[Bug tree-optimization/102087] New: ICE on valid code at -O3 on x86_64-linux-gnu: in determine_exit_conditions, at tree-ssa-loop-manip.c:1049

["zhendong.su at inf dot ethz.ch" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102087

            Bug ID: 102087
           Summary: ICE on valid code at -O3 on x86_64-linux-gnu: in
                    determine_exit_conditions, at
                    tree-ssa-loop-manip.c:1049
           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: ---

[540] % 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/12.0.0/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 --enable-multilib --with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.0 20210826 (experimental) [master revision
352d5e85a70:96f76144c4d:5a6c626710ad2ac4baa2dba02fac0750177e3305] (GCC)
[541] %
[541] % gcctk -O2 small.c
[542] %
[542] % gcctk -O3 small.c
during GIMPLE pass: unrolljam
small.c: In function ‘main’:
small.c:4:5: internal compiler error: in determine_exit_conditions, at
tree-ssa-loop-manip.c:1049
    4 | int main() {
      |     ^~~~
0xfe4bea determine_exit_conditions
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:1049
0xfe4bea tree_transform_and_unroll_loop(loop*, unsigned int, edge_def*,
tree_niter_desc*, void (*)(loop*, void*), void*)
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.c:1253
0x19ed2eb tree_loop_unroll_and_jam
        ../../gcc-trunk/gcc/gimple-loop-jam.c:590
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[543] %
[543] % cat small.c
volatile int a[1];
unsigned b;
int c;
int main() {
  int d;
  for (; b > 1; b++)
    for (c = 0; c < 2; c++)
      for (d = 0; d < 2; d++)
        a[0];
  return 0;
}