Re: [PATCH] MPILIB: Provide count_leading/trailing_zeros() basedon arch functions

From: David Miller
Date: Fri Jul 20 2012 - 20:47:05 EST

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

> Arnd Bergmann <arnd@xxxxxxxx> 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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