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ref: 57bd721b2f082801590a8ebe9b03e52a08a56f18 parent: 82a0d3e4a2236e3913b91e7e36e19dc667bc2a80 author: huili2 <huili2@cisco.com> date: Mon Jun 8 07:06:32 EDT 2015
add sub8x8 mode decision functions