linux-kernel - Re: Linux 3.1-rc9

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Message-ID: <20111018060104.GA16304@elte.hu>
Date:	Tue, 18 Oct 2011 08:01:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
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


* H. Peter Anvin <hpa@...or.com> wrote:

> 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. [...]

Yeah - the second pseudocode i gave will do that with no errors.

> [...] We have 32*32 = 64 multiplication on all 32-bit platforms I'm 
> 99.9% sure.

Good.

Thanks,

	Ingo
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