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

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Message-ID: <4B69AE34.9070704@zytor.com>
Date:	Wed, 03 Feb 2010 09:11:16 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	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>
Subject: Re: [PATCH 2/5] bitops: compile time optimization for hweight_long(CONSTANT)

On 02/03/2010 07:47 AM, Peter Zijlstra wrote:
> 
> From what I know the popcnt ins on x86 is relatively new, hpa was going
> to look at supporting it using alternatives.
> 

And kernel-specific stuff like alternatives is pretty much the one thing
that gcc *can't* do for us.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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