[GHC] #13569: Optimise code-gen for field-updates of large products

[GHC]

#13569: Optimise code-gen for field-updates of large products
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        Reporter:  hvr               |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
  (CodeGen)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Even our NCG (at least on X86, I haven't checked the others) will unroll
 small `memcpy`s, so I think this should always be a sensible thing to do.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13569#comment:8>
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