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

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Message-ID: <20121127175423.GJ23854@lenny.home.zabbo.net>
Date:	Tue, 27 Nov 2012 09:54:23 -0800
From:	Zach Brown <zab@...bo.net>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 3/6 -v3] libext2fs: add ext2fs_bitcount() function

On Mon, Nov 26, 2012 at 08:45:05PM -0500, Theodore Ts'o wrote:
> build- and run-time machinery (i.e., detecting whether the gcc you're
> compiling with supports __builtin_popcount, and implementing a
> run-time fallback is the CPU doesn't support popcount instruction ---
> which by the way isn't properly part of SSE 4.2; it has its own
> separate CPUID bit, IIRC).

*nod*

> Is there some userspace application licensed under LGPLv2 which does
> this cleanly from which I could borrow code?

Not that I know of, off the top of my head.  I think I'd first check the
usual crypto suspects :).

- z
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