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From: John Baldwin <jhb@freebsd.org>
To: "Jung-uk Kim" <jkim@freebsd.org>
Subject: Re: svn commit: r253872 - in projects/atomic64/sys: amd64/include
 i386/include
Date: Tue, 6 Aug 2013 12:37:01 -0400
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On Thursday, August 01, 2013 7:20:32 pm Jung-uk Kim wrote:
> Author: jkim
> Date: Thu Aug  1 23:20:31 2013
> New Revision: 253872
> URL: http://svnweb.freebsd.org/changeset/base/253872
> 
> Log:
>   Allow any register to be used for the return value.

You need to clobber eax/rax then as cmpxchg always writes the current value to 
that register.

-- 
John Baldwin