Ben Would you like to take a look, since you initiated this :-). We need a definite win to make it worth it. Simon | -----Original Message----- | From: ghc-tickets-bounces@haskell.org [mailto:ghc-tickets- | bounces@haskell.org] On Behalf Of GHC | Sent: 13 March 2013 14:19 | Cc: ghc-tickets@haskell.org | Subject: Re: [GHC] #6135: Unboxed Booleans | | #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 jstolarek): | | I implemented a prototype version of new comparison primops. They | compare two `Int#`s but as a result they return either `0#` (denoting | False) or `1#` (denoting True) instead of returning a `Bool`. Now the | results of comparing can be combined using bitwise `orI#`, `andI#`, | `xorI#` and `notI#` primops, which addresses the original problem that | was reported (at least partially). I'm attaching patches for GHC and | the testsuite (includes some cleanup of my other code for testing | primops). These patches are for review and discussion purposes - they | are not yet ready for integration because they don't contain primops | for comparing values of type `Word#`, `Float#` and `Double#`. I will | implement comparisons for these types once I am certain that I got | things right with `Int#`. | Feedback will be much appreciated. | | -- | Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/6135#comment:21 | GHC http://www.haskell.org/ghc/ | The Glasgow Haskell Compiler | | _______________________________________________ | ghc-tickets mailing list | ghc-tickets@haskell.org | http://www.haskell.org/mailman/listinfo/ghc-tickets