From: David Howells <dhowells@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: dhowells@redhat.com, David Miller <davem@davemloft.net>,
James.Bottomley@hansenpartnership.com, geert@linux-m68k.org,
linux-arch@vger.kernel.org
Subject: Re: Arch maintainers Ahoy!
Date: Thu, 24 May 2012 18:16:46 +0100 [thread overview]
Message-ID: <14829.1337879806@redhat.com> (raw)
In-Reply-To: <CA+55aFwziHq8XZsD_N6sNHNfOoCjhE7AyuakXU0yeWVnk0v1LQ@mail.gmail.com>
Linus Torvalds <torvalds@linux-foundation.org> wrote:
> > I didn't suggest it was free, but it might be cheaper. Besides x86/x86_64
> > has BSF/BSR instructions - though having played with Dave's algorithm
> > some, I don't think they're usable for this.
>
> David, I don't think you've followed this saga very well.
No, I didn't phrase the paragraph above very well, so let me rephrase: I think
Dave's patch is _good_[*] and that BSF/BSR would _not_ be usable for it.
I was thinking that reordering the bytes on LE might help, but no, it doesn't
as Dave's algorithm works equally well, no matter on the order the bytes are
in.
David
[*] Barring an extraneous semicolon already pointed out
next prev parent reply other threads:[~2012-05-24 17:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-21 16:50 Arch maintainers Ahoy! (was Re: x86: faster strncpy_from_user()) Linus Torvalds
2012-05-23 5:46 ` Arch maintainers Ahoy! David Miller
2012-05-23 8:02 ` Geert Uytterhoeven
2012-05-23 9:40 ` James Bottomley
2012-05-23 15:15 ` Linus Torvalds
2012-05-23 17:21 ` David Miller
2012-05-23 17:32 ` Linus Torvalds
2012-05-23 18:16 ` David Miller
2012-05-23 18:27 ` Linus Torvalds
2012-05-23 18:35 ` David Miller
2012-05-23 18:44 ` Linus Torvalds
2012-05-23 18:46 ` Linus Torvalds
2012-05-23 20:36 ` David Miller
2012-05-23 21:01 ` Linus Torvalds
2012-05-24 2:11 ` David Miller
2012-05-24 5:25 ` Paul Mackerras
2012-05-24 5:56 ` David Miller
2012-05-24 9:40 ` David Howells
2012-05-24 15:53 ` Linus Torvalds
2012-06-13 11:08 ` Michael Cree
2012-06-13 14:51 ` Linus Torvalds
2012-05-24 16:45 ` David Howells
2012-05-24 16:56 ` Linus Torvalds
2012-05-24 17:16 ` David Howells [this message]
2012-05-23 17:19 ` David Miller
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