[Bug tree-optimization/123402] [16 Regression] Annoying warnings for weeks using gcc trunk and format() and -O2 and -Wall

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123402

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
  D.133866._M_current = &MEM <const char32_t[1]> [(void *)&__arr + 4B];
  __first._M_current = &__arr;
  __first = __first;
  __it = D.133866;
  __last = D.133866;
  MEM <const char32_t *> [(struct _First_and_curr *)&D.124344] = &__arr;
  MEM <const char32_t *> [(struct _First_and_curr *)&D.124344 + 8B] = &MEM
<const char32_t[1]> [(void *)&__arr + 4B];
  D.124344._M_last = __last;
  D.124344._M_buf_index = 0;
  D.124344._M_buf_last = 0;
  D.124344._M_to_increment = 0;
  _126 = MEM[(const char32_t * const &)&D.124344 + 16];
  if (_126 != &MEM <const char32_t[1]> [(void *)&__arr + 4B])
```

Where I have seen this before ...