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From: "luoxhu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/83403] Missed register promotion
 opportunities in loop
Date: Tue, 28 Apr 2020 06:27:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D83403

luoxhu at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |luoxhu at gcc dot gnu.org

--- Comment #7 from luoxhu at gcc dot gnu.org ---
int could pass but unsigned will fail to capture the refs independent, draf=
ted
a patch to use the range info when checking the CONVERT expression on
PLUS/MINUS/MULT for wrapping overflow(unsigned).

https://gcc.gnu.org/pipermail/gcc-patches/2020-April/544684.html


(gdb) p debug_aff(&off1)
{
  type =3D sizetype
  offset =3D 8
  elements =3D {
    [0] =3D (long unsigned int) n_93 * 80,
    [1] =3D &C * 1
  }
}
$571 =3D void
(gdb) p debug_aff(&off2)
{
  type =3D sizetype
  offset =3D 0
  elements =3D {
    [0] =3D (long unsigned int) n_93 * 80,
    [1] =3D &C * 1
  }
}

Is this a reasonable solution, please?=