[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 simonpj):

 I can't reproduce this. I didn't use Criterion; I just ran the programs.
 Both produced the same code with ghc-8.0 and HEAD, and both ran equally
 fast.

 Interestingly, HEAD ran them 25% faster than 8.0.  The Core looks the
 same, so I don't know where that improvement comes from, but I'm sure
 it'll make you happy.

 Can anyone else reproduce this?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14062#comment:2>
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