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 985433857C79; Thu,  2 Dec 2021 09:14:02 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 985433857C79
From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103300] [12 Regression] wrong code at -O3 on
 x86_64-linux-gnu since r12-4526-gd8edfadfc7a9795b
Date: Thu, 02 Dec 2021 09:14:02 +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: 12.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: marxin at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P1
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 12.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-103300-4-bx5ieV3bTY@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-103300-4@http.gcc.gnu.org/bugzilla/>
References: <bug-103300-4@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, 02 Dec 2021 09:14:02 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103300

--- Comment #7 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
(In reply to Zhendong Su from comment #6)
> Another test likely for the same issue:
>=20
> [652] % gcctk -O3 small.c; ./a.out
> Aborted
> [653] % gcctk -O2 -floop-unroll-and-jam small.c; ./a.out
> Aborted
> [654] % cat small.c
> int printf(const char *, ...);
> int a[2], b, c, d, e;
> int main() {
>   if (b) {
>     printf("0");
>     goto L2;
>   }
> L1:
>   b =3D 0;
> L2:
>   if (d)
>   L3:
>     goto L1;
>   if (e)
>     goto L3;
>   if (c)
>     goto L2;
>   for (b =3D 0; b < 3; b++)
>     for (d =3D 0; d < 2; d++)
>       a[d] ^=3D 1;
>   if (a[1] !=3D 1)
>     __builtin_abort();
>   return 0;
> }

Yes, started with the same revision.=