linux-kernel - Re: [RFC patch] cmpxchg_double: remove local variables to get better performance

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Message-Id: <4F50F594020000780007612D@nat28.tlf.novell.com>
Date:	Fri, 02 Mar 2012 15:30:12 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Alex Shi" <alex.shi@...el.com>
Cc:	<jeremy@...p.org>,
	"asit.k.mallick@...el.com" <asit.k.mallick@...el.com>,
	"x86@...nel.org" <x86@...nel.org>, <tglx@...utronix.de>,
	"Andi Kleen" <ak@...ux.intel.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>
Subject: Re: [RFC patch] cmpxchg_double: remove local variables to get
 better performance

>>> On 02.03.12 at 16:12, Alex Shi <alex.shi@...el.com> wrote:
> On 03/02/2012 05:11 PM, Jan Beulich wrote:
>> In particular, requiring an L suffix here on literals should be avoided.
> 
> 
> Even the each macro may save 0x40 bytes text, and bring more 10%
> execution speed?

Again - if you see meaningful text size differences with optimization
properly enabled, this may need investigation at the compiler end.

Jan

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