From: David Brown <caml-list@davidb.org>
To: Olivier P?r?s <olivier.peres@laposte.net>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Does Caml have slow arithmetics ?
Date: Wed, 7 Jul 2004 10:06:11 -0700 [thread overview]
Message-ID: <20040707170611.GA24565@davidb.org> (raw)
In-Reply-To: <40EC122C.3040300@laposte.net>
On Wed, Jul 07, 2004 at 05:09:32PM +0200, Olivier P?r?s wrote:
> But there is no way to be sure that a pointer you got from C is
> word-aligned. Consider, for example, a smart user sending you a string
> with the first character chopped off : this pointer has an odd LSB. And
> C hackers like to do that kind of things. Xavier Leroy obviously knows
> this, so I must have missed something.
The only pointers that ocaml "cares" about (in the sense of the GC or
polymorphic compare) are those that are allocated on the ocaml heap.
These values will always be aligned. Whenever the gc or friends sees a
pointer, it checks a bitmap of pages to determine if this pointer was
ocaml allocated. If not, it ignores it completely.
Dave
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next prev parent reply other threads:[~2004-07-07 17:06 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-07 6:45 Diego Olivier Fernandez Pons
2004-07-07 8:14 ` Richard Jones
2004-07-07 9:13 ` Basile Starynkevitch [local]
2004-07-07 12:32 ` Diego Olivier Fernandez Pons
2004-07-07 13:00 ` Basile Starynkevitch [local]
2004-07-07 15:09 ` Olivier Pérès
2004-07-07 17:06 ` David Brown [this message]
2004-07-07 17:43 ` Olivier Pérès
2004-07-08 3:40 ` David Brown
2004-07-08 11:06 ` Olivier Pérès
2004-07-07 13:06 ` Richard Jones
2004-07-07 13:22 ` David Haguenauer
2004-07-07 15:48 ` Brian Hurt
2004-07-07 13:57 ` Evgeny Chukreev
2004-07-07 14:58 ` Xavier Leroy
2004-07-07 15:48 ` Evgeny Chukreev
2004-07-07 19:16 ` skaller
2004-07-08 3:44 ` David Brown
2004-07-08 5:50 ` skaller
2004-07-08 9:51 ` Andreas Rossberg
2004-07-08 12:03 ` Marcin 'Qrczak' Kowalczyk
2004-07-08 14:04 ` David Brown
2004-07-08 14:36 ` Luc Maranget
2004-07-08 15:11 ` Alex Baretta
2004-07-08 15:49 ` Luc Maranget
2004-07-09 14:06 ` Alex Baretta
2004-07-09 16:20 ` Markus Mottl
[not found] ` <Luc.Maranget@inria.fr>
2004-07-09 17:54 ` Norman Ramsey
2004-07-12 8:08 ` Luc Maranget
2004-07-08 15:51 ` Markus Mottl
2004-07-08 18:27 ` skaller
2004-07-08 21:14 ` [Caml-list] tail recursion and register poor Intel architecture Brandon J. Van Every
2004-07-08 21:35 ` Brian Hurt
2004-07-08 23:01 ` Brandon J. Van Every
2004-07-09 4:36 ` Brian Hurt
2004-07-09 6:53 ` Florian Hars
2004-07-09 14:44 ` Brandon J. Van Every
2004-07-09 6:55 ` skaller
2004-07-09 14:45 ` Brandon J. Van Every
2004-07-09 16:09 ` skaller
2004-07-10 9:19 ` [Caml-list] embedded OCaml Brandon J. Van Every
2004-07-11 23:11 ` Alex Baretta
2004-07-12 7:39 ` Brandon J. Van Every
2004-07-12 14:04 ` Alex Baretta
2004-07-12 18:48 ` Brandon J. Van Every
2004-07-12 23:22 ` Richard Jones
2004-07-13 6:39 ` Alex Baretta
2004-07-13 8:47 ` Brandon J. Van Every
2004-07-13 8:58 ` Benjamin Geer
2004-07-13 9:47 ` Brandon J. Van Every
2004-07-13 9:18 ` Damien Doligez
2004-07-13 9:56 ` [Caml-list] OCaml as business model Brandon J. Van Every
2004-07-13 9:59 ` Richard Jones
2004-07-13 10:50 ` Brandon J. Van Every
2004-07-13 11:20 ` Damien Doligez
2004-07-13 12:01 ` Brandon J. Van Every
2004-07-14 8:05 ` [Caml-list] embedded OCaml I R T
2004-07-12 10:25 ` Christophe TROESTLER
2004-07-13 7:06 ` Alex Baretta
2004-07-08 17:12 ` Tail calls (Was Re: [Caml-list] Does Caml have slow arithmetics ?) brogoff
2004-07-08 17:23 ` Richard Jones
2004-07-12 17:07 ` Xavier Leroy
2004-07-12 21:13 ` skaller
2004-07-13 7:20 ` Xavier Leroy
2004-07-08 15:00 ` [Caml-list] Does Caml have slow arithmetics ? Brian Hurt
2004-07-08 13:30 ` Alex Baretta
2004-07-07 21:26 ` Jon Harrop
2004-07-08 5:05 ` Jacques GARRIGUE
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