https://blog.wongcw.com/2019/01/14/%e8%a2%ab%e8%bb%9f%e9%8a%80%e6%94%b6%e8%b3%bc%e7%9a%84arm%e9%96%8b%e6%8b%93%e9%9d%9e%e6%99%ba%e8%83%bd%e6%89%8b%e6%a9%9f%e5%b8%82%e5%a0%b4%ef%bc%9a%e6%ba%96%e5%82%995%e5%b9%b4%e5%85%a7ipo/