[GHC] #10120: Unnecessary code duplication from case analysis

[GHC]

#10120: Unnecessary code duplication from case analysis
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        Reporter:  bgamari           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1-rc2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by nomeata):

 The GHC 7.8 code looks good to me – I would expect later stages in the
 pipeline to make good code from such a case on an enumeration type. Did
 you have a look at the actual generated code for that?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10120#comment:7>
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