[GHC] #11781: Improve common sub-expression

[GHC]

#11781: Improve common sub-expression
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2074
       Wiki Page:                    |
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Comment (by simonpj):

 For the record, the actual commit was
 {{{
 commit 5b986a4de288e2c703c38ee37222a7bf3260cc11
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Fri Apr 1 12:24:50 2016 +0200

     CSE code cleanup and improvement

     Triggered by an observation by Joachim, Simon felt the urge to clean
 up
     the CSE code a bit. This is the result.

     (Code by Simon, commit message and other leg-work by Joachim)

     Differential Revision: https://phabricator.haskell.org/D2074
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11781#comment:15>
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