linux-ext4 - Re: [PATCH 3/6 -v3] libext2fs: add ext2fs

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Date:	Tue, 27 Nov 2012 14:37:49 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Zach Brown <zab@...bo.net>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 3/6 -v3] libext2fs: add ext2fs_bitcount() function

On Tue, Nov 27, 2012 at 09:50:23AM -0800, Zach Brown wrote:
> 
> Agreed.  I'll chuck it at the end of my fun-projects-some-day list as
> well, but getting it right for all the platforms that e2fsprogs
> supports.. meh :).

It's not strictly necessary to get things right for all platforms; we
already have some accelerations using asm statements which only work
for one platform already --- although it's already the case that I
didn't bother to make 64-bit set/clear/test bit optimizations for x86,
mainly because I didn't think it was worth it, especially on modern
CPU's.  (And with the red/black tree backend for bitmaps, the asm
bitops are even less important.)

							- Ted
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