#10034: Regression in mapM_ performance -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: ekmett Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Core Libraries | Version: 7.10.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: Phab:D632 -------------------------------------+------------------------------------- Comment (by simonpj): I still don't follow from comment:2 where the performance loss you describe is coming from, nor why inlining `mapM` will help. If you do have a clear idea, can you ''construct'' an example? Switch off Call Arity if you like. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10034#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler