linux-kernel - Re: [PATCH 2/5] bitops: compile time optimization for hweight

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Date:	Sun, 14 Feb 2010 13:23:35 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <petkovbb@...glemail.com>
Cc:	Borislav Petkov <bp@...64.org>, "H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jamie Lokier <jamie@...reable.org>,
	Roland Dreier <rdreier@...co.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH 2/5] bitops: compile time optimization for
 hweight_long(CONSTANT)

On Sun, 2010-02-14 at 12:24 +0100, Borislav Petkov wrote:
> 
> So, if I understand you correctly, your suggestion might work, we
> simply need to rename the lib/hweight.c versions to __sw_hweightN
> and have <asm-generic/bitops/arch_hweight.h> have __arch_hweightN ->
> __sw_hweightN wrappers in the default case, all arches which have an
> optimized version will provide it in their respective bitops header...
> 
I'm not quite sure what the last 'it' refers to, does that refer to:
 1) an __arch_hweightN() implementation, or
 2) __arch_hweightN() -> __sw_hweightN() wrappers ?

If you meant 1, then yes.

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