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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	[thread overview]
Message-ID: <bug-110391-4-gW7LEvz140@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-110391-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110391

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

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

[579] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../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=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230625 (experimental) [master r14-924-gd709841ae0f] (GCC) 
[580] % 
[580] % gcctk -O2 -fsel-sched-pipelining -fschedule-insns
-fselective-scheduling2 small.c
[581] % ./a.out
Floating point exception
[582] % 
[582] % gcctk -O2 small.c; ./a.out
[583] % 
[583] % cat small.c
int printf(const char *, ...);
int a, d, e = -2;
char b;
long c = -2;
int main() {
  int g, h;
  d = e;
  g = c;
 L:
  h = d;
  c = 1;
  d = c % ~e;
  e = e >> ~g;
  if (e > b)
    printf("%ld", c);
  if (g > c)
    printf("%d", a);
  if (b)
    goto L;
  e = h;
  return 0;
}

  parent reply	other threads:[~2023-06-26  9:12 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-24 13:17 [Bug rtl-optimization/110391] New: wrong code at -O2 and -O3 with "on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-06-24 13:20 ` [Bug rtl-optimization/110391] wrong code at -O2 and -O3 with "-fsel-sched-pipelining -fselective-scheduling2" on x86_64-linux-gnu zhendong.su at inf dot ethz.ch
2023-06-24 15:23 ` [Bug rtl-optimization/110391] [12/13/14 Regression] " pinskia at gcc dot gnu.org
2023-06-26  9:12 ` zhendong.su at inf dot ethz.ch [this message]
2023-06-29  9:18 ` zhendong.su at inf dot ethz.ch
2023-06-29 17:33 ` zhendong.su at inf dot ethz.ch
2024-03-04  1:49 ` law at gcc dot gnu.org

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