[GHC] #7602: Threaded RTS performing badly on recent OS X (10.8?)

[GHC]

#7602: Threaded RTS performing badly on recent OS X (10.8?)
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        Reporter:  simonmar          |            Owner:  thoughtpolice
            Type:  bug               |           Status:  new
        Priority:  highest           |        Milestone:  7.8.3
       Component:  Runtime System    |          Version:
      Resolution:                    |         Keywords:  thread-local
Operating System:  MacOS X           |  state, TLS clang
 Type of failure:  Runtime           |     Architecture:  x86_64 (amd64)
  performance bug                    |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:  7678
        Blocking:                    |  Related Tickets:
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Comment (by carter):

 there was some recent chatter on the llvm list about adding gcc style
 global named register support to clang
 https://groups.google.com/forum/#!msg/llvm-dev/p7GAE_bbDoo/QgJme5LblBkJ
 and
 http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-March/071503.html

 perhaps someone on the ghc team should chime in :)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7602#comment:40>
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