linux-kernel - Re: [PATCH] ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in exponential backoff

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Message-ID: <20150807105951.GG16853@twins.programming.kicks-ass.net>
Date:	Fri, 7 Aug 2015 12:59:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARCv2: spinlock/rwlock/atomics: reduce 1 instruction in
 exponential backoff

On Fri, Aug 07, 2015 at 01:52:19PM +0530, Vineet Gupta wrote:
> The increment of delay counter was 2 instructions:
> Arithmatic Shfit Left (ASL) + set to 1 on overflow
> 
> This can be done in 1 using ROtate Left (ROL)

Cute :-)
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