#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 simonpj): Akio, good work. But I would be reluctant to zap demand info: * Occurrence info is syntactic, and changes often, so needs to be zapped * Demand info is (supposed to be) semantic, and so should not change, except that the demand might get stronger; it is a static analysis after all. So my diagnosis is that the demand analyser is wrong. Consider -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10148#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler