[Bug tree-optimization/112585] New: wrong code at -O3 on x86_64-linux-gnu

[zhendong.su at inf dot ethz.ch via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112585

            Bug ID: 112585
           Summary: wrong code at -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: ---

This appears to be a recent regression as it does not reproduce with 13.2. 

Compiler Explorer: https://godbolt.org/z/ec94Yo6To


[563] % 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/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 --enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20231117 (experimental) (GCC) 
[564] % 
[564] % gcctk -O2 small.c; ./a.out
[565] % 
[565] % gcctk -O3 small.c
[566] % ./a.out
Aborted
[567] % 
[567] % cat small.c
static int a[10], b;
char c, *d = &c, e;
int main() {
  int f = 0;
  for (; f < 9; f++) {
    a[f] = 1;
    a[f + 1] = e;
    for (b = 0; b < 8; b++)
      *d = 0;
  }
  if (a[2] != 1)
    __builtin_abort();
  return 0;
}