[GHC] #9350: Consider using xchg instead of mfence for CS stores

[GHC]

#9350: Consider using xchg instead of mfence for CS stores
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              Reporter:  tibbe       |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.9
             Component:  Compiler    |         Keywords:
  (NCG)                              |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Easy (less than 1
      Operating System:              |  hour)
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  Runtime     |  Related Tickets:
  performance bug                    |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Changes (by thomie):

 * cc: simonmar (added)
 * failure:  None/Unknown => Runtime performance bug
 * component:  Compiler => Compiler (NCG)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9350#comment:3>
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