[GHC] #14208: Performance with -O2 is worse than with -O0 which is worse than runghc

[GHC]

#14208: Performance with -O2 is worse than with -O0 which is worse than runghc
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        Reporter:  harendra          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by harendra):

 I added a branch named `does-not-occur` in the repo with a simpler case
 where the problem does not occur even when the code is split across
 modules.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14208#comment:1>
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