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

[GHC]

#1600: Optimisation: CPR the results of IO
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        Reporter:  simonmar          |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  lowest            |            Milestone:
       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 Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 What is the status of this, akio?

 > I wonder if this improvement justifies the added complexity to the
 compiler (about 400 lines of code added under `compiler/`). Right now I
 don't see any way to make the analysis/transformation more effective.

 Well, 2.6% improvement in runtime is quite sizeable. This sounds quite
 worthwhile to me. Good work!

 Simon, do you agree?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1600#comment:74>
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