#15519: Minor code refactoring leads to drastic performance degradation -------------------------------------+------------------------------------- Reporter: danilo2 | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.8.1 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: SpecConstr Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
This is very interesting. Would you be so nice and tell me jsut a
little more aobut it - where can I learn about it and why such design decisions were made? I'm afraid I have never written a paper about eta-expansion, despite its importance to GHC. There are extensive Notes in * `CoreArity.hs` (which is all about arity and eta expansion) * `SimplUtils.hs` (around `tryEtaExpandRhs` and `tryEtaReduce`) I think that's the best I can do without a big investment -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15519#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler