linux-kernel - Re: [PATCH] MPILIB: Provide count_leading/trailing

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Message-Id: <20120720.174641.159144353919647856.davem@davemloft.net>
Date:	Fri, 20 Jul 2012 17:46:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dhowells@...hat.com
Cc:	arnd@...db.de, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmitry.kasatkin@...el.com
Subject: Re: [PATCH] MPILIB: Provide count_leading/trailing_zeros() based
 on arch functions

From: David Howells <dhowells@...hat.com>
Date: Fri, 20 Jul 2012 15:21:39 +0100

> Arnd Bergmann <arnd@...db.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.

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