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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/100864] (a&!b) | b is not opimized to a | b
 for comparisons
Date: Wed, 02 Jun 2021 02:05:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100864

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I have a patch,
(for bitop (bit_and bit_ior)
     rbitop (bit_ior bit_and)
....
 /* Similar but for comparisons which have been inverted already,
    Note it is hard to similulate inverted tcc_comparison due to NaNs
    so a double for loop is needed and then compare the inverse code
    with the result of invert_tree_comparison is needed.  */
 (for cmp (tcc_comparison)
  (for icmp (tcc_comparison)
   (simplify
    (bitop:c (rbitop:c (icmp @0 @1) @2) (cmp@3 @0 @1))
     (with { enum tree_code ic =3D invert_tree_comparison
             (cmp, HONOR_NANS (@0)); }
      (if (ic =3D=3D icmp)
       (bitop @3 @2)))))))

It is more complex than I had liked but it does solve the issue. There is no
way really of simplifying the pattern either, just because of the way match=
.pd
works :(=