[Bug tree-optimization/107935] New: ICE on valid code at -O3: in set_ssa_val_to, at tree-ssa-sccvn.cc:5011

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107935

            Bug ID: 107935
           Summary: ICE on valid code at -O3: in set_ssa_val_to, at
                    tree-ssa-sccvn.cc:5011
           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 from 12.2. 

Compiler Explorer: https://godbolt.org/z/dcTPb13on

[550] % 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/13.0.0/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
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221130 (experimental) [master r13-4400-g84046b192e5] (GCC) 
[551] % 
[551] % gcctk -O2 small.c; ./a.out
[552] % 
[552] % gcctk -O3 small.c
during GIMPLE pass: fre
small.c: In function ‘main’:
small.c:2:5: internal compiler error: in set_ssa_val_to, at
tree-ssa-sccvn.cc:5011
    2 | int main() {
      |     ^~~~
0x7773f7 set_ssa_val_to
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:5011
0x10b0358 visit_phi
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:5962
0x10bbd8a process_bb
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:7721
0x10bd6b2 do_rpo_vn_1
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:8417
0x10beef6 execute
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:8575
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.
[553] % 
[553] % cat small.c
int *a, **b;
int main() {
  int d = 0, *e = &d;
 L:
  *e = d;
  if (a) {
    int *g = e = *b;
    if (!e)
      __builtin_abort();
    if (**b)
      return 0;
    *g = 1;
    goto L;
  }
  return 0;
}