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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/105983] Failure to optimize (b != 0) && (a >=
 b) as well as the same pattern with binary and
Date: Wed, 15 Jun 2022 12:26:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105983

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
On generic, what opimizes this is:
/* y =3D=3D XXX_MIN || x < y --> x <=3D y - 1 */
(simplify
 (bit_ior:c (eq:s @1 min_value) (lt:s @0 @1))
  (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
       && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
  (le @0 (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))

/* y !=3D XXX_MIN && x >=3D y --> x > y - 1 */
(simplify
 (bit_and:c (ne:s @1 min_value) (ge:s @0 @1))
  (if (INTEGRAL_TYPE_P (TREE_TYPE (@1))
       && TYPE_OVERFLOW_WRAPS (TREE_TYPE (@1)))
  (gt @0 (minus @1 { build_int_cst (TREE_TYPE (@1), 1); }))))
in match.pd when & is used instead of &&.=