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

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Date:	Sat, 03 Mar 2012 14:03:17 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Jan Beulich <JBeulich@...e.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 03/02/2012 11:30 PM, Jan Beulich wrote:

>>>> 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.


Yes, you are right.
I take back this patch.

> 
> Jan
> 


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