[Bug tree-optimization/110116] New: ICE on valid code at -O3 on x86_64-linux-gnu: verify_gimple failed

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110116

            Bug ID: 110116
           Summary: ICE on valid code at -O3 on x86_64-linux-gnu:
                    verify_gimple failed
           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.

Compiler Explorer: https://godbolt.org/z/MTsfTocn7

[635] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../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
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230604 (experimental) [master r14-924-gd709841ae0f] (GCC)
[636] %
[636] % gcctk -O3 small.c
small.c: In function ‘main’:
small.c:6:21: warning: iteration 2147483646 invokes undefined behavior
[-Waggressive-loop-optimizations]
    6 |     for (b = 1; b; b++)
      |                    ~^~
small.c:6:17: note: within this loop
    6 |     for (b = 1; b; b++)
      |                 ^
small.c:4:5: error: type mismatch in binary expression
    4 | int main() {
      |     ^~~~
vector(4) char

vector(4) char

vector(4) unsigned char

_73 = vect__48.34_68 & vect__6.22_19;
during GIMPLE pass: reassoc
small.c:4:5: internal compiler error: verify_gimple failed
0x100327e verify_gimple_in_cfg(function*, bool, bool)
        ../../gcc-trunk/gcc/tree-cfg.cc:5652
0xe98674 execute_function_todo
        ../../gcc-trunk/gcc/passes.cc:2098
0xe98bcb 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.
[637] %
[637] % cat small.c
unsigned char a[5];
int b, d;
char c;
int main() {
  if (d) {
    for (b = 1; b; b++)
      c &= d = 1;
    for (; d < 5; d++)
      c &= a[d];
  }
  return 0;
}