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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] Failure to use csinv instead of
 mvn+csel where possible
Date: Thu, 04 May 2023 05:37:33 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104357

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> One thing I should note:
>   _7 =3D x_3(D) >=3D 0;
>   _6 =3D (unsigned char) _7;
>   _8 =3D -_6;
>=20
> Should be done on the gimple level as:
> t =3D x_3(D) >> (sizeof(x_3(D))*8 - 1)
> _8 =3D (unsigned char)t;

Actually it is:
  _2 =3D x_3(D) >> 31;
  _5 =3D ~_2;
  _8 =3D (unsigned char) _5;=