[mortehu]

> I'd kill for a 128-bit architecture so a UUID compare would be a single instruction

Well, there's PCMPESTRI on Intel.

http://www.felixcloutier.com/x86/PCMPESTRI.html

[jsmthrowaway]

Yeah, I just said this in another comment, but SSE is my weak point; I stopped writing assembly and dealing with this stuff before SSE was even introduced.

That looks basically like what you need, though, yeah. Cool.