#8766: length [Integer] is twice as slow but length [Int] is 10 times faster --------------------------------------------+------------------------------ Reporter: George | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime performance bug | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by nomeata): The improvement for `Int` is most likely from 82f56e5 (#876). But I guess the important point of the ticket is the regression for `Integer`. Maybe it is because of #8638? There might now be many checks whether the value fits in a `S#` that were not done before. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8766#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler