[Bug tree-optimization/117859] New: ICE on valid code at -O{2,3} with "-fno-ssa-phiopt -fno-expensive-optimization": Segmentation fault

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117859

            Bug ID: 117859
           Summary: ICE on valid code at -O{2,3} with "-fno-ssa-phiopt
                    -fno-expensive-optimization": Segmentation fault
           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 recent regression as it doesn't reproduce with 14.2 and
earlier.

Compiler Explorer: https://godbolt.org/z/rz7fehsbW

[679] % 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 20241129 (experimental) (GCC) 
[680] % 
[680] % gcctk -O2 -fno-ssa-phiopt -fno-expensive-optimizations small.c
gcctk: internal compiler error: Segmentation fault signal terminated program
cc1
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.
[681] % 
[681] % cat small.c
unsigned char a;
int b, c, d, e, g, h, j, k;
struct {
  int f : 1;
} i;
char l(int m) { return a > 255 >> m ? 0 : m; }
int main() {
  if (i.f)
    d = b;
  k = e = 1;
  for (; e; e--)
    g = 0;
  h = g ? 1 << g : 1;
  c = h || i.f;
  while (b)
    j = l(k && i.f);
  return 0;
}