#9291: Don't reconstruct sum types if the type subtly changes -------------------------------------+------------------------------------- Reporter: schyler | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.2 Component: Compiler | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Moderate (less Unknown/Multiple | than a day) Type of failure: | Blocked By: None/Unknown | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonpj): Replying to [comment:17 carter]:
could this be done ethically at the STG or CMM layer if we were able to keep enough information lying around at those layers?
Yes, I think it could; both are much less strongly typed than Core. STG would be much better than CMM. There isn't currently an STG optimisation pass, but you could add one. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9291#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler