[Bug tree-optimization/109689] New: ICE at -O1 with "-ftree-vectorize": in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:645

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109689

            Bug ID: 109689
           Summary: ICE at -O1 with "-ftree-vectorize": in
                    check_loop_closed_ssa_def, at
                    tree-ssa-loop-manip.cc:645
           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 very recent regression.

Compiler Explorer: https://godbolt.org/z/nv9dPa1Y7

[629] % 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
--prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++
--disable-werror --disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230501 (experimental) (GCC)
[630] %
[630] % gcctk -O1 -ftree-vectorize small.c
during GIMPLE pass: ch_vect
small.c: In function ‘main’:
small.c:2:5: internal compiler error: in check_loop_closed_ssa_def, at
tree-ssa-loop-manip.cc:645
    2 | int main() {
      |     ^~~~
0x822c59 check_loop_closed_ssa_def
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:645
0x11cfc34 check_loop_closed_ssa_bb
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:659
0x11d18be verify_loop_closed_ssa(bool, loop*)
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:695
0x11d18be verify_loop_closed_ssa(bool, loop*)
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:679
0xf243f9 execute_function_todo
        ../../gcc-trunk/gcc/passes.cc:2116
0xf24bfe execute_todo
        ../../gcc-trunk/gcc/passes.cc:2152
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[631] %
[631] % cat small.c
int a, b, c, d, e;
int main() {
  char f;
  while (a) {
    int g, h = 3;
    if (b)
    i:
      if (d)
        goto j;
  k:
    if (a) {
    j:
      if (!g)
        goto k;
      if (e) {
        while (e)
          e = f;
        h = 0;
        goto i;
      }
      if (!h)
        for (; g < 1; g++)
          ;
      g = ~((~c & h & c) ^ ~g);
      if (!g)
        for (; a < 1; a++)
          f++;
    }
  }
  return 0;
}