Improving Data.Char.isSpace performance

Joachim Breitner mail at
Thu Nov 1 14:24:29 CET 2012


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

Maybe the overhead for calling the C code can be reduced so that it is
no longer worth doing special casing in the Haskell code. Maybe using
primitive operations instead of the C calling convention help, as it
would effectively inline the call to u_iswspace?


Joachim "nomeata" Breitner
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