linux-kernel - Re: FP in kernelspace

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Message-Id: <200607302015.33684.ak@suse.de>
Date:	Sun, 30 Jul 2006 20:15:33 +0200
From:	Andi Kleen <ak@...e.de>
To:	Avi Kivity <avi@...o.co.il>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: FP in kernelspace


> 
> Cannot work on x86-64, even disregarding fp exceptions, because 
> kernel_fpu_begin() doesn't save the sse state which is used by fp math.
> 
> No?

It does - FXSAVE saves everything.

BTW you can use x87 on x86-64 too, you just need to use long double.

-Andi
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