[GHC] #4441: NCG miscompiles Double -> Float -> Double

[GHC]

#4441: NCG miscompiles Double -> Float -> Double
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    Reporter:  dterei            |        Owner:  simonmar                   
        Type:  bug               |       Status:  new                        
    Priority:  normal            |    Milestone:                             
   Component:  Compiler (NCG)    |      Version:  7.1                        
    Keywords:                    |     Testcase:                             
   Blockedby:                    |   Difficulty:                             
          Os:  Unknown/Multiple  |     Blocking:                             
Architecture:  x86               |      Failure:  Incorrect result at runtime
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Changes (by simonmar):

  * owner:  dterei => simonmar


Comment:

 Never mind, I see what the problem is.  The NCG is compiling
 `float2Double#` and `double2Float#` into NOP in the x86/x87 backend.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4441#comment:4>
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