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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/110992] [13/14 Regression] missed VRP
 optimization due to transformation of `a & -zero_one_valued_p` into `a *
 zero_one_valued_p`
Date: Fri, 15 Sep 2023 03:54:46 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110992

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

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

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
One way of fixing this is:
/* Transform (a * { 0 or 1 }) !=3D/=3D=3D 0 into (a & { 0 or 1 }) !=3D/=3D=
=3D 0.  */
(for cmp (ne eq)
 (simplify
  (cmp (mult:cs @0 zero_one_valued_p@1) integer_zerop@2)
  (cmp (bit_and @0 @1) @2)))

That is (a*zero_one_valued_p)!=3D0 transform it into (a & zero_one_valued_p=
) !=3D 0
if the multiply was single use.

That is how I am going to fix this.=