[GHC] #1600: Optimisation: CPR the results of IO

[GHC]

#1600: Optimisation: CPR the results of IO
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        Reporter:  simonmar          |                   Owner:
            Type:  task              |                  Status:  new
        Priority:  lowest            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  6.6.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #8598             |  Differential Revisions:
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Comment (by akio):

 Replying to [comment:43 nomeata]:
 > I think the conclusion was that Nested CPR was not worth it. The branch
 is still there if someone wants to pick it up. Unassigning.
 Why is it not worth it?

 If there is a chance that the branch can be improved to the point that it
 can be merged, I'm interested in trying. The lack of nested CPR has been
 the most frequent reason that I have to use unboxed types manually.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1600#comment:46>
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