From: Jamie Lokier <jamie@shareable.org>
To: Avi Kivity <avi@redhat.com>
Cc: David Howells <dhowells@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Matthew Wilcox <matthew@wil.cx>,
Ralf Baechle <ralf@linux-mips.org>,
mingo@elte.hu, tglx@linutronix.de, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] X86: Optimise fls(), ffs() and fls64()
Date: Thu, 15 Apr 2010 12:41:47 +0100 [thread overview]
Message-ID: <20100415114146.GA10863@shareable.org> (raw)
In-Reply-To: <4BC6D334.8050607@redhat.com>
Avi Kivity wrote:
> Likely. But we haven't tested all current and future x86 clones, and
> they may be based off the Intel documentation instead of the AMD
> documentation.
I wonder about that too. I got the impression Transmeta did lots of
testing real x86s in all sorts of corner cases, because the manuals
don't cover everything that the broad base of software depends on in
practice. Clone makers have to do it to a much higher standard than
emulators because you can't generally release patches...
I think Via (including whatever the CPU line was formerly called)
have been bitten a few times by not quite matching software
expectations.
Even Intel was caught on x86_64 at the beginning by slight differences
when they cloned AMD's design :-)
-- Jamie
next prev parent reply other threads:[~2010-04-15 11:42 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4BACCB4E.7010108@draigBrady.com>
2010-03-26 14:42 ` [PATCH 1/3] X86: Optimise fls(), ffs() and fls64() David Howells
2010-03-26 14:42 ` [PATCH 2/3] Adjust the comment on get_order() to describe the size==0 case David Howells
2010-03-26 14:42 ` [PATCH 3/3] Optimise get_order() David Howells
2010-03-26 14:42 ` David Howells
2010-03-26 17:23 ` [PATCH 1/3] X86: Optimise fls(), ffs() and fls64() Linus Torvalds
2010-03-26 17:37 ` Scott Lurndal
2010-03-26 17:42 ` Linus Torvalds
2010-04-06 13:57 ` Jamie Lokier
2010-04-06 14:40 ` Linus Torvalds
2010-03-26 17:42 ` David Howells
2010-03-26 17:45 ` Linus Torvalds
2010-03-26 17:58 ` Ralf Baechle
2010-03-26 18:03 ` Linus Torvalds
2010-03-26 18:16 ` Matthew Wilcox
2010-04-06 13:30 ` Matthew Wilcox
2010-04-14 11:49 ` David Howells
2010-04-14 14:30 ` Avi Kivity
2010-04-15 8:48 ` David Howells
2010-04-15 8:49 ` Avi Kivity
2010-04-15 11:41 ` Jamie Lokier [this message]
2010-03-26 17:52 ` Matthew Wilcox
2010-04-14 13:13 ` David Howells
2010-01-13 19:39 David Howells
2010-01-13 20:15 ` Geert Uytterhoeven
2010-01-13 21:59 ` David Howells
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