[GHC] #5924: Bad Cmm generated for updating one element in Array#

[GHC]

#5924: Bad Cmm generated for updating one element in Array#
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    Reporter:  tibbe             |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:  7.6.1           
   Component:  Compiler          |     Version:  7.4.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Changes (by simonmar):

  * difficulty:  => Unknown
  * milestone:  => 7.6.1


Comment:

 I think the `memset` can be omitted; we don't care about the card table
 when the array is in the young generation.  The assignments you've marked
 as XXX will probably be removed by the coalescing optimisation in the
 register allocator - you might want to check the assembly.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5924#comment:3>
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