[Bug tree-optimization/107766] [13 Regression] ICE Segmentation fault since r13-4137-gc5df8392c5848c04

[slyfox at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107766

--- Comment #3 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Posting example from PR107789 here in unlikely case it's a slightly different
problem:

$ cat a.c.c
long ga, gb, gc, gd;
unsigned long ge, gf;
int gh;
int bug(void) {
  gf = gb ? ga : 0;
  gf -= gh * ge;
  gc += gd * ge;
  if (gf)
    gc += gf;
  return 0;
}

Crashes as:

$ gcc -std=c99 -O2 -c a.c.c -o a.o -O2

during GIMPLE pass: slp
a.c.c: In function 'bug':
a.c.c:4:5: internal compiler error: Segmentation fault
    4 | int bug(void) {
      |     ^~~
0x1ae8c54 diagnostic_impl(rich_location*, diagnostic_metadata const*, int, char
const*, __va_list_tag (*) [1], diagnostic_t)
        ???:0
0x1ae98a6 internal_error(char const*, ...)
        ???:0
0xcb2b3f crash_signal(int)
        ???:0
0xf194b7 complex_mul_pattern::matches(...