From: Lee Revell <rlrevell@joe-job.com>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: 7eggert@gmx.de, ivan@yosifov.net, linux-kernel@vger.kernel.org
Subject: Re: Noob question. Why is the for-pentium4 kernel built with -march=i686 ?
Date: Tue, 19 Jul 2005 16:19:22 -0400 [thread overview]
Message-ID: <1121804362.4299.9.camel@mindpipe> (raw)
In-Reply-To: <Pine.LNX.4.61.0507192214100.16157@yvahk01.tjqt.qr>
On Tue, 2005-07-19 at 22:15 +0200, Jan Engelhardt wrote:
> >AFAIK it's not possible to use SSE and MME in kernel mode, since these
> >registers aren't preserved (it would be expensive).
>
> Floating point is anyway a no-no in the kernel.
However, there are a few exceptions like mmx_memcpy.
Lee
next prev parent reply other threads:[~2005-07-19 20:19 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4s3M3-ph-15@gated-at.bofh.it>
[not found] ` <4s4y2-Rt-17@gated-at.bofh.it>
[not found] ` <4s5aD-1sw-3@gated-at.bofh.it>
2005-07-19 20:12 ` Noob question. Why is the for-pentium4 kernel built with -march=i686 ? Bodo Eggert
2005-07-19 20:15 ` Jan Engelhardt
2005-07-19 20:19 ` Lee Revell [this message]
2005-07-19 17:07 Ivan Yosifov
2005-07-19 17:52 ` Jan Engelhardt
2005-07-19 18:35 ` Ivan Yosifov
2005-07-20 8:03 ` Kerin Millar
2005-07-20 7:57 ` Jan Engelhardt
2005-07-20 8:23 ` Ivan Yosifov
2005-07-20 9:21 ` Jan Engelhardt
2005-07-20 9:44 ` Kerin Millar
2005-07-20 9:25 ` Ivan Yosifov
2005-07-20 10:38 ` Denis Vlasenko
2005-07-20 11:33 ` Ivan Yosifov
2005-07-20 11:42 ` Simon Strandman
2005-07-20 14:29 ` Dave Neuer
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