Re[2]: [Haskell-cafe] How to improve speed? (MersenneTwister is several times slower than C version)

Hello Lennart, Thursday, November 2, 2006, 4:34:04 AM, you 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.

#ifdef __GLASGOW_HASKELL__ (I# a) <<# (I# b) = (I# (a `iShiftL#` b)) (I# a) >># (I# b) = (I# (a `uncheckedIShiftRL#` b)) #else /* ! __GLASGOW_HASKELL__ */ a <<# b = a `shiftL` b a >># b = a `shiftR` b #endif /* ! __GLASGOW_HASKELL__ */ -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com