[Bug middle-end/111805] suboptimal codegen of variant

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111805

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-10-14
          Component|c++                         |middle-end

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Anyways we have:
  __builtin_memcpy (&v.D.38438._M_local_buf, "abc", 3);
  _5 = &MEM[(struct basic_string *)_3(D)].D.38438._M_local_buf;
  MEM[(struct _Alloc_hider *)_3(D)]._M_p = _5;
  __builtin_memcpy (_5, &v.D.38438._M_local_buf, 3);
  MEM[(struct basic_string *)_3(D)]._M_string_length = 3;
  MEM[(char_type &)_3(D) + 19] = 0;

If we able to remove the first memcpy things would be just work I think ...