Fwd: [Haskell-beginners] Optimization Problem
daniel.is.fischer at web.de
Mon Aug 9 22:35:31 EDT 2010
On Tuesday 10 August 2010 04:02:32, Daniel Fischer wrote:
> It could, but it doesn't (at least not in core). Most of the time it
> doesn't make a significant difference whether you use (x ^ 2) or (x *
> x), but sometimes it can make a big difference (we had an example
> earlier this year, but I can't seem to find it now).
Finally found it:
shows an example where the use of (x ^ 2) instead of (x * x) prevented
sharing of a common subexpression, thus creating an O(2^n) algorithm from
what rightfully was an O(n) algorithm.
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