[Bug tree-optimization/97838] New: ICE at -O3 on x86_64-pc-linux-gnu: Segmentation fault

[zhendong.su at inf dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97838

            Bug ID: 97838
           Summary: ICE at -O3 on x86_64-pc-linux-gnu: Segmentation fault
           Product: gcc
           Version: 11.0
            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: ---

[530] % 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/11.0.0/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 11.0.0 20201115 (experimental) [master revision
406b452dc0e:d88ff5a679d:faab61b585a8b4a42454f085dd6b7815992a98f5] (GCC)
[531] %
[531] % gcctk -O2 -c small.c
[532] %
[532] % gcctk -O3 -c small.c
during GIMPLE pass: vect
small.c: In function ‘f’:
small.c:3:6: internal compiler error: Segmentation fault
    3 | void f() {
      |      ^
0xd0426f crash_signal
        ../../gcc-trunk/gcc/toplev.c:330
0x1006810 auto_vec<int, 0ul>::auto_vec()
        ../../gcc-trunk/gcc/vec.h:1540
0x1006810 vect_optimize_slp(vec_info*)
        ../../gcc-trunk/gcc/tree-vect-slp.c:2702
0xfea9c7 vect_analyze_loop_2
        ../../gcc-trunk/gcc/tree-vect-loop.c:2300
0xfea9c7 vect_analyze_loop(loop*, vec_info_shared*)
        ../../gcc-trunk/gcc/tree-vect-loop.c:2895
0x1015dbc try_vectorize_loop_1
        ../../gcc-trunk/gcc/tree-vectorizer.c:995
0x1016949 vectorize_loops()
        ../../gcc-trunk/gcc/tree-vectorizer.c:1229
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.
[533] %
[533] % cat small.c
int a, b, c, d;

void f() {
  while (c++) {
    int e = -1;
    d = a ? e / a : e;
    b ^= ~d;
  }
}