[GHC] #10678: integer-gmp's runS seems unnecessarily expensive

[GHC]

#10678: integer-gmp's runS seems unnecessarily expensive
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        Reporter:  rwbarton          |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
  (CodeGen)                          |
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by simonpj):

 Good!  Can you give a small example of your last para?  I bet it's
 something like
 {{{
 case (runRW (\s -> I# x)) of (# _ , I# y) -> blah
 }}}
 I bet that you can make something similar happen with `catch#`.  A new
 ticket, perhaps.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10678#comment:7>
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