linux-kernel - Re: Linux 3.1-rc9

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Message-ID: <CAMuHMdVRV6jx3Lj27U=xmM8QJWAcrKvLH6o1yTWVM1Ag6XkU-Q@mail.gmail.com>
Date:	Tue, 18 Oct 2011 09:12:20 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, 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 Tue, Oct 18, 2011 at 00:08, 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.  We have 32*32 = 64 multiplication on all 32-bit platforms I'm
> 99.9% sure.

I assume you mean "we have in hardware"?

Is that muldi3?

$ git ls-files "*muldi3*"
arch/arm/lib/muldi3.S
arch/blackfin/lib/muldi3.S
arch/frv/lib/__muldi3.S
arch/m68k/lib/muldi3.c
arch/microblaze/lib/muldi3.c
arch/sparc/lib/muldi3.S
$

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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