> Also, wouldn't the function call itself have an overhead? If yes, is there a
> way to get around it ?
>

Well, there exists some overhead at each "iteration", but if you've
got a fixed reference-time, these overheads wouldn't accumulate, so
after 2 or 1000 iterations you'd have about the same deviation.
As for the deviation itself, you just have to try and evaluate it with
your compiler/machine...

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