[GHC] #8048: Register spilling produces ineffecient/highly contending code

[GHC]

#8048: Register spilling produces ineffecient/highly contending code
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        Reporter:  schyler           |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  _|_
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:  register
Operating System:  Unknown/Multiple  |  allocator spill
 Type of failure:  Runtime           |     Architecture:  Unknown/Multiple
  performance bug                    |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by schyler):

 Using a pretty crude benchmark, found a 9-10% hit.
 https://gist.github.com/kvanberendonck/6836713
 It's hard to benchmark something so small though - those of you with Intel
 processors might have less luck running this one, but AMD is a little more
 linear and gives quite stable results.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8048#comment:8>
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