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

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Message-ID: <20071025202031.GU30533@stusta.de>
Date:	Thu, 25 Oct 2007 22:20:31 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Michael Lothian <mike@...eburn.co.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Possibility of adding -march=native to x86

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...

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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