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  • Glasgow Haskell Compiler
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  • #7258

Closed
Open
Created Sep 20, 2012 by Simon Peyton Jones@simonpjDeveloper

Compiling DynFlags is jolly slow

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

Trac metadata
Trac field Value
Version 7.6.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
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