#6135: Unboxed Booleans ---------------------------------+------------------------------------------ Reporter: benl | Owner: jstolarek Type: feature request | Status: new Priority: normal | Milestone: 7.8.1 Component: Compiler | Version: 7.4.1 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: None/Unknown Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: #605 | ---------------------------------+------------------------------------------ Comment(by simonmar): I agree with Simon, I think we already got a lot of the benefit to be had here from pointer tagging. Perhaps for enums larger than the threshold (3 or 7 for 32-bit or 64-bit respectively) we should be unboxing them in worker/wrapper. It wouldn't be hard to write some examples by hand and measure the difference between using enums and `Int#`. I would like to see the simplification I mentioned above - changing the comparison primops to return `Int#` rather than `Bool` - and I believe that would lead to more optimisations later. At the least it would expose the magic `tagToEnum#` that arises from these primops to the simplifier, where it could be optimised away. -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/6135#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler