Re: ia32e, er EM64T that is...

[Alan Cox <alan redhat com>]

On Mon, Sep 06, 2004 at 10:44:47PM -0700, Bryan O'Sullivan wrote:
> On Mon, 2004-09-06 at 13:47 -0400, Alan Cox wrote:
> 
> > em64t as Intel currently call it is pretty close to the x86-64 architecture
> > so its not too bad a clone. It lacks prefetch/prefetchw which can also be 
> > used by some fancy user space stuff like image processors. 
> 
> Er, EM64T provides the SSE prefetch{nta,t[012]} instructions, which are
> somewhat more expressive than prefetch anyway, and which also run on AMD
> chips.  Shame about the lack of a prefetchw analogue, but it's hardly a
> surprise that Intel isn't implementing 3dnow.

x86-64 requires prefetch/prefetchw. It's in the specification.

Alan