[GHC] #14062: Pure syntax transformation affects performance.

[GHC]

#14062: Pure syntax transformation affects performance.
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        Reporter:  danilo2           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by George):

 I can't reproduce with 8.6.1 either:

 {{{
 benchmarking monad transformers overhead/test1
 time                 94.84 ms   (91.89 ms .. 97.81 ms)
                      0.998 R²   (0.993 R² .. 1.000 R²)
 mean                 97.52 ms   (95.91 ms .. 100.6 ms)
 std dev              3.344 ms   (1.380 ms .. 4.705 ms)

 benchmarking monad transformers overhead/test2
 time                 95.69 ms   (94.49 ms .. 98.26 ms)
                      0.999 R²   (0.996 R² .. 1.000 R²)
 mean                 95.81 ms   (95.24 ms .. 97.28 ms)
 std dev              1.375 ms   (323.2 μs .. 2.151 ms)

 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14062#comment:5>
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