21 May
2007
21 May
'07
6:22 a.m.
Neil Mitchell wrote:
Hi
Want to try also the Data.ByteString.Base.isSpaceWord8 :: Word8 -> Bool
isspace: 0.375 iswspace: 0.400 ByteString: 0.460 Char: 0.672
Not as fast as isspace/iswspace, but quite a bit faster than Char. Perhaps someone needs to take a peek at the generated ASM for each of these routines and see where the Haskell one is falling down.
Depending on the platform, iswspace might not be checking the full Unicode character space here: on Linux it doesn't unless you have LANG set, I think. The Data.Char version does support full Unicode. That's not to say we couldn't improve things here, I'm sure we can. Cheers, Simon