Unfortunately, that dead-code optimization that makes such short work of your benchmark (possibly optimizing it all away) is not going to do quite as well with code that actually does something.

不幸的是，能够让您的评测工作非常短(可能会把评测完全优化掉)的死代码优化，在处理实际做些工作的代码时，做得就不会那么好了。