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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/104357] [Aarch64] Failure to use csinv
 instead of mvn+csel where possible
Date: Thu, 03 Feb 2022 00:02:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104357

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
One thing I should note:
  _7 =3D x_3(D) >=3D 0;
  _6 =3D (unsigned char) _7;
  _8 =3D -_6;

Should be done on the gimple level as:
t =3D x_3(D) >> (sizeof(x_3(D))*8 - 1)
_8 =3D (unsigned char)t;

And then we can factor out the cast and I think it will produce the same co=
de.

And yes it does, that is:
unsigned char stbi__clamp(int x)
{
   int t =3D x;
   if ((unsigned)x > 255) {
      t =3D x >> 31;
   }
   return t;
}

So Mine for GCC 13.=