linux-kernel - RE: [PATCH RFC] [X86] performance improvement for memcpy

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Date:	Wed, 11 Nov 2009 15:57:31 +0800
From:	"Ma, Ling" <ling.ma@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RFC] [X86] performance improvement for memcpy_64.S by
 fast string.

Hi Ingo

This program is for 64bit version, so please use 'cc -o memcpy  memcpy.c -O2 -m64'

Thanks
Ling

>-----Original Message-----
>From: Ingo Molnar [mailto:mingo@...e.hu]
>Sent: 2009年11月11日 15:19
>To: Ma, Ling
>Cc: H. Peter Anvin; Ingo Molnar; Thomas Gleixner; linux-kernel
>Subject: Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast
>string.
>
>
>* Ma, Ling <ling.ma@...el.com> wrote:
>
>> Hi All
>> Please use the memcpy.c(cc -o memcpy memcpy.c -O2) to test more cases,
>> if you have interest. In this program we did simple modification
>> on memcpy_new function.
>
>FYI:
>
>earth4:~/s> cc -o memcpy memcpy.c -O2
>memcpy.c: In function 'do_one_throughput':
>memcpy.c:45: error: impossible register constraint in 'asm'
>memcpy.c:53: error: impossible register constraint in 'asm'
>memcpy.c:47: error: impossible register constraint in 'asm'
>memcpy.c:53: error: impossible register constraint in 'asm'
>
>	Ingo