I still wonder why there's this "a man writes more optimised code than compiler" stuff. Why?

Compiler is automated work, in the worst case it should be able to create multiple e.g. asms and compare the time, right? You can dump all instructions into compiler, it should be able to choose the right one even if it would compile whole days, right? You can't be possibly serious with such a statement.

No "time" arguments, please.