[GHC] #11668: SPEC has a runtime cost if constructor specialization isn't performed (was: SPEC has a runtime cost)

[GHC]

#11668: SPEC has a runtime cost if constructor specialization isn't performed
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        Reporter:  bgamari           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 It seems that SPEC is correctly eliminated if `-fspec-constr` is used so
 this should only be a problem for code expecting constructor
 specialization that gets compiled with `-O1`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11668#comment:1>
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