[GHC] #13220: Performance regressions in testsuite from join points

[GHC]

#13220: Performance regressions in testsuite from join points
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        Reporter:  lukemaurer        |                Owner:  lukemaurer
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  JoinPoints
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):

 When GHC takes longer to compile the same file, it's sometime because it's
 generated bigger code.  What does `-dshow-passes` show `ghc-before` and
 `ghc-after` compiling the same `DynFlags.hs`?

 `DynFlags` is a jolly big file.  Are there smaller modules that show a big
 compile-time difference.  `nofib-analyse` shows some per-module info I
 think.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13220#comment:16>
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