From: Grant Grundler <grundler@parisc-linux.org>
To: Joel Soete <joel.soete@tiscali.be>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] a fast fls also for 2.6?
Date: Fri, 5 Sep 2003 13:29:27 -0600 [thread overview]
Message-ID: <20030905192927.GD10216@dsl2.external.hp.com> (raw)
In-Reply-To: <20030905182621.GC10216@dsl2.external.hp.com>
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.
sorry for the confusion,
grant
next prev parent reply other threads:[~2003-09-05 19:29 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 [this message]
2003-09-05 19:54 ` Joel Soete
2003-08-07 15:37 Joel Soete
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