#9660: unnecessary indirect jump when returning a case scrutinee -------------------------------------+------------------------------------- Reporter: rwbarton | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 (CodeGen) | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Runtime | Related Tickets: performance bug | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonmar): It ought to be a clear win. To be extra sure I'd compare the sizes of object files in nofib built both ways, find some object files that differ, and then compare the assembly output for those modules, just to be sure that nothing unexpected is happening. I'd also double-check any nofib results that appear to vary by more than a few percent. You can use perf to count instructions, which should go down. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9660#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler