[Bug sanitizer/108880] New: slow compilation with "-fsanitize=undefined"

[qrzhang at gatech dot edu via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108880

            Bug ID: 108880
           Summary: slow compilation with "-fsanitize=undefined"
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: qrzhang at gatech dot edu
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at 
gcc dot gnu.org
  Target Milestone: ---

gcc-10 works fine.

$ time gcc-10 -fsanitize=undefined  abc.c

real    0m0.081s


$ time gcc-11 -fsanitize=undefined  abc.c

real    0m7.045s

$ time gcc-trunk -fsanitize=undefined  abc.c

real    0m10.346s

$ gcc-trunk -v
gcc version 13.0.1 20230218 (experimental) [master r13-6132-g32b5875c911] (GCC)


$ cat abc.c
long a;
short b, e;
char c;
int d, f, g;
void h() {
  int i;
  f &= i ^= (((g &= 0 / d / d % 8 << 0 << 2) % a >> e) / c >> b) / 1 % 8 << 3;
}
void main() {}