[GHC] #9979: Performance regression GHC 7.8.4 to GHC HEAD

[GHC]

#9979: Performance regression GHC 7.8.4 to GHC HEAD
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        Reporter:  alanz             |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:  regression
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by hvr):

 Maybe another example to investigate is `cabal install text`, which went
 from 30 secs on GHC 7.4 to 90 secs on GHC 7.10:

 {{{
 attoparsec-0.10.4.0     GHC-7.10.0.20141227 text-1.2.0.4 # 92668ms
 attoparsec-0.10.4.0     GHC-7.8.4           text-1.2.0.4 # 65736ms
 attoparsec-0.10.4.0     GHC-7.6.3           text-1.2.0.4 # 27520ms
 attoparsec-0.10.4.0     GHC-7.4.2           text-1.2.0.4 # 31303ms
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9979#comment:2>
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