#9630: compile-time performance regression (probably due to Generics) -------------------------------------+------------------------------------- Reporter: hvr | Owner: 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): Wiki Page: | -------------------------------------+------------------------------------- Comment (by thoughtpolice): Just as an aside, I also applied the trick from comment:23 to cereal, and the results were almost unbelievable. The example given (comment:22) actually completely exhausts the simplifier tickets, so it essentially turns a non-compiling program into a compiling one that works in less than a second. https://github.com/GaloisInc/cereal/commit/94c87592d010fdb381c6a2dc963bbfcef... The result on the `binary-serialise-cbor` suite with this change is incredible. Just another data point - it would be useful to minimize `cereal` akin to `binary` in comment:22 and see the difference. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9630#comment:34 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler