linux-kernel - Re: FP in kernelspace

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Message-ID: <Pine.LNX.4.61.0607302016340.25626@yvahk01.tjqt.qr>
Date:	Sun, 30 Jul 2006 20:17:39 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Avi Kivity <avi@...o.co.il>
cc:	Andi Kleen <ak@...e.de>, 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?

No. You can - if you want - exclusively use x87 math on x64 (at least for 
userspace) and don't care about SSE. Otherwise, GCC having a -mfpmath=387 
would be pretty useless.

No?


Jan Engelhardt
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