linux-kernel - Re: Linux 3.1-rc9

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Message-ID: <4E9CA772.4000509@zytor.com>
Date:	Mon, 17 Oct 2011 15:08:50 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Simon Kirby <sim@...tway.ca>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: Linux 3.1-rc9

On 10/17/2011 02:39 PM, Ingo Molnar wrote:
>>
>> We can do much better than that with reciprocal multiplication.  
> 
> Yes, 2^64/1e9 is the reciprocal.
> 

What I mean is that it's pretty easy to work it so it doesn't have the
errors.  We have 32*32 = 64 multiplication on all 32-bit platforms I'm
99.9% sure.

	-hpa

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