[Bug target/115671] New: wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu

[Bug target/115671] New: wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu

[zhendong.su at inf dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115671

            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. 

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

[648] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/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=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240626 (experimental) (GCC) 
[649] % 
[649] % gcctk -O1 small.c; ./a.out
[650] % 
[650] % gcctk -O1 -fgcse -fno-inline -fschedule-insns small.c
[651] % ./a.out
Aborted
[652] % 
[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 = g(a, e);
    c = l < a;
    e = j(f[1 + b], 2);
    d = a || d;
    if (j(0, 1))
      return;
  }
}
int main() {
  k();
  if (c != 0)
    __builtin_abort();
  return 0;
}

[Bug target/115671] wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115671

Sam James <sjames at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sjames at gcc dot gnu.org

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
I can't reproduce this with a GCC patched for PR115661.

[Bug target/115671] [15 Regression] wrong code at -O1 with "-fgcse -fno-inline -fschedule-insns" on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115671

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |15.0
   Target Milestone|---                         |15.0
             Target|                            |x86_64-*-*
            Summary|wrong code at -O1 with      |[15 Regression] wrong code
                   |"-fgcse -fno-inline         |at -O1 with "-fgcse
                   |-fschedule-insns" on        |-fno-inline
                   |x86_64-linux-gnu            |-fschedule-insns" on
                   |                            |x86_64-linux-gnu