linux-kernel - Re: [PATCH] arch/tile: Rename the hweight() implementations to __arch

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Message-ID: <AANLkTinUtn9noO-UwNSkNnb94OaQuK-x8-okSQDiD++4@mail.gmail.com>
Date:	Fri, 13 Aug 2010 21:02:31 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	Borislav Petkov <petkovbb@...glemail.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] arch/tile: Rename the hweight() implementations to __arch_hweight().

On Fri, Aug 13, 2010 at 20:32, Chris Metcalf wrote:
> Mike, thanks for the pointer to the hweight issue.  Since we are using
> __builtin_popcount() and the compiler can do constant propagation, etc.,
> with it at compile-time, this is less critical, but it seems like the
> easiest way to get the definitions of the HWEIGHT macros.

interesting ... i wasnt aware of the popcount builtin.  the Blackfin
ISA has a "ONES" insn which does this.  guess we should implement the
popcount builtin too.
-mike
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