[GHC] #5210: Add primops for copying/cloning byte arrays

[GHC]

#5210: Add primops for copying/cloning byte arrays
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    Reporter:  tibbe             |        Owner:  dterei      
        Type:  feature request   |       Status:  patch       
    Priority:  high              |    Milestone:  7.2.1       
   Component:  Compiler          |      Version:  7.0.3       
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by dterei):

 No I understand the general idea going on in the backend with live vars
 and all, I'm just not completely convinced this is the way it should be
 handled. With these patches where you are just making one C function call,
 src and co aren't really live across the call. Well they might be but the
 assignTemp stuff to save them is local to our scope so it will only save
 them for this code where they are only used for one C call so why are we
 saving them? I'm rusty on this stuff so maybe I'm completely off here.
 I'll apply the patches now as my only concern is that we may be doing more
 work, not that the code is wrong.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5210#comment:12>
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