Re: [git pull] x86 fixes

Adrian Bunk
2008-09-09T16:07:26Z

On Mon, Sep 08, 2008 at 12:30:02PM -0700, Linus Torvalds wrote:
>...
> - "modern 32-bit": PPro and better. Can take CMOV, MMX and TSC for
> granted.
>
> Yes, there are graduations to the above, but reasonably, those three are I
> think the "architectural" big versions. The rest should be:
>
> - pure "tuning" options. A Pentium 4 is different from Core 2 in tuning,
> and the best code sequences can be very very different, but the binary
> should work on both.
>
> - with *dynamic* choices for the differences that are architecturally
> visible.
>
> Ie the whole choice of syscall/sysenter/int80 is dynamic, not specified
> statically at compile time with a config option. So are things like the
> different XMM versions etc.
>...

We use 3DNow! for bigger memcpy's if the kernel is configured for a K7.

How does this fit into your picture?

> Linus

cu
Adrian

--

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"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed