[Haskell-cafe] How to improve speed? (MersenneTwister is several times slower than C version)

[Lemmih]

On 11/2/06, Lennart Augustsson <lennart at augustsson.net> wrote:
> A big problem with the Mersenne Twister is the shifts.  As has been
> noted elsewhere, ghc doesn't do such a great job on those.

Actually, the shifts are only evaluated once (hurrah for lazy
evaluation) and with -funfolding-use-threshold=16 they're all compiled
to unchecked primitives (GHC.Prim.uncheckedShiftRL#).

-- 
Cheers,
  Lemmih