#9630: compile-time performance regression (probably due to Generics) -------------------------------------+------------------------------------- Reporter: hvr | Owner: dfeuer Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 7.9 Resolution: | Keywords: deriving- | perf, Generics Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #9583, #10293, | Differential Rev(s): #13059, #10818 | Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): Argh! I was stupid again, in a different way. When I was trying out the old-style generics for `binary`, I forgot that my stage1 was 8.0.2, which is no good for that. When I used GHC 8.2.1 as the stage1, it built just fine. Using the merged classes ''and'' inlines to compile `Language.Haskell.Extension` takes 9 seconds, whereas with the split class and no inlines it takes 7. So I think this actually is fixed now. I'll put together a test case. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9630#comment:53 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler