[Haskell-cafe] Re: Write Haskell as fast as C. [Was: Re: GHC predictability]

[Bryan O'Sullivan]

Andrew Coppin wrote:

> On the other hand, this is the anti-theisis of Haskell. We start with a
> high-level, declarative program, which performs horribly, and end up
> with a manually hand-optimised blob that's much harder to read but goes
> way faster.

Buh?  This is hard to read?

mean n m = go 0 0 n
  where go s l x | x > m      = (s::Double) / fromIntegral (l::Int)
                 | otherwise  = go (s+x) (l+1) (x+1)

One can in fact imagine a world in which the compiler does this
transformation for you, though it takes a bit of squinting.

http://reddit.com/r/programming/info/6jjhg/comments/c040ybt

	<b