Re: [git pull] x86 fixes

From: Adrian Bunk
Date: Tue Sep 09 2008 - 12:07:27 EST

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



"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

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at