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To: Tenchusatsu who wrote (109154)9/1/2000 10:17:14 AM
From: Rob Young  Read Replies (2) of 186894
 
Tench,

What you have to understand in all this is that Digital
spent a good deal of time investigating VLIW and rejected
it out of hand. He isn't tuning a fiddle and only time
will prove that. And yes IA64 is a "dumb machine"
because it is an in-order machine. He is being colorful
when he says that. That is not much of a stretch either.
It is a dumb machine. The compiler says "here play
this record" and the machine says "otay!" Whereas in
OOO it gets quite creative to prevent stalls. Sure you
guys have predication and speculation and Alpha has CMOV.

There's nothing new under the Sun.

And I think it is fair to say they have good evidence
to "prove" the "dumb machine" statement. Read the
section titled "IA64: a smart compiler and a dumb
machine" beginning on page 2:

alphapowered.com

Also, from that paper:

"In the early 1990s, we designed a VLIW version of Alpha
similar to IA64 [1,2,3,4,5,6]. During this process we
discovered that most of the compiler technology for a
VLIW processor COULD EQUALLY BE APPLIED TO A RISC
PROCESSOR, and by avoiding IA64-style extensions to Alpha,
we could also implement an out-of-order processor."

(My CAPS).

Now maybe you would have us all believe there is some
sort of "secret knowledge" only the mighty Intel/HP can
come up with... Prove it! You can't, and Paul DeMone is
also one of the few to show that the "Emperor has no
clothes"

But oh... just wait until it comes out blah blah blah.

Which quarter? Which year?

Rob
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