#8456: Control flow optimisations duplicate blocks --------------------------------------------+------------------------------ Reporter: jstolarek | Owner: jstolarek Type: bug | Status: new Priority: high | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime performance bug | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: 8275 | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by simonmar): Simon - the set of blocks is updated as we go along (there's a foldr at the top). So it does what you're suggesting. For a backward goto to a goto, I was imagining that the forward goto would be concatenated with its destination. But it might not be, if the destination has multiple predecessors, so I withdraw my suggestion. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8456#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler