#14948: A program which benefits from a late specialisation pass -------------------------------------+------------------------------------- Reporter: mpickering | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- In this repo there is a small program which performs much better with a late specialisation pass. There is a plugin which implements this pass. Instructions about how to build the repo are in the README. https://github.com/mpickering/legendary-train Without plugin {{{ time benchmarks () real 0m0.112s }}} With plugin (comparable to hand-written code) {{{ time benchmarks () real 0m0.049s }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14948 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler