[GHC] #14519: Exponential runtime performance regression in GHC 8.2 + Data.Text.Lazy + Text.RE.TDFA

[GHC]

#14519: Exponential runtime performance regression in GHC 8.2 + Data.Text.Lazy +
Text.RE.TDFA
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        Reporter:  ntc2              |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime           |            Test Case:
  performance bug                    |  https://github.com/ntc2/ghc-8.2.1
                                     |  -regex-lazy-text-bug
      Blocked By:                    |             Blocking:
 Related Tickets:  13745             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ntc2):

 As suggested by @nomeata, I'm going to try bisecting GHC between 8.0.2 and
 8.2.0 to discover when the performance regression was introduced.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14519#comment:1>
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