From: Kerin Millar <kerframil@gmail.com>
To: ivan@yosifov.net
Cc: linux-kernel@vger.kernel.org
Subject: Re: Noob question. Why is the for-pentium4 kernel built with -march=i686 ?
Date: Wed, 20 Jul 2005 10:44:02 +0100 [thread overview]
Message-ID: <1121852642.18129.39.camel@localhost> (raw)
In-Reply-To: <1121847799.31603.5.camel@home.yosifov.net>
On Wed, 2005-07-20 at 11:23 +0300, Ivan Yosifov wrote:
> On Wed, 2005-07-20 at 09:03 +0100, Kerin Millar wrote:
> > On Tue, 19 Jul 2005 21:35:51 +0300, Ivan Yosifov wrote:
> >
<snip>
> > Also, I believe that the -march=pentium4 option /was/ actually used up
> > until kernel 2.6.10 where it was dropped because of a risk that some
> > versions of gcc would cause the kernel to use SSE registers for data
> > movement (which is a no-no).
> >
>
> You seem right. I fetched a 2.6.9 tarball and it is really built with
> -march=pentium4. Do you know which are versions of gcc in question ?
>
No, I'm afraid not. I only know that the advice came from Richard
Henderson who (I think) is one of the core glibc hackers. You can see
the point at which it was introduced by Linus in the ChangeLog (2nd
message from last):
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.10
Cheers,
--Kerin Millar
next prev parent reply other threads:[~2005-07-20 8:43 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-19 17:07 Noob question. Why is the for-pentium4 kernel built with -march=i686 ? 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 [this message]
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
[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
2005-07-19 20:15 ` Jan Engelhardt
2005-07-19 20:19 ` Lee Revell
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