#15185: Enum instance for IntX / WordX are inefficient -------------------------------------+------------------------------------- Reporter: guibou | Owner: (none) Type: bug | Status: patch Priority: normal | Milestone: 8.10.1 Component: Core Libraries | Version: 8.4.2 Resolution: | Keywords: Newcomer Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4820 Wiki Page: | -------------------------------------+------------------------------------- Changes (by AndreasK): * keywords: => Newcomer Comment: The efficient implementation comes from `libraries/base/GHC/Enum.hs` where rules are defined. Implementing this should just be a matter of copying this approach for the other Int/Word variants. The correct place to put the rules for the Int/Word variants would be GHC.Int/GHC.Word in base. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15185#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler