I can't speak to Julia's branch prediction, but if you rewrite it as
function f{x}(::Val{x}) ...
...
end
f(Val{True})
then the compiler will create two versions of f, one with the if and one
without. Then you can @time the results and see if it makes a difference.
On Tuesday, August 2, 2016 at 5:29:41 AM UTC-4, esproff wrote:
>
> So let's say I have a function of the form:
>
> function f(x::Bool)
> for i in 1:10000000
> *(bunch of stuff)*
> if x
> do something
> end
> *(even more stuff)*
> end
>
> As you can see I only need to evaluate this if statement once, but instead
> I'm (in theory) evaluating it millions of times. How good is Julia's
> branch prediction? Does Julia's JIT compiler recognize this and make it so
> the if statement is only evaluated once?
>
