[GHC] #1434: Slow conversion from Double to Int

[GHC]

#1434: Slow conversion from Double to Int
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    Reporter:  ghc@…                      |        Owner:                         
        Type:  task                       |       Status:  new                    
    Priority:  normal                     |    Milestone:  6.12 branch            
   Component:  libraries/base             |      Version:  6.4.1                  
    Keywords:  rules                      |   Difficulty:  Unknown                
          Os:  Unknown/Multiple           |     Testcase:                         
Architecture:  Unknown/Multiple           |      Failure:  Runtime performance bug
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Comment(by isaacdupree):

 Does this RULE work on 32-bit, where Int is not as big as Int64? (I'm
 dubious)

 "truncate/Double->Int64"
     truncate = fromIntegral . double2Int :: Double -> Int64

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1434#comment:17>
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