[GHC] #10049: Lower level memcpy primop

[GHC]

#10049: Lower level memcpy primop
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        Reporter:  chadaustin        |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by tibbe):

 That's indeed the only one we're missing. We have e.g.
 `copyAddrToByteArray#`. There's a separate ticket (and Phab entry) for the
 rep movsw. Austin was working on that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10049#comment:1>
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