[Bug tree-optimization/102958] std::u8string suboptimal compared to std::string, triggers warnings

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102958

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-11-25
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, interesting we don't detect this as strlen:
  <bb 3> [local count: 8687547547]:
  # __i_155 = PHI <__i_46(3), 0(2)>
  __i_46 = __i_155 + 1;
  _48 = MEM[(const char_type &)"123456789" + __i_46 * 1];
  if (_48 != 0)
    goto <bb 3>; [89.00%]
  else
    goto <bb 4>; [11.00%]

I thought there was code to do that dection now?