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Maybe I should take this back:



It's actually not that bad a reason if it simplifies the code in a case like this, but it is not a path to optimizing performance either.

So why not just make it iterative to start with?



Yeah, that is part of the overhead of a function call, and the address is copied. However, copying a pointer is extremely trivial, I think...

You have it backward. Iterating a function call will not increase your "overhead". But recursion surely will.



Using globals might provide an advantage, but goto won't.