[GHC] #13588: Simplify StgCase when all alternatives are the case binder

[GHC]

#13588: Simplify StgCase when all alternatives are the case binder
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           Reporter:  nomeata        |             Owner:  (none)
               Type:  task           |            Status:  new
           Priority:  low            |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Nudged by rwbarton, simponpj writes in ticket:13536#comment:16:

 Yes. It's really

 {{{
       case e of w { p1 -> w; ...; pn -> w }
 ===>
       e
 }}}
 (Core has a more general version involving strictness on x.)

 I don't know how much it happens in practice. It would not be hard to
 include this in StgCse though.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13588>
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