[Bug middle-end/80399] Premature optimization with unsigned

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80399

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Related case (but I know it goes down a different path) is:
struct ss
{
  int aa;
  int s;
};

int
f(int a, struct ss *rn, int i)
{
  return rn[i-1].s == a;
}

Which shows up in SPEC INT.