#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 rwbarton): Well, initial results are somewhat inconclusive: {{{ Min -0.1% -0.1% -6.3% -6.2% -7.4% Max +0.1% +0.0% +7.5% +7.5% +3.6% Geometric Mean -0.0% -0.0% -0.2% -0.2% -0.0% }}} I believe the large variations are due to the same kind of issues I encountered in #8279. Got sucked into investigating that for a while, with no real progress. Anyways it seems like it ought to be a clear win; what's the best way to implement this for real? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9660#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler