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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/112683] Optimizing memcpy range by extending to word
 bounds
Date: Thu, 23 Nov 2023 21:21:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112683

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |middle-end

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  # RANGE [irange] long unsigned int [1, 16] MASK 0x1f VALUE 0x0
  _2 =3D _1 + 1;
  # PT =3D nonlocal=20
  _3 =3D &__str_5(D)->_M_local_bufD.4676;
  # .MEM_7 =3D VDEF <.MEM_6>
  memcpyD.1403 (&<retval>._M_local_bufD.4676, _3, _2);

The range information is there already for _2.


Note the hugely expanded out instructions is a target issue though.=