netdev - Re: [RFC] div64

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Message-Id: <20070306.102551.34761735.davem@davemloft.net>
Date:	Tue, 06 Mar 2007 10:25:51 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ilmari@...ari.org
Cc:	andi@...stfloor.org, shemminger@...ux-foundation.org,
	jengelh@...ux01.gwdg.de, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [RFC] div64_64 support II

From: ilmari@...ari.org (Dagfinn Ilmari Mannsåker)
Date: Tue, 06 Mar 2007 18:43:14 +0100

> Andi Kleen <andi@...stfloor.org> writes:
> 
> > 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?
> 
> SPARCv7 (sun4/sun4c) doesn't have hardware mul/div. This includes
> SparcStation 1, 1+, 2, SLC, ELC, IPC and IPX.

Right and the cypress sun4m parts don't do multiply/divide in
hardware either.

I believe the Alpha does divide in software too, see
arch/alpha/lib/divide.S
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