#13825: Allow multiple constructor fields occupy the same word -------------------------------------+------------------------------------- Reporter: michalt | Owner: michalt Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #605 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by dfeuer): * related: => #605 * milestone: => 8.4.1 Comment: `Bool` isn't special, and shouldn't be. It's just an enumeration type, and should remain one. #605 suggests representing unboxed enumeration types as `Int#`. It seems that to get what you want, you'd want to do something like what `Binary` and `Cereal` do with sum types, using a different number of bits depending on the number of constructors. One big question is whether and how to support sub-byte-sized fields. It is possible, presumably at some performance cost, to pack a `Bool` (for instance) into a single bit. Is the cost enough to worry about? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13825#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler