From: Joel Soete <joel.soete@tiscali.be>
To: Grant Grundler <grundler@parisc-linux.org>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] a fast fls also for 2.6?
Date: Fri, 05 Sep 2003 19:54:42 +0000 [thread overview]
Message-ID: <3F58EA02.8040404@tiscali.be> (raw)
In-Reply-To: <20030905192927.GD10216@dsl2.external.hp.com>
Grant Grundler wrote:
>On Fri, Sep 05, 2003 at 12:26:21PM -0600, Grant Grundler wrote:
>
>
>>>Without any remark, I don't know if you could also be interested to
>>>include it in 2.6.
>>>
>>>
>>no - becuase fls() and ffs() return the same values for given input.
>>(I see comments in include/asm-ppc/bitops.h to that effect).
>>
>>
>
>James Bottomley privately corrected me. fls() != ffs().
>fls() returns most significant bit set.
>
>The examples provided:
> * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
>
>have the same value for ffs() and fls(). I didn't read the rest.
>Good examples for showing bit numbering though.
>
>I'll work on adding 64-bit support to your __fls() and commit that.
>
Thanks a lot :) (it just make me happy to be usefull)
>
>sorry for the confusion,
>
Please, don't be sorry, I am frequently the first confusing thought ;)
Cheers,
Joel
next prev parent reply other threads:[~2003-09-05 19:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3F58838A.9010203@tiscali.be>
[not found] ` <3F5888F3.5060609@tiscali.be>
2003-09-05 18:26 ` [parisc-linux] a fast fls also for 2.6? Grant Grundler
2003-09-05 19:26 ` Joel Soete
2003-09-05 19:29 ` Grant Grundler
2003-09-05 19:54 ` Joel Soete [this message]
2003-08-07 15:37 Joel Soete
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