tree-ssa/ssa-fre-31.c: Disable forwprop.
            * gcc.target/i386/pr88963-1.c: New testcase.
            * gcc.target/i386/pr88963-2.c: Likewise.

    From-SVN: r270844

I compared the assembler output from r10-134 and r10-135 for the test case =
and
the differences are significant.  Assembler output of the two revisions
attached.=