#11668: SPEC has a runtime cost -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Runtime Unknown/Multiple | performance bug Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- As far as I know, `SPEC` is merely intended to help the compiler identify calls for which constructor specialization may be help. Yet it's not erased! In fact, it has a runtime representation which we need to construct and pass around to so-marked calls. This likely isn't killing the performance of anyone's programs but surely we can do better than this. Really, the whole scheme of marking functions with `SPEC` (which as far as I know isn't even properly documented) seems quite odd. What is stopping us from simply attaching pragmas to equations? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11668 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler