#1600: Optimisation: CPR the results of IO -------------------------------------+------------------------------------- Reporter: simonmar | Owner: (none) Type: task | Status: new Priority: lowest | Milestone: Component: Compiler | Version: 6.6.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #8598 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): What is the status of this, akio?

I wonder if this improvement justifies the added complexity to the compiler (about 400 lines of code added under `compiler/`). Right now I don't see any way to make the analysis/transformation more effective.

Well, 2.6% improvement in runtime is quite sizeable. This sounds quite worthwhile to me. Good work! Simon, do you agree? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/1600#comment:74 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler