https://qooah.com/2014/12/18/%e5%b0%8f%e7%b1%b3%e9%a6%96%e6%ac%be-64bit%e8%99%95%e7%90%86%e5%99%a8%e8%b7%91%e5%88%86%e6%88%90%e7%b8%be%e6%9b%9d%e5%85%89/