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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/98954] ((X << CST0) & CST1) == 0 is not optimized to 0 == (X & (CST1 >> CST0)) Date: Sun, 28 Feb 2021 23:33:57 +0000 [thread overview] Message-ID: <bug-98954-4-xVf7JY2xYS@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-98954-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98954 --- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Created attachment 50271 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50271&action=edit partial patch This is the partial patch (and still need a testcase added too). It fixes: _Bool f(unsigned m) { return !((m << 1) & 0xFF); }
next prev parent reply other threads:[~2021-02-28 23:33 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-03 15:22 [Bug tree-optimization/98954] New: Failure to optimize left shift+and pattern gabravier at gmail dot com 2021-02-28 22:32 ` [Bug tree-optimization/98954] " pinskia at gcc dot gnu.org 2021-02-28 23:32 ` [Bug tree-optimization/98954] ((X << CST0) & CST1) == 0 is not optimized to 0 == (X & (CST1 >> CST0)) pinskia at gcc dot gnu.org 2021-02-28 23:33 ` pinskia at gcc dot gnu.org [this message] 2021-12-01 0:54 ` pinskia at gcc dot gnu.org 2021-12-01 5:49 ` pinskia at gcc dot gnu.org 2022-08-09 17:57 ` cvs-commit at gcc dot gnu.org 2022-08-15 16:41 ` cvs-commit at gcc dot gnu.org 2022-09-10 21:19 ` roger at nextmovesoftware dot com
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