#2271: floor, ceiling, round :: Double -> Int are awesomely slow ------------------------------------------+--------------------------------- Reporter: dons | Owner: daniel.is.fischer Type: bug | Status: patch Priority: low | Milestone: 7.0.1 Component: libraries/base | Version: 7.1 Keywords: performance, math, double | Testcase: Blockedby: | Difficulty: Unknown Os: Unknown/Multiple | Blocking: Architecture: Unknown/Multiple | Failure: None/Unknown ------------------------------------------+---------------------------------
Comment(by simonpj): > So the other obvious solution is to bring Double, Float and the functions into scope in GHC.Int and GHC.Word. That looks best, yes. It's best if a rule appears in the same module as at least one thing on the LHS of the rule. And if you look at these rules, they look like {{{ truncate Float Int8 x = (fromIntegral :: Int -> Int8) (truncate (x::Float)) }}} and indeed `Int8` appears on the left. Simon -- Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2271#comment:31> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler _______________________________________________ Glasgow-haskell-bugs mailing list Glasgow-haskell-bugs@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs