[GHC] #4101: Primitive constant unfolding

[GHC]

#4101: Primitive constant unfolding
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        Reporter:  malosh                   |            Owner:  schyler
            Type:  bug                      |           Status:  new
        Priority:  low                      |        Milestone:  7.6.2
       Component:  Compiler                 |          Version:  6.12.2
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:  x86
 Type of failure:  Runtime performance bug  |       Difficulty:  Unknown
       Test Case:                           |       Blocked By:
        Blocking:                           |  Related Tickets:
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Comment (by carter):

 So one thing that also maybe needs to be done is add proper way of
 tracking NAN and other exception values (and coding them correctly too) as
 a prereq for constant evaluation

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4101#comment:14>
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