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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/99918] [11/12/13/14 Regression] suboptimal
 code for bool bitfield tests
Date: Wed, 12 Jul 2023 22:05:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99918

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu.org

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Martin Sebor from comment #2)
> Bisection points to r225825 as the revision where GCC started to fail to
> fold the code in g().

the fold-const didn't check `types_match (type, TREE_TYPE (@0))` but rather
just did the equivalent to:
(simplify
 (ne @0 integer_zerop@1)
 (if (TREE_CODE (TREE_TYPE (@0)) =3D=3D BOOLEAN_TYPE)
  (non_lvalue (convert @0))))

While match now does not do the convert and checks the types_match check
instead.=