From: "David Brown" <caml@davidb.org>
To: "Stefan Monnier" <monnier@iro.umontreal.ca>, caml-list@inria.fr
Subject: Re: [Caml-list] Re: 32- and 64-bit performance
Date: Sat, 02 Apr 2005 12:50:35 -0800 [thread overview]
Message-ID: <opsomhiln2ho2unb@a64.davidb.org> (raw)
In-Reply-To: <87zmwh3p8m.fsf-monnier+gmane.comp.lang.caml.inria@gnu.org>
On Sat, 02 Apr 2005 15:23:21 -0500, Stefan Monnier
<monnier@iro.umontreal.ca> wrote:
> Under Alpha they called it "taso". Mostly used for compatibility with
> apps
> that were assuming the size of ptrs is the same as the size of int: it
> just
> made the C library use only the bottom 4GB of the address space such that
> the compiler could use only 32bit to store pointer values.
The default mode in gcc for amd64 is almost this (-mcmodel=small). It
assumes pointers live in the lower 2GB of address space, but 'sizeof (void
*)' is still 8. I'm not sure why the small model doesn't use 32-bit
pointers.
The -mcmodel=medium model does 64-bit operations on pointers, but the code
must still live in the lower 2GB of address space.
The -mcmodel=large isn't yet implemented.
Dave
next prev parent reply other threads:[~2005-04-02 20:50 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-30 2:40 Jon Harrop
2005-03-30 7:46 ` [Caml-list] " Alex Baretta
2005-03-30 8:00 ` Ville-Pertti Keinonen
2005-03-30 8:41 ` Alex Baretta
2005-03-30 9:01 ` Ville-Pertti Keinonen
2005-03-30 12:53 ` Jon Harrop
2005-03-30 14:34 ` Ville-Pertti Keinonen
2005-03-30 8:10 ` Robert Roessler
2005-03-30 8:11 ` Alexander S. Usov
2005-03-30 13:46 ` Eijiro Sumii
2005-03-31 13:42 ` Jon Harrop
2005-03-31 15:05 ` Stefan Monnier
2005-03-31 18:40 ` [Caml-list] " Jon Harrop
2005-03-31 22:41 ` Richard Jones
2005-04-02 20:23 ` Stefan Monnier
2005-04-02 20:50 ` David Brown [this message]
2005-04-03 10:01 ` [Caml-list] " Ville-Pertti Keinonen
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