[GHC] #12032: Performance regression with large numbers of equation-style decls

[GHC]

#12032: Performance regression with large numbers of equation-style decls
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        Reporter:  tommd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 It looks like things initially regressed in 7.8, got much worse in 7.10,
 then recovered a bit in 8.0. Perhaps unsurprisingly most of the time is
 spent in renaming and typechecking on 8.0.1. Unfortunately, compile times
 are very short so it is very difficult to do reliable measurements. My
 suspicion here is that we have a constant factor regression which will be
 rather tricky to track down.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12032#comment:3>
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