From owner-freebsd-net@FreeBSD.ORG  Mon Aug 20 16:49:31 2012
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 0888910656D8;
	Mon, 20 Aug 2012 16:49:31 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl [89.206.35.99])
	by mx1.freebsd.org (Postfix) with ESMTP id D53C68FC1E;
	Mon, 20 Aug 2012 16:49:24 +0000 (UTC)
Received: from wojtek.tensor.gdynia.pl (localhost [127.0.0.1])
	by wojtek.tensor.gdynia.pl (8.14.5/8.14.5) with ESMTP id q7KGmitp035334;
	Mon, 20 Aug 2012 18:48:48 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
	by wojtek.tensor.gdynia.pl (8.14.5/8.14.5/Submit) with ESMTP id
	q7KGmd0Y035331; Mon, 20 Aug 2012 18:48:43 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Mon, 20 Aug 2012 18:48:39 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Mitya <mitya@cabletv.dp.ua>
In-Reply-To: <50324DB4.6080905@cabletv.dp.ua>
Message-ID: <alpine.BSF.2.00.1208201844220.35173@wojtek.tensor.gdynia.pl>
References: <50324DB4.6080905@cabletv.dp.ua>
User-Agent: Alpine 2.00 (BSF 1167 2008-08-23)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.2.7
	(wojtek.tensor.gdynia.pl [127.0.0.1]);
	Mon, 20 Aug 2012 18:48:49 +0200 (CEST)
Cc: freebsd-hackers@freebsd.org, freebsd-net@freebsd.org
Subject: Re: Replace bcopy() to update ether_addr
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 20 Aug 2012 16:49:31 -0000

> #if defined(__i386__) || defined(__amd64__)
>    *dst = *src;
> #else
>    bcopy(src, dst, ETHER_ADDR_LEN);
#else
short *tmp1=((*short)src),*tmp2=((*short)dst);
*tmp2=*tmp1; *(tmp2+1)=*(tmp1+1); *(tmp2+2)=*(tmp1+2);

or use ++.

i think it is always aligned to 2 bytes and this should produce usable 
code on any CPU? should be 6 instructions on MIPS and PPC IMHO.