[GHC] #9435: x86 sse4.2 popCnt16# needs to zero-extend its result

[GHC]

#9435: x86 sse4.2 popCnt16# needs to zero-extend its result
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              Reporter:  rwbarton    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.9
  (NCG)                              |         Keywords:
            Resolution:              |     Architecture:  x86_64 (amd64)
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  Incorrect   |  Related Tickets:
  result at runtime                  |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by rwbarton):

 `popCnt8#` is affected too, but (possibly by luck, possibly not) we reuse
 the source register as the destination register and we needed to zero-
 extend the source anyways as there is no 8-bit `popcnt` instruction.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9435#comment:1>
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