[GHC] #8668: SPECIALIZE silently fails to apply

[GHC]

#8668: SPECIALIZE silently fails to apply
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        Reporter:  crockeea          |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by crockeea):

 For the small example above, GHC simply inlines everything and both main
 functions are equally fast.

 However, I tried this in my real code and the equivalent of plusFastCyc is
 too large for GHC to inline (even with `INLINE` pragmas), and used in too
 many places for that to be a good solution even if it did work. That's why
 I'm trying to make GHC call a specialized function instead.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8668#comment:9>
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