[GHC] #8107: need types to express constant argument for primop correctness

[GHC]

#8107: need types to express constant argument  for primop correctness
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        Reporter:  carter            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by carter):

 a better example motivating "reallyactually compile time constants" is
 supporting the various SIMD vector shuffling operations, i'll cook up an
 exposition of that if anyone would like  that explained more

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8107#comment:4>
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