ref: 5b307886fb965a23d28509c7740a599c703fbd11
parent: 6eb1254b883cae2d6c63af2263eaf8e18ba8f61a
author: Jim Bankoski <jimbankoski@google.com>
date: Tue Aug 6 04:25:10 EDT 2013
variance x86inc guards also fixed bug in sad calcs Change-Id: I6571fcbe37556c16ae32be66dc0fd879852aac1d