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From: "zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/110391] [12/13/14 Regression] wrong code at
 -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on
 x86_64-linux-gnu
Date: Mon, 26 Jun 2023 09:12:15 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: wrong-code
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X-Bugzilla-Who: zhendong.su at inf dot ethz.ch
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110391

--- Comment #2 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
A likely related reproducer that affects 10.* and later.=20

Compiler Explorer: https://godbolt.org/z/KP6PnTKPj

[579] % 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 20230625 (experimental) [master r14-924-gd709841ae0f] (G=
CC)=20
[580] %=20
[580] % gcctk -O2 -fsel-sched-pipelining -fschedule-insns
-fselective-scheduling2 small.c
[581] % ./a.out
Floating point exception
[582] %=20
[582] % gcctk -O2 small.c; ./a.out
[583] %=20
[583] % cat small.c
int printf(const char *, ...);
int a, d, e =3D -2;
char b;
long c =3D -2;
int main() {
  int g, h;
  d =3D e;
  g =3D c;
 L:
  h =3D d;
  c =3D 1;
  d =3D c % ~e;
  e =3D e >> ~g;
  if (e > b)
    printf("%ld", c);
  if (g > c)
    printf("%d", a);
  if (b)
    goto L;
  e =3D h;
  return 0;
}=