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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/90838] Detect table-based ctz implementation
Date: Fri, 17 Feb 2023 02:44:25 +0000	[thread overview]
Message-ID: <bug-90838-4-Em53TTlyse@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-90838-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90838

--- Comment #13 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Gabriel Ravier from comment #12)
> It appears this new optimization is non-functional on trunk with x86-64...
> specifically on x86-64, too, on AArch64 it works just fine. So does that
> mean this bug should be re-opened or should a new bug be opened for that ?

It does work with -mbmi where the instruction which is used has a defined value
at 0.
You can open a new issue for improvement of the case for not supplying -mbmi .
That is CTZ_DEFINED_VALUE_AT_ZERO is non-2.

  parent reply	other threads:[~2023-02-17  2:44 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-90838-4@http.gcc.gnu.org/bugzilla/>
2019-06-11 22:47 ` wdijkstr at arm dot com
2023-02-17  2:20 ` gabravier at gmail dot com
2023-02-17  2:44 ` pinskia at gcc dot gnu.org [this message]
2023-02-17 10:34 ` jakub at gcc dot gnu.org
2023-02-17 12:57 ` wilco at gcc dot gnu.org
2023-02-17 13:03 ` jakub at gcc dot gnu.org
2023-02-17 14:27 ` wilco at gcc dot gnu.org
2023-02-17 14:33 ` jakub at gcc dot gnu.org
2023-02-17 14:41 ` gabravier at gmail dot com
2023-02-17 14:45 ` jakub at gcc dot gnu.org
2023-02-17 16:32 ` wilco at gcc dot gnu.org

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