[GHC] #8317: Optimize tagToEnum# at Core level

[GHC]

#8317: Optimize tagToEnum# at Core level
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        Reporter:  jstolarek         |            Owner:
            Type:  task              |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:  8326
        Blocking:                    |  Related Tickets:  #6135
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:62c405854afbeb6dabdaf5c737a2d7f625a2b3cb/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="62c405854afbeb6dabdaf5c737a2d7f625a2b3cb"
 Optimise (case tagToEnum# x of ..) as in Trac #8317

 See Note [Optimising tagToEnum#] in Simplify
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8317#comment:2>
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