On Thu, Apr 29, 2010 at 10:54:09AM +0200, Ketil Malde wrote:
> Anyway - it occurs to me that this can fairly simply be sped up by
> parallelizing: chunk the input, complement chunks in parallel, and
> reverse. Any takers?
Do you mean, something like this?
import Data.ByteString.Char8 as S
import Data.ByteString.Lazy.Char8 as L
import Data.ByteString.Lazy.Internal as LI
map' :: (Char -> Char) -> L.ByteString -> L.ByteString
map' f = go
where
go LI.Empty = LI.Empty
go (LI.Chunk x xs) = let fx = S.map f x
fxs = go xs
in fxs `par` LI.Chunk fx fxs
-- Chunk is strict in fx.
Cheers,
--
Felipe.
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