#7258: Compiling DynFlags is jolly slow
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Reporter: simonpj | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.6.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: None/Unknown
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Compiling `DynFlags` really takes a long time these days.
Ian thinks that it's due to the `Read` and `Show` instances he has added
(see attached `W2.hs`.
Simon M suggests: instead of using `Read/Show`, you could generate some
code in `mkDerivedConstants` to use `ReadP` and `Outputable`, which should
be much smaller and faster.
This ticket is
* To see if we can speed up compilation of `DynFlags`
* To check WHY it is so slow. Are there any lessons we can learn or ways
to make it compile faster? Is it tickling some asymptotically-bad corner
of the compiler?
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7258>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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