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From: Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
To: Gerhard Sittig <gsi-ynQEQJNshbs@public.gmane.org>
Cc: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Michael Grzeschik
	<m.grzeschik-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
	linux-spi <linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-arm-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Sascha Hauer <kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Subject: Re: [PATCH 2/3] spi: bitbang: add lsb first support
Date: Thu, 13 Mar 2014 20:22:47 +0100	[thread overview]
Message-ID: <CAMuHMdWJRz_ZDpOGO_uBBshajWHDjirvZStYuWxZpkFOsexLRQ@mail.gmail.com> (raw)
In-Reply-To: <20140313181107.GT3327-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>

Hi Gerhard,

On Thu, Mar 13, 2014 at 7:11 PM, Gerhard Sittig <gsi-ynQEQJNshbs@public.gmane.org> wrote:
> http://graphics.stanford.edu/~seander/bithacks.html#BitReverseObvious
> and the following sections suggest that code might get less
> expensive when you accept to no longer see at first glance what's
> happening.  Given a good identifier and an appropriate comment,
> http://graphics.stanford.edu/~seander/bithacks.html#ReverseParallel
> might be acceptable for mainline.

I had faint memories of seeing this algorithm in the Linux kernel sources,
but I can't seem to find it anymore.

We do have a different implementation in lib/bitrev.c.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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  parent reply	other threads:[~2014-03-13 19:22 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-12 15:20 [PATCH 0/3] spi: bitbang fixes and passive serial driver Michael Grzeschik
     [not found] ` <1394637636-29042-1-git-send-email-m.grzeschik-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-03-12 15:20   ` [PATCH 1/3] spi: bitbang: fix shift for getmosi Michael Grzeschik
     [not found]     ` <1394637636-29042-2-git-send-email-m.grzeschik-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-03-12 21:23       ` Gerhard Sittig
2014-03-12 21:37         ` Mark Brown
2014-03-12 15:20   ` [PATCH 2/3] spi: bitbang: add lsb first support Michael Grzeschik
     [not found]     ` <1394637636-29042-3-git-send-email-m.grzeschik-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-03-12 21:29       ` Gerhard Sittig
     [not found]         ` <20140312212941.GP3327-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>
2014-03-12 21:35           ` Mark Brown
     [not found]             ` <20140312213544.GX28112-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-03-13 18:11               ` Gerhard Sittig
     [not found]                 ` <20140313181107.GT3327-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>
2014-03-13 18:41                   ` Mark Brown
2014-03-13 19:22                   ` Geert Uytterhoeven [this message]
2014-03-12 15:20   ` [PATCH 3/3] spi: psdev: add passive serial driver Michael Grzeschik
2014-03-12 15:42   ` [PATCH 0/3] spi: bitbang fixes and " Michael Grzeschik
2014-03-12 15:53 Michael Grzeschik
     [not found] ` <1394639617-26917-1-git-send-email-m.grzeschik-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2014-03-12 15:53   ` [PATCH 2/3] spi: bitbang: add lsb first support Michael Grzeschik
2014-03-12 15:53     ` Michael Grzeschik

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