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 8DEB33858015; Fri, 15 Oct 2021 10:19:02 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8DEB33858015
From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/102769] wrong code at -O1 and above on
 x86_64-linux-gnu
Date: Fri, 15 Oct 2021 10:19:02 +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: unknown
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: zhendong.su at inf dot ethz.ch
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: INVALID
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-102769-4-hu22OudiG7@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-102769-4@http.gcc.gnu.org/bugzilla/>
References: <bug-102769-4@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, 15 Oct 2021 10:19:02 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102769

--- Comment #2 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
Interesting --- it was missed by clang-10 sanitizers and the CompCert
interpreter (a pretty rare occurrence):=20

[565] % ccomp -interp -fall small.c
small.c:13: warning: implicit declaration of function '__builtin_abort' is
invalid in C99 [-Wimplicit-function-declaration]
small.c:13: warning: '__builtin_abort' is declared without a function proto=
type
Time 114: program terminated (exit code =3D 0)
[566] % clang-10 -Xclang -disable-llvm-optzns -w -m64 -O0 -fwrapv -ftrapv
-fsanitize=3Dundefined,address small.c; ./a.out
[567] % clang-10 -pie -fPIE -pie -Xclang -disable-llvm-optzns -w -O0 -m64
-fsanitize=3Dmemory small.c; ./a.out
[568] %=