[Bug middle-end/113726] sanitizer reports signed overflow but not underflow for constant folding case

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113726

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|sanitizer                   |middle-end
            Summary|sanitizer reports signed    |sanitizer reports signed
                   |overflow but not underflow  |overflow but not underflow
                   |                            |for constant folding case
      Known to fail|                            |14.0, 5.1.0
   Last reconfirmed|                            |2024-02-02
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. It is constant folding ...

Reduced testcase:
```

int main() {
    long result = (-__LONG_MAX__ - 1);
    result -= 1l; // sanitizer reports this 
    result = (-__LONG_MAX__ - 1) - 1; // But NOT this
    __builtin_printf("%ld\n", result);
}

```