#10148: Optimization causes repeated computation -------------------------------------+------------------------------------- Reporter: akio | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by nomeata): Thanks. It still relies on the bang in `gstep`. Also funny: Replacing `data Array' a = ALeaf a` by `newtype Array' a = ALeaf a` removes ''some'' repeated computation, but ''not all''. I’m curious about what causes this :-) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10148#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler