From: Florian Hars <hars@bik-gmbh.de>
To: "Bauer, Christoph" <Christoph.Bauer@lms-gmbh.de>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] The tag bit
Date: Thu, 12 Aug 2004 16:55:14 +0200 [thread overview]
Message-ID: <411B84D2.7050705@bik-gmbh.de> (raw)
In-Reply-To: <D981925B4F2CD611870300E0184CEE9B0157F25F@mail.lms-gmbh.de>
Bauer, Christoph wrote:
> Isn't it possible to divide the memory in blocks of 33 (65 on 64 bit
> machines) Words and the first Word contains all the tag bits?
Good idea, but lets go the whole way: I always thougth the decision to have
eight bits to a byte instead of nine most unfortunate. Why don't we just add a
bit to all our bytes, we could express so much more per byte? Just imagine the
possibilities in I18N: UTF-18 would need considerably less plane shifting that
UTF-16.
(On a more serious note: You propose to turn the tag bit into a tag long word,
requiring two memory acesses instead of one and blowing up the storage
requriments for ints and pointers by a factor of two, which will slow down
about everything. You can get more or less the same effects now without any
change to the compiler by using Int32.)
Yours, Florian.
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next prev parent reply other threads:[~2004-08-12 14:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-12 14:31 Bauer, Christoph
2004-08-12 14:55 ` Florian Hars [this message]
2004-08-12 14:56 ` Marcin 'Qrczak' Kowalczyk
2004-08-12 15:10 ` Olivier Pérès
2004-08-12 15:30 ` Brian Hurt
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