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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/95729] Failure to optimize away certain returns when the condition to reach them is a calculation that already results in that value Date: Wed, 17 Nov 2021 09:41:23 +0000 [thread overview] Message-ID: <bug-95729-4-wrvmlYzbXu@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-95729-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95729 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot gnu.org Status|NEW |ASSIGNED --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- ;; a != b ? a - b : 0 Something like: (simplify (cond (ne:c @0 @1) (minus@2 @0 @1) zero_p) (if (!HONOR_NANS (type) && !HONOR_SIGNED_ZEROS (type)) @2) (simplify (cond (eq:c @0 @1) zero_p (minus@2 @0 @1)) (if (!HONOR_NANS (type) && !HONOR_SIGNED_ZEROS (type)) @2) Note I noticed LLVM 13 no longer does this optimization (I wonder if they have a testsuite).
next prev parent reply other threads:[~2021-11-17 9:41 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-06-17 20:17 [Bug tree-optimization/95729] New: " gabravier at gmail dot com 2020-06-17 22:14 ` [Bug tree-optimization/95729] " pinskia at gcc dot gnu.org 2020-06-18 8:39 ` rguenth at gcc dot gnu.org 2021-11-17 9:41 ` pinskia at gcc dot gnu.org [this message] 2023-05-06 23:12 ` pinskia at gcc dot gnu.org
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