Re: Intel vs AMD64

[Chris Wedgwood]

On Wed, Feb 25, 2004 at 09:32:08PM -0800, Nakajima, Jun wrote:

> Yes, "implementation specific" is one of the differences between
> IA-32e and AMD64, i.e. that behavior is architecturally defined on
> AMD64, but on IA-32e (as I posted):

>   Near branch with 66H prefix:
>     As documented in PRM the behavior is implementation specific and
>     should avoid using 66H prefix on near branches.


Not that it really matters that much --- but I'm curious to know why
Intel made this decision?

It seems really dumb to make such differences when Intel is already
sorely lagging behind their competitor here, I would think given the
circumstances Intel would try to be as compatible as possible on all
fronts.

I'd almost be nervous about getting an IA-32e CPU right now given that
the AMD64 chips work just fine, have had lots of testing and there is
plenty of code out there which is *known* to work reliably.



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