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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/103066] __sync_val_compare_and_swap/__sync_bool_compare_and_swap aren't optimized
Date: Fri, 05 Nov 2021 11:57:12 +0000 [thread overview]
Message-ID: <bug-103066-4-QLDAN8H78E@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-103066-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103066
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-11-05
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Hongyu Wang from comment #1)
> __sync_val_compare_and_swap will be expanded to
> atomic_compare_exchange_strong
> by default, should we restrict the check and return under
> atomic_compare_exchange_weak which is allowed to fail spuriously?
On x86, "lock cmpxchgl" can fail.
next prev parent reply other threads:[~2021-11-05 11:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-03 17:35 [Bug target/103066] New: " hjl.tools at gmail dot com
2021-11-05 5:57 ` [Bug target/103066] " wwwhhhyyy333 at gmail dot com
2021-11-05 11:57 ` hjl.tools at gmail dot com [this message]
2021-11-05 12:17 ` jakub at gcc dot gnu.org
2021-11-05 12:33 ` hjl.tools at gmail dot com
2021-11-05 12:44 ` jakub at gcc dot gnu.org
2021-11-05 12:55 ` jakub at gcc dot gnu.org
2021-11-05 13:07 ` hjl.tools at gmail dot com
2021-11-05 13:25 ` jakub at gcc dot gnu.org
2021-11-05 17:40 ` redi at gcc dot gnu.org
2021-11-06 16:31 ` thiago at kde dot org
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