#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): Phab:D3656 #13059, #10818 | Wiki Page: | -------------------------------------+------------------------------------- Changes (by dfeuer): * differential: => Phab:D3656 Comment: I've added a test demonstrating improvement from the specializer change. It's not as precise as I'd like. A variation (moving the definition of `T` into the `T9630a` module while leaving the specialization in `T9630`) has more dramatic effects, with simplifier tick exhaustion in the older GHC. But as mentioned, a similar modification of Edward's test case does ''not'' see any improvement. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9630#comment:64 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler