[GrantMoyer]

> The reality is that for any language, including C, compiler optimized code will never be as fast as hand optimized code

That's not strictly true; sometimes a C compiler can optimize away my whole program: https://godbolt.org/z/oG5nfGE6z

[wyager]

You're doing extremely simple constant arithmetic here. GHC can optimize this type of thing away to nothing as well. Are we talking about contrived examples or real numerical bottlenecks?

[Twisol]

I think it was a joke about compilers removing code by reasoning about undefined behavior.