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From: Christophe Lucas <clucas@rotomalug.org>
To: kernel-janitors@vger.kernel.org
Subject: Re: [KJ] what is best: memcpy or for
Date: Wed, 06 Dec 2006 08:34:48 +0000	[thread overview]
Message-ID: <20061206083448.GE24594@rotomalug.org> (raw)
In-Reply-To: <80ec54e90612052335v3688faedj6c64f979d420c078@mail.gmail.com>

Daniel Marjamäki (daniel.marjamaki@gmail.com) wrote:
> Hello!
> 
> I am wondering if there is any real difference between "for" and "memcpy"..
> 
>     int i, a[100], b[100];
> 
>     // method 1
>     for (i = 0; i < 100; i++)
>         a[i] = b[i];
> 
>     // method 2
>     memcpy(a, b, sizeof(a));
> 
> Is there any difference in speed?
> 
> With a good compiler, the output should be the same for both methods,
> shouldn't it?

Hi,

Perhaps I say mistake, but in kernel terms :

	http://lxr.linux.no/source/include/asm-i386/string.h?v=2.6.18#L203

regards,

	Christophe
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  reply	other threads:[~2006-12-06  8:34 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-06  7:35 [KJ] what is best: memcpy or for Daniel Marjamäki
2006-12-06  8:34 ` Christophe Lucas [this message]
2006-12-06 14:13 ` Matthew Wilcox
2006-12-06 15:25 ` Neil Horman
2006-12-07  4:59 ` Anupam Kapoor

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