[GHC] #13633: testwsdeque failure on POWER8

[GHC]

#13633: testwsdeque failure on POWER8
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        Reporter:  trommler        |                Owner:  (none)
            Type:  bug             |               Status:  new
        Priority:  normal          |            Milestone:
       Component:  Runtime System  |              Version:  8.1
      Resolution:                  |             Keywords:  SMP
Operating System:  Linux           |         Architecture:  powerpc64
 Type of failure:  Runtime crash   |            Test Case:  rts/testwsdeque
      Blocked By:                  |             Blocking:
 Related Tickets:                  |  Differential Rev(s):
       Wiki Page:                  |
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Comment (by trommler):

 Replying to [comment:1 simonmar]:
 > This is bad and suggests that either we're using the wrong barriers in
 the implementation, or the implementation of the barriers is wrong for
 POWER8.
 I looked at the implementation of the barriers and `cas()` in `SMP.h`again
 and they are correct for POWER and PowerPC.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13633#comment:2>
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