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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 16:28:33 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110992

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is what I have so far:
/* Transform (a * { 0 or 1 }) !=3D 0 into {0 or 1} !=3D 0 & (a !=3D 0) */
/* Transform (a * { 0 or 1 }) =3D=3D 0 into ({0 or 1} =3D=3D 0) | (a =3D=3D=
 0) */
(for cmp (ne eq)
     bit_op (bit_and bit_ior)
 (simplify
  (cmp (mult:cs @0 zero_one_valued_p@1) integer_zerop@2)
  (bit_op (cmp @1 { build_zero_cst (TREE_TYPE (@1)); })
          (cmp @0 @2))))

/* zero_one_valued_p !=3D 0 -> (cast)zero_one_valued_p */
(simplify
 (ne zero_one_valued_p@0 integer_zerop)
 (convert @0))=