Improving Data.Char.isSpace performance

Joachim Breitner mail at
Thu Nov 1 16:10:26 CET 2012


Am Donnerstag, den 01.11.2012, 14:24 +0100 schrieb Joachim Breitner:
> have you considered investigating whether the ffi call can be sped up?
> To me it seems to be a bit overheady to first check in Haskell-Land for
> common cases and then call code that would (or does?) this check as
> well.

looking at the interface of GHC.Unicode I see that the special cases are
included in the unfolding of isSpace. This is, of course, something that
that even a faster ffi variant cannot achieve.


Joachim "nomeata" Breitner
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