From: Andreas Schwab <schwab@suse.de>
To: "J.A. Magallon" <jamagallon@able.es>
Cc: Russell King <rmk@arm.linux.org.uk>,
       Michal Srajer <michal@mat.uni.torun.pl>,
       Linux Kernel List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] include/linux/etherdevice.h, kernel 2.6.14
References: <20051029141046.GA17715@ultra60.mat.uni.torun.pl>
	<20051029141757.GA14039@flint.arm.linux.org.uk>
	<20051029154027.GC17715@ultra60.mat.uni.torun.pl>
	<20051029160019.GB14039@flint.arm.linux.org.uk>
	<95B34D3D-B658-4933-81CF-4DA25BD0F37F@able.es>
Date: Sun, 30 Oct 2005 11:46:27 +0100
In-Reply-To: <95B34D3D-B658-4933-81CF-4DA25BD0F37F@able.es> (J. A. Magallon's
	message of "Sat, 29 Oct 2005 23:36:57 +0200")
Message-ID: <je7jbv5lks.fsf@sykes.suse.de>
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"J.A. Magallon" <jamagallon@able.es> writes:

> Just for curiosity, could you both benchmark this also:
>
> int is_zero_ether_addr0(const unsigned char *addr)
> {
>     return !(((unsigned long *)addr)[0] | ((unsigned short*)addr)[2]);
> }

It's probably slower when addr is unaligned, especially when unaligned
accesses need to be emulated.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstra?e 5, 90409 N?rnberg, Germany
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"And now for something completely different."
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