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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/111543] `(a & b) & ~a` could be optimized before reassociation
Date: Sat, 23 Sep 2023 04:26:17 +0000 [thread overview]
Message-ID: <bug-111543-4-a0lT2Y2S0Q@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-111543-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111543
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
/* (X & ~Y) & Y -> 0 */
(simplify
(bit_and:c (bit_and @0 @1) @2)
(with { bool wascmp; }
(if (bitwise_inverted_equal_p (@0, @2, wascmp)
|| bitwise_inverted_equal_p (@1, @2, wascmp))
{ wascmp ? constant_boolean_node (false, type) : build_zero_cst (type); })))
/* (X | ~Y) | Y -> -1 */
(simplify
(bit_ior:c (bit_ior @0 @1) @2)
(with { bool wascmp; }
(if ((bitwise_inverted_equal_p (@0, @2, wascmp)
|| bitwise_inverted_equal_p (@1, @2, wascmp))
&& (!wascmp || element_precision (type) == 1))
{ build_all_ones_cst (TREE_TYPE (@0)); })))
next prev parent reply other threads:[~2023-09-23 4:26 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-22 18:52 [Bug tree-optimization/111543] New: " pinskia at gcc dot gnu.org
2023-09-22 18:56 ` [Bug tree-optimization/111543] " pinskia at gcc dot gnu.org
2023-09-22 18:56 ` pinskia at gcc dot gnu.org
2023-09-23 4:26 ` pinskia at gcc dot gnu.org [this message]
2023-09-23 19:55 ` pinskia at gcc dot gnu.org
2023-09-24 6:48 ` cvs-commit at gcc dot gnu.org
2023-09-24 6:49 ` pinskia at gcc dot gnu.org
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