[GHC] #11795: Performance issues with replicateM_

[GHC]

#11795: Performance issues with replicateM_
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        Reporter:  snoyberg          |                Owner:  snoyberg
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  Runtime           |  (amd64)
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Michael, this is (sadly) a well known issue.  #1168 has a list of related
 tickets, and #9388 has ideas and preliminary work on how to limit the
 scope of the hack.

 I think it'd be fine to switch implementations of `replicateM_`, but can
 you put a prominent notice on the master ticket #1168 so that whoever
 looks into it doesn't think "oh the problem has gone away".  Your fix will
 (helpfully) cure the symptom but not the disease.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11795#comment:2>
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