[GHC] #634: Implement a more efficient TArray

[GHC]

#634: Implement a more efficient TArray
--------------------------+-------------------------------------------------
    Reporter:  anonymous  |        Owner:                    
        Type:  task       |       Status:  new               
    Priority:  normal     |    Milestone:                    
   Component:  Compiler   |      Version:  6.4.1             
    Severity:  normal     |     Keywords:                    
          Os:  Unknown    |   Difficulty:  Difficult (1 week)
Architecture:  Unknown    |  
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{{{Control.Concurrent.STM.TArray}}} is implemented as an immutable array
 of TVars.  This gives good parallelism, but isn't very efficient if you
 don't need that parallelism.

 See: [http://www.haskell.org//pipermail/haskell-cafe/2005-
 December/012909.html]

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Ticket URL: <http://cvs.haskell.org/trac/ghc/ticket/634>
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