#7198: New codegen more than doubles compile time of T3294 -------------------------------------+------------------------------------- Reporter: simonmar | Owner: simonmar Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.4.2 (CodeGen) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #4258 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by michalt): Right, that makes sense - I think I made a wrong assumption that always put the value of `node` (`R1`) register also into a local register (that's what was happening in all my experiments). But that's probably not the case in general (which would invalidate the stored memory loads). Thanks for explanations! As for sinking everything later, as I far as I understand, this ticket is about trying to avoid generating so much Cmm even if it would get sinked later on (because it hurts compile time and sinking pass is not run actually on `-O0`). In any way, I agreed that this might not be the best idea if the free variables are reused multiple times. I'll keep poking around and ping this issue once I have a better idea :-) (or someone else comes up with one) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7198#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler