#6084: Add stg_ap_pnnv and related call patterns -------------------------------------+------------------------------------ Reporter: SimonMeier | Owner: simonmar Type: feature request | Status: patch Priority: high | Milestone: 7.8.1 Component: Runtime System | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: 8313 | Related Tickets: -------------------------------------+------------------------------------ Comment (by parcs): I updated the patch to accommodate `fun` with a temporary variable. Let me know what you think. This optimization only triggers four times inside the nofib testsuite: twice in `lift:Print.lhs` and twice in `n-body:Main.hs`. According to subsequent nofib runs, the runtime of these two programs is not affected by the optimization. Compile time doesn't seem to have been affected either. But, as mentioned before, the runtime of the program in #8313 is significantly improved: 0.75s vs 3.9s. I also uploaded a test for the testsuite. The test is essentially a modified version of the program in #8313 which checks that the program returns the expected result. But I'm not confident that this is the best way to go about testing this optimization. Do you have a better idea? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/6084#comment:32 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler