[GHC] #11372: Loopification does not trigger for IO even if it could

[GHC]

#11372: Loopification does not trigger for IO even if it could
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        Reporter:  jscholl           |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
  (CodeGen)                          |             Keywords:  cmm,
      Resolution:  fixed             |  loopification, code generation
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1767
       Wiki Page:                    |
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Comment (by thomie):

 [https://perf.haskell.org/ghc/#revision/4d51bfc8975f9c6c3ab6d293c48f98da85210d5f
 GHC Speed] results are in:
 {{{
 nofib/time/fannkuch-redux       3.153   - 11.45%        2.792   seconds
 nofib/time/n-body               0.886   - 3.61%         0.854   seconds
 }}}

 Nice!

 Also interesting is the stabilization of the n-body performance in this
 [https://perf.haskell.org/ghc/#graph/nofib/time/n-body;hl=4d51bfc8975f9c6c3ab6d293c48f98da85210d5f
 graph].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11372#comment:8>
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