From: Brian Hurt <bhurt@spnz.org>
To: David Brown <caml@davidb.org>
Cc: Alessandro Baretta <a.baretta@barettadeit.com>,
Ocaml <caml-list@inria.fr>
Subject: Re: [Caml-list] Support for 64bit Pentium?
Date: Wed, 30 Nov 2005 15:57:50 -0600 (CST) [thread overview]
Message-ID: <Pine.LNX.4.63.0511301554280.24132@localhost.localdomain> (raw)
In-Reply-To: <1133376550.15904.2.camel@shadowdb.qualcomm.com>
On Wed, 30 Nov 2005, David Brown wrote:
> On Wed, 2005-11-30 at 19:31 +0100, Alessandro Baretta wrote:
>> Shortly, most mainstream microprocessors will ship in 64 bit variants. I know
>> that ocamlopt supports AMD64, but what about EM64T, or whatever the new Intel
>> hype is called?
>
> They are identical, at least from a user-program perspective. Intel
> tries very hard to downplay this, since they've essentially reversed
> positions, and have themselves cloned AMD's features.
True story: Intel screwed up when it shipped it's first copies of the
documentation describing EMT64 technology. See, the 64-bit Pentiums only
have 36 physical address lines, while the Opterons have 40 (this makes a
difference in the total amount of real memory that they can address). The
first generation of EMT64 manuals Intel shipped out said the chips had 40
physical address bits.
Hey, Intel- you didn't quite finish filing the serial numbers off there...
Seriously, if it works on one, it'll work on the other (barring SSE3
requirements).
Brian
prev parent reply other threads:[~2005-11-30 21:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-30 18:31 Alessandro Baretta
2005-11-30 18:49 ` [Caml-list] " David Brown
2005-11-30 19:03 ` David Teller
2005-11-30 19:21 ` Zoltan Podlovics
2005-11-30 21:57 ` Brian Hurt [this message]
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