From owner-freebsd-hackers@FreeBSD.ORG  Wed Aug 22 20:28:48 2012
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 693D1106566B;
	Wed, 22 Aug 2012 20:28:48 +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 0B77E8FC1B;
	Wed, 22 Aug 2012 20:28:37 +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 q7MJsdZ0061881;
	Wed, 22 Aug 2012 21:54:40 +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
	q7MJsWkq061878; Wed, 22 Aug 2012 21:54:36 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Wed, 22 Aug 2012 21:54:32 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Adrian Chadd <adrian@freebsd.org>
In-Reply-To: <CAJ-Vmo=1cbJn3pkSvoCq7y-kEGig-h1Vxo6M5V0=b9=MkfuMRA@mail.gmail.com>
Message-ID: <alpine.BSF.2.00.1208222153180.61877@wojtek.tensor.gdynia.pl>
References: <50324DB4.6080905@cabletv.dp.ua>
	<420BA06C-C776-47DB-B3BB-F1414C115F99@bsdimp.com>
	<CAJ-VmokQLD6YgyrsOyez=3cLm4Q8jZOnJ9vo4Wq3sjRu+G-E7A@mail.gmail.com>
	<201208220802.14588.jhb@freebsd.org>
	<CAJ-Vmo=1cbJn3pkSvoCq7y-kEGig-h1Vxo6M5V0=b9=MkfuMRA@mail.gmail.com>
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]);
	Wed, 22 Aug 2012 21:54:42 +0200 (CEST)
Cc: freebsd-hackers@freebsd.org, Mitya <mitya@cabletv.dp.ua>,
	freebsd-net@freebsd.org
Subject: Re: Replace bcopy() to update ether_addr
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 22 Aug 2012 20:28:48 -0000

> but wonder whether the same does hold for MIPS/ARM. Getting it wrong
> there will lead to some very very poor performing code.
>
1) do - as already pointed out - standard copy of structure in C.
2) if compiler is found to generate bad code on some archs put assembly.

1 even if compiler is not smart is already far better than calling a 
function to copy 6 bytes that is plain stupid.