From: Bodo Eggert <harvested.in.lkml@posting.7eggert.dyndns.org>
To: ivan@yosifov.net, Jan Engelhardt <jengelh@linux01.gwdg.de>,
linux-kernel@vger.kernel.org
Subject: Re: Noob question. Why is the for-pentium4 kernel built with -march=i686 ?
Date: Tue, 19 Jul 2005 22:12:24 +0200 [thread overview]
Message-ID: <E1DuyS0-00013Z-VG@be1.lrz> (raw)
In-Reply-To: 4s5aD-1sw-3@gated-at.bofh.it
Ivan Yosifov <ivan@yosifov.net> wrote:
> -march implies -mtune and also implies thing like -msse2 for the
> instruction set where applicable.
> I think -march=pentium4 is equivalent to -mmmx -msse -msse2
> -mtune=pentium4 ( if I have not fogotten anything ).
> Pentium4 supports things like sse2 and mmx which AFAIK plain i686 does
> not.
AFAIK it's not possible to use SSE and MME in kernel mode, since these
registers aren't preserved (it would be expensive).
--
Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
verbreiteten Lügen zu sabotieren.
next parent reply other threads:[~2005-07-19 20:12 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 ` Bodo Eggert [this message]
2005-07-19 20:15 ` Noob question. Why is the for-pentium4 kernel built with -march=i686 ? Jan Engelhardt
2005-07-19 20:19 ` Lee Revell
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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