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From: Balbir Singh <bsingharora@gmail.com>
To: "linux@horizon.com" <linux@horizon.com>
Cc: linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org,
	mita@miraclelinux.com
Subject: Re: [PATCH 8/12] generic hweight{32,16,8}()
Date: Thu, 2 Feb 2006 15:04:18 +0530	[thread overview]
Message-ID: <661de9470602020134i7f487717p6ed7641ec4d491bb@mail.gmail.com> (raw)
In-Reply-To: <20060131164949.3365.qmail@science.horizon.com>

> This is an extremely well-known technique.  You can see a similar version
> that uses a multiply for the last few steps at
> http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
> whch refers to
> "Software Optimization Guide for AMD Athlon 64 and Opteron Processors"
> http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/25112.PDF
>
> It's section 8.6, "Efficient Implementation of Population-Count Function
> in 32-bit Mode", pages 179-180.

Thanks for doing this. The proof looks good except for what has been
already pointed out by Grant Grundler.

  parent reply	other threads:[~2006-02-02  9:34 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-31 16:49 linux
2006-01-31 18:14 ` Grant Grundler
2006-02-02  9:34 ` Balbir Singh [this message]
  -- strict thread matches above, loose matches on Subject: below --
2006-01-25 11:26 [PATCH 0/6] RFC: use include/asm-generic/bitops.h Akinobu Mita
2006-01-25 11:32 ` [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h Akinobu Mita
2006-01-25 20:02   ` Russell King
2006-01-25 20:59     ` Grant Grundler
2006-01-26  3:27       ` Akinobu Mita
2006-01-26  3:36         ` [PATCH 8/12] generic hweight{32,16,8}() Akinobu Mita
2006-01-26  7:12           ` Balbir Singh
2006-01-26 10:04             ` Rutger Nijlunsing
2006-01-27  4:55             ` Akinobu Mita
2006-01-27  5:40               ` Balbir Singh
2006-01-27  6:40                 ` Akinobu Mita
2006-01-31 11:14                   ` Balbir Singh
2006-01-26 18:57           ` Bryan O'Sullivan
2006-01-27  4:43             ` Akinobu Mita
2006-01-27  5:23               ` Bryan O'Sullivan

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