On Wed, 16 Nov 2022 at 07:51, Alexander Monakov wrote:
>
>
> On Wed, 16 Nov 2022, Hongyu Wang wrote:
>
> > > When emitting a compare-and-swap loop for @ref{__sync Builtins}
> > > and @ref{__atomic Builtins} lacking a native instruction, optimize
> > > for the highly contended case by issuing an at
> Please use 'git commit --author' to indicate authorship of the patch
> (or simply let me push it once approved).
Yes, just change the author and push it.
Thanks for your help!
On Wed, 16 Nov 2022, Hongyu Wang wrote:
> > When emitting a compare-and-swap loop for @ref{__sync Builtins}
> > and @ref{__atomic Builtins} lacking a native instruction, optimize
> > for the highly contended case by issuing an atomic load before the
> > @code{CMPXCHG} instruction, and using the
issuing an atomic load before the
> @code{CMPXCHG} instruction, and using the @code{PAUSE} instruction
> to save CPU power when restarting the loop.
>
> Alexander
From e82f3e03115480ac3d055819658a107249932c65 Mon Sep 17 00:00:00 2001
From: Hongyu Wang
Date: Tue, 15 Nov 2022 11:16:17 +0800
Subje
On Tue, 15 Nov 2022, Jonathan Wakely wrote:
> > How about the following:
> >
> > When emitting a compare-and-swap loop for @ref{__sync Builtins}
> > and @ref{__atomic Builtins} lacking a native instruction, optimize
> > for the highly contended case by issuing an atomic load before the
> > @code
On Tue, 15 Nov 2022 at 13:34, Alexander Monakov wrote:
>
> On Tue, 15 Nov 2022, Jonathan Wakely via Gcc-patches wrote:
>
> > > @item -mrelax-cmpxchg-loop
> > > @opindex mrelax-cmpxchg-loop
> > >-Relax cmpxchg loop by emitting an early load and compare before cmpxchg,
> > >-execute pause if load va
On Tue, 15 Nov 2022, Jonathan Wakely via Gcc-patches wrote:
> > @item -mrelax-cmpxchg-loop
> > @opindex mrelax-cmpxchg-loop
> >-Relax cmpxchg loop by emitting an early load and compare before cmpxchg,
> >-execute pause if load value is not expected. This reduces excessive
> >-cachline bouncing whe
On 15/11/22 11:35 +0800, Hongyu Wang wrote:
Hi,
According to PR 107676, the document of -mrelax-cmpxchg-loop is nonsensical.
Adjust the wording according to the comments.
Bootstrapped on x86_64-pc-linux-gnu, ok for trunk?
gcc/ChangeLog:
PR target/107676
* doc/invoke.texi: Rewo
Hi,
According to PR 107676, the document of -mrelax-cmpxchg-loop is nonsensical.
Adjust the wording according to the comments.
Bootstrapped on x86_64-pc-linux-gnu, ok for trunk?
gcc/ChangeLog:
PR target/107676
* doc/invoke.texi: Reword the description of
-mrelax-cmpxchg-
