[GHC] #1687: A faster (^)-function.

[GHC]

#1687: A faster (^)-function.
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        Reporter:  moonlite@…        |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  ⊥
       Component:  Prelude           |                 Version:  6.6.1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:  x86
 Type of failure:  Runtime           |               Test Case:
  performance bug                    |
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by hvr):

 Replying to [comment:16 bgamari]:
 > hvr, what do you think about this? Perhaps integer_gmp could wrap
 `mpz_pow_ui`?

 You may notice that I had actually `mpz_pow_ui` wrapped earlier for 0.5.1,
 see

 http://hackage.haskell.org/package/integer-gmp-0.5.1.0/docs/GHC-Integer-
 GMP-Internals.html#g:3

 but I had to drop it again for `integer-gmp-1.0` because there's no easy
 way to predict how large the result will be. But I wanted to revisit this
 at some later point. It's possible to wrap `mpz_pow_ui` but it requires to
 have GMP allocate the buffer, and then copy it over into the final
 `ByteArray#`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1687#comment:17>
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