#14295: tagToEnum# leads to some silly closures -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: datacon-tags Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): Replying to [comment:6 simonpj]:
Unsurprisingly, exactly the same thing is true for quotInt# and such.
I don't understand. Can you explain?
{{{#!hs foo :: (Int -> a) -> Int# -> Int# -> a foo f x y = f (I# (quotInt# x y)) }}} will suspend the division for fear of a zero denominator. We can fix that similarly by testing for 0 and forcing the division in the good branch. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14295#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler