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 2D4B73875431; Wed, 26 Jun 2024 21:54:26 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 2D4B73875431
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1719438866;
	bh=ya3NmnT889ubeHD3TmXwLPXMhZAQvhjolmLdl3pL7fY=;
	h=From:To:Subject:Date:From;
	b=d0R1GNuGC1icHCJ8cvUdyanS04GrgDFIDOICVZAuAYk7U1E0jgX6D4qH06lyGTtqh
	 s6cpHNMZ4FJzXKktATl059er6+8IVKYfAsm+DSBA2Z3DC/5cELFeNBUCOkXVJrP8WS
	 kc/FX5Fjnel0vrkMoLS7lxb7FvDd57r+ND4stYVA=
From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/115671] New: wrong code at -O1 with "-fgcse -fno-inline
 -fschedule-insns" on x86_64-linux-gnu
Date: Wed, 26 Jun 2024 21:54:25 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
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-115671-4@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=3D115671

            Bug ID: 115671
           Summary: wrong code at -O1 with "-fgcse -fno-inline
                    -fschedule-insns" on x86_64-linux-gnu
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

It seems to be a recent regression as it doesn't reproduce with 14.1.=20

Compiler Explorer: https://godbolt.org/z/Ev6hsWhE1

[648] % gcctk -v
Using built-in specs.
COLLECT_GCC=3Dgcctk
COLLECT_LTO_WRAPPER=3D/local/suz-local/software/local/gcc-trunk/libexec/gcc=
/x86_64-pc-linux-gnu/15.0.0/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 --enable-mu=
ltilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240626 (experimental) (GCC)=20
[649] %=20
[649] % gcctk -O1 small.c; ./a.out
[650] %=20
[650] % gcctk -O1 -fgcse -fno-inline -fschedule-insns small.c
[651] % ./a.out
Aborted
[652] %=20
[652] % cat small.c
int printf(const char *, ...);
int a, b, c, d, e;
short f[2];
int g(int h, int i) { return 0; }
int j(int h, int i) { return i; }
void k() {
  int l;
  for (; b < 1; b++) {
    l =3D g(a, e);
    c =3D l < a;
    e =3D j(f[1 + b], 2);
    d =3D a || d;
    if (j(0, 1))
      return;
  }
}
int main() {
  k();
  if (c !=3D 0)
    __builtin_abort();
  return 0;
}=