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 8C5313858D35; Thu, 22 Jun 2023 14:58:24 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8C5313858D35
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1687445904;
	bh=eKSOKLWcI72iHjcgMS51EqXDjZUraMIBxycBx5OAruM=;
	h=From:To:Subject:Date:From;
	b=qUsK13kok4HLjH/LGQDipEhedVe4ZSua9DvRnBaHltF8ZsAQ//nyb+AHRuhA0USGa
	 kdIjHWG6+VJLAR2t8dQg9ejByLlgc1EU53l7Mz3qjSqca7/wT8+X/NytqwbcYahWdm
	 ih+y96K50AA/merdUMX7tDVSK+UOKjz2Gwx7Quas=
From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/110365] New: wrong code at -O2 and -O3 on
 x86_64-linux-gnu
Date: Thu, 22 Jun 2023 14:58:24 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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: 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: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-110365-4@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
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110365

            Bug ID: 110365
           Summary: wrong code at -O2 and -O3 on x86_64-linux-gnu
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

It appears to be a recent regression.

Compiler Explorer: https://godbolt.org/z/aP9aMrsGq

[725] % gcctk -v
Using built-in specs.
COLLECT_GCC=3Dgcctk
COLLECT_LTO_WRAPPER=3D/local/home/suz/suz-local/software/local/gcc-trunk/bi=
n/../libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=3Dyes --prefix=3D/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=3Dc,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230622 (experimental) [master r14-924-gd709841ae0f] (G=
CC)=20
[726] %=20
[726] % gcctk -O1 small.c; ./a.out
[727] %=20
[727] % gcctk -O2 small.c
[728] % ./a.out
Aborted
[729] %=20
[729] % cat small.c
int a =3D 1;
void b() {
  int *c =3D &a, d =3D a;
  if (a < -1)
    d =3D a + d;
  a =3D d;
  if (a > 0)
    *c =3D 1;
  int e =3D -a;
  if (e < a) {
    e =3D a;
    if (!a)
      __builtin_abort();
  }
  a =3D e;
}
int main() {
  b();
  if (a !=3D 1)
    __builtin_abort();
  return 0;
}=