linux-kernel - Re: Can anyone explain "movl %eax %eax"?

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Message-Id: <20110209.150514.115926470.davem@davemloft.net>
Date:	Wed, 09 Feb 2011 15:05:14 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jidong.xiao@...il.com
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: Can anyone explain "movl %eax %eax"?

From: Jidong Xiao <jidong.xiao@...il.com>
Date: Wed, 9 Feb 2011 18:02:09 -0500

> Oh, I see. Thank you. So similarly, the operation "xorl %eax,%eax" is
> used for the same reason, right? I see that appears in more files.

The xorl clears the entire register.
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