#8272: testing if SpLim=$rbp and Sp=$rsp changed performance at all -------------------------------------+------------------------------------- Reporter: carter | Owner: carter Type: task | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: | callingConvention Operating System: Unknown/Multiple | Architecture: x86_64 Type of failure: Runtime | (amd64) performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by michalt): @simonmar: When you say "terrible time walking the stack", you mean GC, right? I've did some more googling and also found [1] which describes some of the differences between the Haskell and C stacks (eg, the Haskell one is heap allocated and easy to grow, the C one is per capability, etc.) I agree - all of this makes it sound that if we want call/ret, we do need (1). Also I still don't really see how we could use `%rsp` in LLVM backend without pretty large changes (eg, using its stackmaps/safepoints). I have to admit that I'm also less enthusiastic about the whole idea after looking into it a bit. [1] https://www.reddit.com/r/haskell/comments/1wm9n4/question_about_stacks_in_ha... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8272#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler