[GHC] #8345: A more efficient atomicModifyIORef'

[GHC]

#8345: A more efficient atomicModifyIORef'
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        Reporter:  parcs             |            Owner:
            Type:  task              |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  libraries/base    |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Changes (by simonmar):

 * cc: hvr (added)


Comment:

 It looks plausible, but before committing someone should check that it
 doesn't regress any of the issues that the original version was designed
 to avoid, see #5926.  Ideally we should have tests for these.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8345#comment:1>
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