[GHC] #8345: A more efficient atomicModifyIORef'

[GHC]

#8345: A more efficient atomicModifyIORef'
-------------------------------------+-------------------------------------
        Reporter:  parcs             |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  7.10.1
       Component:  libraries/base    |          Version:  7.6.3
      Resolution:                    |         Keywords:  IORef
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  Runtime           |       Difficulty:  Moderate (less
  performance bug                    |  than a day)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #5926
-------------------------------------+-------------------------------------

Comment (by carter):

 huh,  i'll try to find some cycles to think about the semantics of this

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8345#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler