[Haskell-cafe] Mysterious factorial

[Daniel Fischer]

Am Mittwoch 30 Dezember 2009 17:28:37 schrieb Roel van Dijk:
> I can't offer much insight but could the answer lie in the Integer
> type? I suspect that with a sufficiently large fixed Int type (2^14
> bits?) the performance of the two functions would be almost equal.

For fact (10^6), we'd need rather 2^24 bits for the performance to be comparable.
Imagine such an ALU :D

>
> Could it be that the second function delays the multiplication of
> large numbers as long as possible? The divide-and-conquer approach?

Exactly.

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