netdev - Re: [PATCH net-next] fast_hash: clobber registers correctly for inline function use

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Message-ID: <1415997733.15154.62.camel@localhost>
Date:	Fri, 14 Nov 2014 21:42:13 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Cong Wang <cwang@...pensource.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Pravin B Shelar <pshelar@...ira.com>,
	Jesse Gross <jesse@...ira.com>, jay.vosburgh@...onical.com,
	discuss@...nvswitch.org
Subject: Re: [PATCH net-next] fast_hash: clobber registers correctly for
 inline function use

On Fr, 2014-11-14 at 11:02 -0800, Cong Wang wrote:
> 
> I am wondering, compare with alternative call, how slower is just
> testing
> cpu_has_xmm4_2?

I can test, but cpu_has_xmm4_2 expands into quite some code. I don't
know if indirect function call or a test of this flag is faster. I'll
test this.

Bye,
Hannes


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