[Bug middle-end/102403] [12 Regression] ICE in in init_from_control_deps, at gimple-predicate-analysis.cc:2364

[zhendong.su at inf dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102403

Zhendong Su <zhendong.su at inf dot ethz.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zhendong.su at inf dot ethz.ch

--- Comment #2 from Zhendong Su <zhendong.su at inf dot ethz.ch> ---
Another repro:

[603] % 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 20210919 (experimental) [master r12-3660-ge9e46864cd0] (GCC)
[604] %
[604] % gcctk -O2 small.c
[605] %
[605] % gcctk -O2 -Wall -Wextra small.c
during GIMPLE pass: uninit
small.c: In function ‘main’:
small.c:6:5: internal compiler error: in init_from_control_deps, at
gimple-predicate-analysis.cc:2364
    6 | int main() {
      |     ^~~~
0x1a93e03 predicate::init_from_control_deps(vec<edge_def*, va_heap, vl_ptr>
const*, unsigned int)
        ../../gcc-trunk/gcc/gimple-predicate-analysis.cc:2364
0x1a954ff predicate::init_from_phi_def(gphi*)
        ../../gcc-trunk/gcc/gimple-predicate-analysis.cc:1829
0x1a989b4 predicate::is_use_guarded(gimple*, basic_block_def*, gphi*, unsigned
int, hash_set<gphi*, false, default_hash_traits<gphi*> >*)
        ../../gcc-trunk/gcc/gimple-predicate-analysis.cc:1874
0x1a99064 predicate::is_use_guarded(gimple*, basic_block_def*, gphi*, unsigned
int)
        ../../gcc-trunk/gcc/gimple-predicate-analysis.cc:1933
0x103df8f find_uninit_use
        ../../gcc-trunk/gcc/tree-ssa-uninit.c:1092
0x103df8f warn_uninitialized_phi
        ../../gcc-trunk/gcc/tree-ssa-uninit.c:1150
0x103df8f execute_late_warn_uninitialized
        ../../gcc-trunk/gcc/tree-ssa-uninit.c:1275
0x103df8f execute
        ../../gcc-trunk/gcc/tree-ssa-uninit.c:1288
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.
[606] %
[606] % cat small.c
int printf(const char *, ...);
int a[1], b, c, d, e, h;
static int f;
long g;
void i() { b = 1 ^ a[b ^ (c & 1)]; }
int main() {
  int j;
  if (!f && ~h) {
    if (g)
      goto L2;
  } else {
    int m = 0;
  L1:
    e = m;
  L2:
    m ^= 1;
    if (d)
      printf("0");
    for (j = 0; j < 10; j++)
      i();
    goto L1;
  }
  return 0;
}