[GHC] #9315: Weird change in allocation numbers of T9203

[GHC]

#9315: Weird change in allocation numbers of T9203
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              Reporter:  nomeata     |             Owner:  simonmar
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Runtime     |           Version:  7.9
  System                             |          Keywords:
            Resolution:              |  Operating System:  Unknown/Multiple
Differential Revisions:              |   Type of failure:  None/Unknown
          Architecture:              |         Test Case:
  Unknown/Multiple                   |          Blocking:
            Difficulty:  Unknown     |
            Blocked By:              |
       Related Tickets:              |
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Comment (by simonpj):

 As well as your last para, you seem to have found that compiling some
 particular module (is it `Data.Typeable.Internal`?) with -O2 instance of
 -O1 makes a factor of 2 difference in allocation for at least this test.
 Is that right?  If so, it'd be worth knowing why, and perhaps putting `{-#
 OPTIONS_GHC -O2 #-}` with a clear comment in that file.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9315#comment:6>
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