#9655: Do not UNPACK strict fields that are very wide -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Resolution: | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: | Blocked By: None/Unknown | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonpj): Ah. In that case I'm puzzled. The strictness analyser does worker/wrapper split that does not take account of the width of the argument product, which is more defensible than in unpacking wide data type declarations. But in that case * I don't think that removing the "!" would make a difference. * We might get a worker with lots of arguments but I don't see why that would increase compile times. John: if you feel motivated, could you boil out a reproducible test case? If you use `-dshow-passes` on your current set-up, I think you'll see that the size of one of the intermediate stages blows up when you have the "!" vs not having it. So you can use that unexpected size blow-up instead of looking for very long compile times (which can get a bit painful). Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9655#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler