netdev - Re: [RFC] div64

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Message-ID: <45EDB799.5080509@zytor.com>
Date:	Tue, 06 Mar 2007 10:48:57 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	David Miller <davem@...emloft.net>,
	shemminger@...ux-foundation.org, jengelh@...ux01.gwdg.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC] div64_64 support II

Andi Kleen wrote:
>> The problem with these algorithms that tradoff one or more
>> multiplies in order to avoid a divide is that they don't
>> give anything and often lose when both multiplies and
>> divides are emulated in software.
> 
> Actually on rereading this: is there really any Linux port
> that emulates multiplies in software? I thought that was only
> done on really small microcontrollers or smart cards; but anything
> 32bit+ that runs Linux should have hardware multiply, shouldn't it?

SPARC < v8 does multiplies using an MSTEP instruction.

	-hpa
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