[Bug sanitizer/116031] signed integer overflow check at optimization level -O3

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116031

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  int32_t s;
  int32_t *n = &s;
  uint32_t o = 1912123656;
  c(*n >> (*l + (int32_t)o >= 0));

First off s is uninitialized. So it being 0 is valid and 0 shifted by any value
is still 0 so the overflow add is optimized away.