| One thing puzzles me, though. Maybe someone here will have an | explanation. I added a test case to my benchmark for isSpace | *imported* from Data.Char. The imported isSpace benchmarks | much faster (up to 5X) than the isSpace_DataChar, even though the latter has | the same definition as the former. Wren Thronton noticed this too, | and suggests (in | http://community.haskell.org/~wren/bytestring- | lexing/test/bench/BenchIsSpace.hs) | that the difference "appears to be something special in how the base | library was compiled," but I have no idea what that could be. A way to reproduce this would be good. (If so, open a ticket.) The only thing I can think of is that libraries may be compiled with -O2, and that might make a difference. Simon | -----Original Message----- | From: libraries-bounces@haskell.org [mailto:libraries-bounces@haskell.org] On | Behalf Of John MacFarlane | Sent: 28 October 2012 23:35 | To: Edward A Kmett | Cc: libraries@haskell.org | Subject: Re: Improving Data.Char.isSpace performance | | +++ Edward A Kmett [Oct 28 12 17:08 ]: | > It might be worth hunting for similar low hanging fruit as well. | | No doubt a similar approach would work for isLetter, isDigit, | toUpper, toLower, etc. | | One thing puzzles me, though. Maybe someone here will have an | explanation. I added a test case to my benchmark for isSpace | *imported* from Data.Char. The imported isSpace benchmarks | much faster (up to 5X) than the isSpace_DataChar, even though the latter has | the same definition as the former. Wren Thronton noticed this too, | and suggests (in | http://community.haskell.org/~wren/bytestring- | lexing/test/bench/BenchIsSpace.hs) | that the difference "appears to be something special in how the base | library was compiled," but I have no idea what that could be. | | John | | | _______________________________________________ | Libraries mailing list | Libraries@haskell.org | http://www.haskell.org/mailman/listinfo/libraries