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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/114666] [14 Regression] Signed single bit
 comparison miscompile at -O2
Date: Tue, 09 Apr 2024 21:03:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114666

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the other pattern which uses logical_inverted_value where it depends on
the type does:

/* -(type)!A -> (type)A - 1.  */
(simplify
 (negate (convert?:s (logical_inverted_value:s @0)))
 (if (INTEGRAL_TYPE_P (type)
      && TREE_CODE (type) !=3D BOOLEAN_TYPE
      && TYPE_PRECISION (type) > 1
      && TREE_CODE (@0) =3D=3D SSA_NAME
      && ssa_name_has_boolean_range (@0))
  (plus (convert:type @0) { build_all_ones_cst (type); })))

But that is ok because of the check of >1 for precision. The other one deal=
ing
with cond is a problem there.=