[GHC] #9136: Constant folding in Core could be better

[GHC]

#9136: Constant folding in Core could be better
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              Reporter:  simonpj     |            Owner:  nomeata
                  Type:  bug         |           Status:  infoneeded
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.2
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Runtime     |       Blocked By:
  performance bug                    |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by nomeata):

 > @Joachim: is this patchset still in limbo? If there's no measurable
 performance impact, but it improves code and doesn't hurt performance, I
 don't see why you cannot merge it.

 Compiler code complexity would be one reason to not merge it. Other than
 that I mostly forgot about this... and so I’m not sure about the
 completeness of my work (and it needs more comments, as always). I’ll
 eventually return to it, but without high priority. Just leave it assigned
 to me.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9136#comment:18>
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