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From: Mark Rutland <mark.rutland@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org, boqun.feng@gmail.com,
	catalin.marinas@arm.com, will@kernel.org
Subject: Re: [PATCH 5/5] arm64: atomics: lse: define RETURN ops in terms of FETCH ops
Date: Mon, 13 Dec 2021 16:49:46 +0000	[thread overview]
Message-ID: <Ybd5qlyWLmAzm8JI@FVFF77S0Q05N> (raw)
In-Reply-To: <20211210221940.GU16608@worktop.programming.kicks-ass.net>

On Fri, Dec 10, 2021 at 11:19:40PM +0100, Peter Zijlstra wrote:
> On Fri, Dec 10, 2021 at 03:14:10PM +0000, Mark Rutland wrote:
> > The FEAT_LSE atomic instructions include LD* instructions which return
> > the original value of a memory location can be used to directly
> > implement FETCH opertations. Each RETURN op is implemented as a copy of
> > the corresponding FETCH op with a trailing instruction instruction to
> 
> instruction instruction instruction is probably even more better :-)

I've gone the other way and just made that a single `instruction` in the
branch. :)

Mark.

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  reply	other threads:[~2021-12-13 16:51 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-10 15:14 [PATCH 0/5] arm64: atomics: cleanups and codegen improvements Mark Rutland
2021-12-10 15:14 ` [PATCH 1/5] arm64: atomics: format whitespace consistently Mark Rutland
2021-12-13 19:20   ` Will Deacon
2021-12-10 15:14 ` [PATCH 2/5] arm64: atomics lse: define SUBs in terms of ADDs Mark Rutland
2021-12-13 19:27   ` Will Deacon
2021-12-10 15:14 ` [PATCH 3/5] arm64: atomics: lse: define ANDs in terms of ANDNOTs Mark Rutland
2021-12-13 19:29   ` Will Deacon
2021-12-10 15:14 ` [PATCH 4/5] arm64: atomics: lse: improve constraints for simple ops Mark Rutland
2021-12-13 19:40   ` Will Deacon
2021-12-14 13:04     ` Mark Rutland
2021-12-10 15:14 ` [PATCH 5/5] arm64: atomics: lse: define RETURN ops in terms of FETCH ops Mark Rutland
2021-12-10 22:19   ` Peter Zijlstra
2021-12-13 16:49     ` Mark Rutland [this message]
2021-12-13 19:43   ` Will Deacon
2021-12-10 22:26 ` [PATCH 0/5] arm64: atomics: cleanups and codegen improvements Peter Zijlstra
2021-12-14 16:54 ` Catalin Marinas

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