Re: [PATCH] Re-implemented i586 asm AES (updated)

[Andi Kleen <ak@muc.de>]

On Sat, Aug 07, 2004 at 09:49:45AM +0200, Kasper Sandberg wrote:
> i dont know anything at all about this, but wouldnt it be possible to
> optimize it even more, if there were a version for each cpu, like one
> for athlon-xp and one for p4?

I also haven't looked at the code (It seems except for Linus/James
everybody posting to this thread is clueless about the actual code -
is that a good sign or a bad one? ;-).

But if someone wanted to write such optimized versions .altinstructions
would make it easy to switch to the right version at runtime.  There 
is no bit for Athlon-XP right now, but for AMD K8 B/C and for P3/P4. 
A bit for XP could be relatively easily added. You can also test
for SSE2, MMX etc. which may be more generic.

-Andi