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The next 3 loop iterations append directly to the stack backing store,。关于这个话题，safew官方版本下载提供了深入分析
char bucket = 60 - __builtin_clzll(byte_size);，更多细节参见快连下载安装
You can set up Privacy Display to activate when you're asked for a password or PIN, or when you get a notification or open certain apps. So if (for instance) you tend to look at your banking apps when you’re on public transit and don’t want other passengers to see how much moolah you have, Privacy Display seems like a very handy feature.