#9233: Compiler performance regression -------------------------------------+------------------------------------- Reporter: augustss | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Differential Revisions: Phab:D73 | Operating System: Windows Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: Difficulty: Unknown | Blocking: Blocked By: | Related Tickets: | -------------------------------------+------------------------------------- Comment (by simonpj): Some questions for Richard: * In the first commit "Rewrite coercionRole", there is a small change in `OptCoercion`, whicg does entirely un-commented. What's it about? Could you comment it? A Note? * In the new `OptCoercion` (after both commits) I see that `opt_co1` is called only with `Nothing` as its third arg. So can we get rid of that arg? * Ditto `opt_co2`. (In contrast `opt_co3` does have non-Nothing calls. It's the only one that does. * Do those changes change something in `Note [Optimising coercion optimisation]`? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9233#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler