Version française
Home     About     Download     Resources     Contact us    

This site is updated infrequently. For up-to-date information, please visit the new OCaml website at

Browse thread
Support for 64bit Pentium?
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: 2005-11-30 (21:52)
From: Brian Hurt <bhurt@s...>
Subject: Re: [Caml-list] Support for 64bit Pentium?

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