[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 Joachim Breitner <mail@…>):

 In [changeset:"eca86485cdd8441bf50f34133553b630a2baa7f3/ghc" eca8648/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="eca86485cdd8441bf50f34133553b630a2baa7f3"
 GHC.Base: Use thenIO in instance Applicative IO

 Since recent changes to CSE, the previous definition were no longer CSEd
 with thenIO, which resulted in extra steps in the simplifier and hence
 slightly larger compile times. See ticket:11781#comment:7.

 Differential Revision: https://phabricator.haskell.org/D2092
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11781#comment:14>
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