linux-kernel - Re: [PATCH 1/1] GCD: add binary GCD algorithm

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Message-ID: <20140815213209.GM19379@twins.programming.kicks-ass.net>
Date:	Fri, 15 Aug 2014 23:32:09 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	George Spelvin <linux@...izon.com>
Cc:	zhaoxiu.zeng@...il.com, akpm@...ux-foundation.org,
	dhowells@...hat.com, jwboyer@...hat.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	takahiro.akashi@...aro.org
Subject: Re: [PATCH 1/1] GCD: add binary GCD algorithm

On Fri, Aug 15, 2014 at 04:16:01PM -0400, George Spelvin wrote:
> What I'd like is a better way to automatically configure "divide is
> slow" from an architecture.

So the usual thing and have arch/*/Kconfig select the fancy one if it
doesn't have a hardware divide instruction.

For instance:

arch/arm/Kconfig:

config ARM
	...
	select GCD_FANCY_ALGO if CPU_v6

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