[GHC] #3586: Slow array code

[GHC]

#3586: Slow array code
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    Reporter:  simonpj                   |        Owner:                  
        Type:  run-time performance bug  |       Status:  new             
    Priority:  normal                    |    Milestone:                  
   Component:  Compiler                  |      Version:  6.10.4          
    Severity:  normal                    |   Resolution:                  
    Keywords:                            |   Difficulty:  Unknown         
    Testcase:                            |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple          |  
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Comment (by int-e):

 Addendum: The code generated for forM_ [0..n-1] ... is just as fast as a
 hand-written loop in my tests, if compiled with optimisations enabled.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3586#comment:7>
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