#5075: CPR optimisation for sum types if only one constructor is used ---------------------------------+------------------------------------------ Reporter: batterseapower | Owner: simonpj Type: feature request | Status: patch Priority: normal | Milestone: 7.6.2 Component: Compiler | Version: 7.0.3 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: None/Unknown Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Comment(by simonpj): Still to come: the sum-CPR stuff is switched off for '''nested''' functions because it turns some let-no-escape functions into non-let-no- escape ones, which increases allocation. I'm hopeful that Nick F's work on late-lambda-lifting may solve this, in which case we can switch it on more vigorously. Hence leaving open for now. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/5075#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler