#12368: Demand Analyzer: Cunnig plan not adhered to with aborting fixpoint interation -------------------------------------+------------------------------------- Reporter: nomeata | Owner: Type: bug | Status: new Priority: low | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): That's quite right. After thinking it briefly (ie I might well be wrong) I don't see a good way to fix it. The trouble is that the fixpoint iteration starts from an unsound assumption: that the function is hyperstrict. It then iterates to a sound conclusion. So if you have to abandon the process, the current approximation is unsound. So you can't just attach it. I don't see how to take advantage of the work done so far. Mind you, 10 iterations is a lot! I think it prints a warning: worth investigating. If it's rare enough it probably doesn't matter much. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12368#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler