[GHC] #5166: Wrong calculation with Int64

[GHC]

#5166: Wrong calculation with Int64
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    Reporter:  malphunction    |       Owner:                             
        Type:  bug             |      Status:  new                        
    Priority:  normal          |   Component:  Runtime System             
     Version:  6.12.3          |    Keywords:                             
    Testcase:                  |   Blockedby:                             
          Os:  Linux           |    Blocking:                             
Architecture:  x86_64 (amd64)  |     Failure:  Incorrect result at runtime
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Comment(by kosmikus):

 The behaviour of GHC looks correct to me. The "correct" result is beyond
 the maxBound of Int64 (and even Word64), so you have an overflow.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5166#comment:1>
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