From: Timothy Miller <miller@techsource.com>
To: "Nakajima, Jun" <jun.nakajima@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org
Subject: Re: Intel vs AMD x86-64
Date: Thu, 26 Feb 2004 11:04:36 -0500 [thread overview]
Message-ID: <403E1914.5060209@techsource.com> (raw)
In-Reply-To: <7F740D512C7C1046AB53446D37200173EA288C@scsmsx402.sc.intel.com>
Nakajima, Jun wrote:
> Yes, that's the very reason I said "useless for compilers." The way
> IP/RIP is updated is different (and implementation specific) on those
> processors if 66H is used with a near branch. For example, RIP may be
> zero-extended to 64 bits (from IP), as you observed before.
>
This is obviously an extremely minor nit-pick, because we're talking
about one instruction here with an interpretation that is far from
obvious, but given that there are now only two architectures which
support x86-64, did Intel choose to do it differently from AMD because
it was poorly defined, or because it wasn't important enough to want to
impact the efficiency of the design?
There are people who would go way out of their way to get a 5%
improvement in performance or decrease in size. If using 66H with near
branches could in some way do that, they would really really want to use
it. This is why I'm curious.
next prev parent reply other threads:[~2004-02-26 15:54 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-26 1:19 Intel vs AMD x86-64 Nakajima, Jun
2004-02-26 16:04 ` Timothy Miller [this message]
2004-02-27 3:16 ` Bill Davidsen
-- strict thread matches above, loose matches on Subject: below --
2004-03-02 23:22 Nakajima, Jun
2004-02-25 20:07 Nakajima, Jun
2004-02-25 23:44 ` Timothy Miller
2004-02-26 0:13 ` H. Peter Anvin
[not found] <1sRYA-1uZ-23@gated-at.bofh.it>
[not found] ` <1sSi2-1NC-5@gated-at.bofh.it>
[not found] ` <1sT4l-2CW-17@gated-at.bofh.it>
2004-02-25 15:41 ` Bill Davidsen
2004-02-25 16:08 ` Moritz Muehlenhoff
2004-02-25 3:24 Nakajima, Jun
2004-02-25 16:22 ` Timothy Miller
2004-02-25 16:17 ` H. Peter Anvin
2004-02-25 17:18 ` Timothy Miller
2004-02-25 17:16 ` H. Peter Anvin
2004-02-25 19:05 ` Timothy Miller
2004-02-25 3:07 Nakajima, Jun
[not found] <7F740D512C7C1046AB53446D37200173EA2684@scsmsx402.sc.intel.com.suse.lists.linux.kernel>
2004-02-24 23:49 ` Andi Kleen
2004-02-24 23:15 Nakajima, Jun
2004-02-25 1:52 ` Chris Wedgwood
2004-02-24 21:01 Sean Fao
2004-02-24 21:26 ` Linus Torvalds
2004-02-24 22:21 ` Timothy Miller
2004-02-25 22:30 ` Davide Rossetti
2004-02-24 21:31 ` Timothy Miller
2004-02-24 21:31 ` Linus Torvalds
2004-02-24 21:28 ` Dave Jones
2004-02-26 21:39 ` Kai Henningsen
2004-02-24 2:42 Albert Cahalan
2004-02-24 16:44 ` Dave Jones
2004-02-24 15:11 ` Albert Cahalan
2004-02-24 17:34 ` Dave Jones
2004-02-24 15:29 ` Albert Cahalan
2004-02-24 18:07 ` Dave Jones
2004-02-23 19:59 Xose Vazquez Perez
2004-02-23 18:10 Nakajima, Jun
2004-02-24 13:25 ` Pavel Machek
2004-02-18 21:28 Peter Maas
2004-02-18 21:26 Peter Maas
2004-02-18 1:44 Linus Torvalds
2004-02-18 9:56 ` Mikael Pettersson
2004-02-18 14:31 ` Diego Calleja García
2004-02-18 18:17 ` Bryan O'Sullivan
2004-02-18 14:54 ` Stefan Smietanowski
2004-02-18 15:47 ` Linus Torvalds
2004-02-22 2:59 ` Herbert Poetzl
2004-02-22 3:12 ` Linus Torvalds
2004-02-22 3:39 ` Tomasz Rola
2004-02-22 3:47 ` Mike Fedyk
2004-02-22 4:12 ` Scott Robert Ladd
2004-02-23 0:38 ` Timothy Miller
2004-02-23 2:17 ` Tom Vier
2004-02-22 8:38 ` Geert Uytterhoeven
2004-02-22 10:00 ` Vojtech Pavlik
2004-02-23 15:51 ` Clay Haapala
2004-02-23 17:03 ` Adrian Bunk
2004-02-23 17:31 ` Linus Torvalds
2004-02-24 9:47 ` Kees Bakker
2004-02-24 9:59 ` viro
2004-02-24 10:59 ` Andrew Walrond
2004-02-23 18:56 ` Christoph Hellwig
2004-02-23 21:25 ` Rik van Riel
2004-02-23 21:36 ` Linus Torvalds
2004-02-23 21:48 ` David S. Miller
2004-02-23 22:08 ` Linus Torvalds
2004-02-23 22:06 ` David S. Miller
2004-02-23 22:56 ` H. Peter Anvin
2004-02-24 1:01 ` Thomas Zehetbauer
2004-02-24 1:11 ` John Heil
2004-02-24 13:32 ` Timothy Miller
2004-02-24 14:39 ` Scott Robert Ladd
2004-02-24 19:43 ` Rogier Wolff
2004-02-24 19:49 ` John Heil
2004-02-24 20:03 ` Mike Fedyk
2004-02-24 20:03 ` John Heil
2004-02-24 21:20 ` Timothy Miller
2004-02-25 18:40 ` Matt Seitz
2004-02-18 19:13 ` Aaron Lehmann
2004-02-19 6:02 ` Mikael Pettersson
2004-02-19 9:15 ` Terje Eggestad
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