linux-kernel - Re: Possibility of adding -march=native to x86

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Date:	Thu, 25 Oct 2007 13:20:51 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Adrian Bunk <bunk@...nel.org>
Cc:	Michael Lothian <mike@...eburn.co.uk>, linux-kernel@...r.kernel.org
Subject: Re: Possibility of adding -march=native to x86

On Thu, 25 Oct 2007 22:20:31 +0200
Adrian Bunk <bunk@...nel.org> wrote:

> On Thu, Oct 25, 2007 at 09:12:45PM +0100, Michael Lothian wrote:
> > > The MPENTIUM4 option does not only set -march=pentium4, it also
> > > enables several other options in arch/i386/Kconfig.cpu resulting
> > > in better performance.
> > 
> > How about an autodetect to set the right options here too using
> > cpuid?
> > 
> > With a warning of course that the code produced will be specifically
> > for the native cpu that it's compiled on.
> 
> If you don't know or can figure out yourself the CPU you have, you'd 
> better not compile your own kernel...
> 
... or if there is more than just one CPU type, you pick generic.


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