From: David Miller <davem@davemloft.net>
To: dhowells@redhat.com
Cc: arnd@arndb.de, linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, dmitry.kasatkin@intel.com
Subject: Re: [PATCH] MPILIB: Provide count_leading/trailing_zeros() based on arch functions
Date: Fri, 20 Jul 2012 17:46:41 -0700 (PDT) [thread overview]
Message-ID: <20120720.174641.159144353919647856.davem@davemloft.net> (raw)
In-Reply-To: <5723.1342794099@warthog.procyon.org.uk>
From: David Howells <dhowells@redhat.com>
Date: Fri, 20 Jul 2012 15:21:39 +0100
> Arnd Bergmann <arnd@arndb.de> wrote:
>
>> I don't generally like to put stuff into asm-generic when it's unlikely
>> to be overridden by architectures. It would really belong into
>> include/linux, but then again we have all the other bitops in asm-generic
>> as well, so whatever...
>
> Some arches (such as Sparc, I think) have count-leading-zero instructions.
Yes, newer sparc64 chips have leading-zero-detect, and I was pretty
sure that powerpc had something similar. It's called count-leading-
zeros or something like that.
next prev parent reply other threads:[~2012-07-21 0:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-20 12:56 David Howells
2012-07-20 13:53 ` Arnd Bergmann
2012-07-20 14:21 ` David Howells
2012-07-20 22:02 ` Arnd Bergmann
2012-07-21 0:46 ` David Miller [this message]
2012-08-10 12:51 ` Jan Engelhardt
2012-08-10 21:08 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2012-07-06 15:45 David Howells
2012-07-13 4:04 ` James Morris
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