#9233: Compiler performance regression -------------------------------------+------------------------------------- Reporter: augustss | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Differential Revisions: Phab:D73 | Operating System: Windows Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | -------------------------------------+------------------------------------- Comment (by goldfire): Success. The two commits above apply different optimizations to different coercion functions, vastly speeding up the test case. If I increase the size of `X` to include 200 fields, profiling tells me that coercion- oriented functions take about 6% of the ~3 second (MUT) running time. Before these optimizations, the coercion functions were taking up ~98% of the running time, so this is an improvement. :) Before closing the ticket, would someone else like to test the work and confirm that the speedup is enough to close the issue? Lennart, how does this affect your compilation times? I wouldn't be surprised if these commits make a sizable difference: each commit removed potentially- exponential behavior. In any case, I'm stopping work on this for now. Let me know if I need to resume somewhere. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9233#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler