From mboxrd@z Thu Jan  1 00:00:00 1970
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 2/5] bitops: compile time optimization for hweight_long(CONSTANT)
Date: Wed, 03 Feb 2010 09:11:16 -0800
Message-ID: <4B69AE34.9070704@zytor.com>
References: <20100130094515.475881280@intel.com>	 <20100130094957.692671259@intel.com>	 <20100201124825.cc024f2a.akpm@linux-foundation.org>	 <20100203133951.GA24357@localhost>	 <20100203070825.e36b3932.akpm@linux-foundation.org>	 <1265210157.24455.646.camel@laptop>	 <20100203074251.e2caa3f3.akpm@linux-foundation.org> <1265212054.24455.680.camel@laptop>
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Cc: Andrew Morton <akpm@linux-foundation.org>,
	Wu Fengguang <fengguang.wu@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Jamie Lokier <jamie@shareable.org>,
	Roland Dreier <rdreier@cisco.com>,
	Al Viro <viro@ZenIV.linux.org.uk>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	Ingo Molnar <mingo@elte.hu>
To: Peter Zijlstra <peterz@infradead.org>
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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.