#2289: Needless reboxing of values when returning from a tight loop -------------------------------------+------------------------------------- Reporter: dons | Owner: Type: bug | Status: new Priority: lowest | Milestone: Component: Compiler | Version: 6.8.2 Resolution: | Keywords: boxing, | loops, performance Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #2387,#1600 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Yes, nested CPR would be great. See [wiki:NestedCPR] for Joachim's writeup of his work on it; lots of stuff there. Re one-specialisation: `SpecConstr` is free to generate lots of specialisations. But the demand analyser does not make many copies of a function, one for each demand pattern. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/2289#comment:47 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler