[GHC] #5237: Inefficient code generated for x^2

[GHC]

#5237: Inefficient code generated for x^2
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    Reporter:  scpmw           |        Owner:                         
        Type:  bug             |       Status:  patch                  
    Priority:  normal          |    Milestone:  7.4.1                  
   Component:  libraries/base  |      Version:  7.0.3                  
    Keywords:                  |     Testcase:                         
   Blockedby:                  |   Difficulty:                         
          Os:  Linux           |     Blocking:                         
Architecture:  x86_64 (amd64)  |      Failure:  Runtime performance bug
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Comment(by daniel.is.fischer):

 Indded, it seems the specialisations were considered a better match at
 those types.
 Extra rules for the specialised types fire.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5237#comment:7>
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