[GHC] #12095: GHC and LLVM don't agree on what to do with byteSwap16#

[GHC]

#12095: GHC and LLVM don't agree on what to do with byteSwap16#
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        Reporter:  thoughtpolice     |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.2
       Component:  Compiler (LLVM)   |              Version:  8.0.1
      Resolution:                    |             Keywords:  codegen, llvm
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 `byteSwap16#` is defined in `primops.txt.pp` as
 {{{
 primop   BSwap16Op   "byteSwap16#"   Monadic   Word# -> Word#
     {Swap bytes in the lower 16 bits of a word. The higher bytes are
 undefined. }
 }}}
 So, I don't see the problem. Writing `W64# (byteSwap16# (...))` is wrong.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12095#comment:1>
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