[GHC] #9233: Compiler performance regression

[GHC]

#9233: Compiler performance regression
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        Reporter:  augustss      |            Owner:
            Type:  bug           |           Status:  new
        Priority:  low           |        Milestone:
       Component:  Compiler      |          Version:  7.8.2
      Resolution:                |         Keywords:
Operating System:  Windows       |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |       Difficulty:  Unknown
       Test Case:                |       Blocked By:
        Blocking:                |  Related Tickets:
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Comment (by augustss):

 I turned off SpecConstr and the compile times remained pretty much the
 same.  Total compile time with ghc-7.6 is 5041s and with ghc-7.8 it is
 6963s, so 38% longer.  This is compiling 853 modules, out of which 5
 modules compiled faster with the new ghc and the rest are slower, some
 taking almost 3 times as long.

 I will see if I can isolate one of these module and include in this bug
 report.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9233#comment:7>
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