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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/109959] `(a > 1) ? 0 : (a == 1)` is not
 optimized when spelled out at -O2+
Date: Wed, 07 Jun 2023 22:48:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109959

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> This is basically PR 102138 .

Except it works at -O1 because the cast is pushed out of the phi by phiopt =
but
the cast is the same as a & 1 here :(.

For comment #0 we could just match this for unsigned type
a_2(D) > 1 ? 0 : a_2(D) =3D=3D a_2(D) <=3D 1 ? a_2(D) : 0 -> (unsigned)(a =
=3D=3D 1)

For comment #3 we need to pattern match this now:
  _7 =3D (_Bool) a_6(D);
  _9 =3D a_6(D) <=3D 1;
  _10 =3D _7 & _9;=