Download patch
ref: a810408cdcfce67a5e063cbf58cbeaa9be393127 parent: 136931c265bbe3a50bea42675adcf3a9ff28e890 author: Licai Guo <guolicai@gmail.com> date: Mon Feb 17 14:13:41 EST 2014
negative data with left shift, use cast or multiplication instead