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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: "Vaittinen, Matti" <Matti.Vaittinen@fi.rohmeurope.com>
Cc: Matti Vaittinen <mazziesaccount@gmail.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>, Jiri Kosina <trivial@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Yury Norov <yury.norov@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Geert Uytterhoeven <geert+renesas@glider.be>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/4] bitops: Add single_bit_set()
Date: Mon, 22 Nov 2021 15:00:00 +0200 [thread overview]
Message-ID: <YZuUUGvVjcHk79k0@smile.fi.intel.com> (raw)
In-Reply-To: <YZuTt3+PPvyJsFQ/@smile.fi.intel.com>
On Mon, Nov 22, 2021 at 02:57:27PM +0200, Andy Shevchenko wrote:
> On Mon, Nov 22, 2021 at 12:42:21PM +0000, Vaittinen, Matti wrote:
> > On 11/22/21 13:28, Andy Shevchenko wrote:
...
> > I think I actually tried using hweight() at some point but don't really
> > remember why I rolled the single_bit_set. (I remember the hweight()
> > usage because I had to do some googling as I had never heard term
> > hamming weight before).
>
> Oh, it should be a very good reason not to use hweight() since on some
> architectures it might become just one assembly instruction.
(for the sake of educational purposes to us both)
https://vaibhavsagar.com/blog/2019/09/08/popcount/
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-11-22 13:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-22 11:03 [PATCH 0/4] Provide event map helper for regulator drivers Matti Vaittinen
2021-11-22 11:03 ` [PATCH 1/4] bitops: Add single_bit_set() Matti Vaittinen
2021-11-22 11:28 ` Andy Shevchenko
2021-11-22 12:42 ` Vaittinen, Matti
2021-11-22 12:57 ` Andy Shevchenko
2021-11-22 13:00 ` Andy Shevchenko [this message]
2021-11-22 13:18 ` Vaittinen, Matti
2021-11-23 10:42 ` David Laight
2021-11-23 10:47 ` Andy Shevchenko
2021-11-23 10:58 ` David Laight
2021-11-23 13:43 ` 'Andy Shevchenko'
2021-11-23 14:36 ` David Laight
2021-11-23 11:42 ` Vaittinen, Matti
2021-11-22 17:54 ` Yury Norov
2021-11-22 19:56 ` Andy Shevchenko
2021-11-23 7:51 ` Yury Norov
2021-11-23 5:26 ` Vaittinen, Matti
2021-11-23 7:33 ` Yury Norov
2021-11-23 9:03 ` Andy Shevchenko
2021-11-23 9:10 ` Geert Uytterhoeven
2021-11-22 11:03 ` [PATCH 2/4] regulators: Add regulator_err2notif() helper Matti Vaittinen
2021-11-22 11:04 ` [PATCH 3/4] regulators: irq_helper: Provide helper for trivial IRQ notifications Matti Vaittinen
2021-11-22 11:48 ` Andy Shevchenko
2021-11-22 12:44 ` Vaittinen, Matti
2021-11-22 11:04 ` [PATCH 4/4] regulator: Drop unnecessary struct member Matti Vaittinen
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