Re: Possibility of adding -march=native to x86

Arjan van de Ven
2007-10-25T20:24:38Z

On Thu, 25 Oct 2007 22:20:31 +0200
Adrian Bunk <bunk@kernel.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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