[Bug tree-optimization/115925] New: wrong code at -O{2,3} with "-fno-thread-jumps" on x86_64-linux-gnu

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115925

            Bug ID: 115925
           Summary: wrong code at -O{2,3} with "-fno-thread-jumps" 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: ---

It appears to be a regression from 13.*, and affects 14.1 and the trunk. 

Compiler Explorer: https://godbolt.org/z/dThxjfzf3

[521] % 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 20240714 (experimental) (GCC) 
[522] % 
[522] % gcctk -O2 small.c; ./a.out
[523] % 
[523] % gcctk -O2 -fno-thread-jumps small.c
[524] % ./a.out
1
[525] % cat small.c
int printf(const char *, ...);
int a, b, c = 1, d = 1, e, g;
char f;
int main() {
  int h = 10, i;
j:
  if (h < e) {
    printf("%d\n", c);
    return 0;
  }
  i = -1;
  if (d)
    i = h;
  h = b = -2;
  a = (b ^ i) | (c || f);
  if (i <= a)
    g = ~i;
  if (a > 0)
    goto j;
  return 0;
}