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Eliminate boxing in takeWhile #4

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Yuras opened this issue Apr 5, 2016 · 0 comments
Open

Eliminate boxing in takeWhile #4

Yuras opened this issue Apr 5, 2016 · 0 comments
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performance

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@Yuras
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Yuras commented Apr 5, 2016

takeWhile uses Data.ByteString.span, which allocates one boxed Int, see haskell/bytestring#70

Basically it is a result of lack of nested CPR in ghc: https://ghc.haskell.org/trac/ghc/ticket/2289

Possible solution: write a hand optimized version of span, though it will uses bytestring internals, so will become a maintenance nightmare.

Task: measure the performance penalty because of boxing.
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