[GHC] #10397: Compiler performance regression 7.6 -> 7.8 in elimCommonBlocks

[GHC]

#10397: Compiler performance regression 7.6 -> 7.8 in elimCommonBlocks
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        Reporter:  TobyGoodwin       |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  7.10.2
       Component:  Compiler          |              Version:  7.8.4
      Resolution:  fixed             |             Keywords:  performance
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  see ticket
      Blocked By:                    |             Blocking:
 Related Tickets:  #14226            |  Differential Rev(s):  Phab:D892
       Wiki Page:                    |  Phab:D896
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Comment (by simonpj):

 > severely reduces our ability to CBE

 Do you mean: it makes un-equal blocks that should be considered equal?
 Can you give an example?  (For truly un-equal blocks we ''want'' to
 restrict our CBE: they aren't equal!)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10397#comment:40>
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