From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: Anthony Liguori <aliguori@us.ibm.com>
Subject: Re: [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X
Date: Tue, 27 Jan 2009 00:34:03 +0000 [thread overview]
Message-ID: <200901270034.04844.paul@codesourcery.com> (raw)
In-Reply-To: <497DD950.2080908@us.ibm.com>
> Out of curiousity, what are the benefits of using 64-bit apps in OS X?
My guess is that same as most other x86 targets: The i386 legacy mode is
crippled by lack of registers, modern x86 hardware has a big fat wide memory
bus, and noone's bothered implementing an ILP32 64-bit API[1], so 64-bit apps
give measurably better overall performance.
Paul
[1] ILP32 APIs for 64-bit x86 do exist, but the architecture is missing a
couple of features so they're a bit hairy, and AFAIK not supported by any
mainstream operating systems.
next prev parent reply other threads:[~2009-01-27 0:34 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-24 19:44 [Qemu-devel] [PATCH] Enabled building of x86_64 code on Mac OS X Alexander Graf
2009-01-26 15:40 ` Anthony Liguori
2009-01-27 0:34 ` Paul Brook [this message]
2009-01-27 0:42 ` Jamie Lokier
2009-01-27 0:59 ` Paul Brook
2009-01-27 1:22 ` Anthony Liguori
2009-01-27 9:21 ` Alexander Graf
2009-01-27 14:37 ` Jamie Lokier
2009-01-27 15:00 ` Laurent Desnogues
[not found] ` <BCD74E09-BC4C-4FC6-B814-D0276B763A9C@hotmail.com>
2009-01-27 0:40 ` C.W. Betts
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