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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/95924] Failure to optimize some bit magic to
 one of the operands
Date: Sun, 25 Jul 2021 04:53:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95924

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
                 CC|                            |pinskia at gcc dot gnu.org
   Last reconfirmed|                            |2021-07-25

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

I have a few patches which improve this but the following still needs to be
done:

  _3 =3D (int) a_9(D);
  _4 =3D ~_3;
  _5 =3D (int) b_8(D);
  _6 =3D _4 & _5;
  _7 =3D _6 =3D=3D 0;

To:
 _3 =3D ~a_9(D)
 _7 =3D b_8(D) & _3=