[GHC] #12808: For closures, Loop Invariant Code Flow related to captured free values not lifted outside the loop...

[GHC]

#12808: For closures, Loop Invariant Code Flow related to captured free values not
lifted outside the loop...
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        Reporter:  GordonBGood       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  JoinPoints
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 lukemaurer):

 Confirmed—with join points, heap allocation drops from 23M to 70K. Looks
 like the simplifier is doing exactly what we want, and //all// the loops
 wind up as join points.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12808#comment:18>
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