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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111805] suboptimal codegen of variant<string, bool>
Date: Sat, 14 Oct 2023 15:36:55 +0000
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X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111805

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 =3D &MEM[(struct basic_string *)_3(D)].D.38438._M_local_buf;
  MEM[(struct _Alloc_hider *)_3(D)]._M_p =3D _5;
  __builtin_memcpy (_5, &v.D.38438._M_local_buf, 3);
  MEM[(struct basic_string *)_3(D)]._M_string_length =3D 3;
  MEM[(char_type &)_3(D) + 19] =3D 0;

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