[GHC] #7450: Regression in optimisation time of functions with many patterns (6.12 to 7.4)?

[GHC]

#7450: Regression in optimisation time of functions with many patterns (6.12 to
7.4)?
-------------------------------------+-------------------------------------
        Reporter:  iustin            |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.6.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1012
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"b1726c1194f1ed35dffc83304260b3b29abd0c53/ghc"
 b1726c11/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b1726c1194f1ed35dffc83304260b3b29abd0c53"
 Bitmap: Use foldl' instead of foldr

 These are producing StgWords so foldl' is the natural choice. I'm not
 sure how I didn't notice this when I wrote D1041.

 Test Plan: Validate

 Reviewers: austin, simonmar

 Reviewed By: simonmar

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2955

 GHC Trac Issues: #7450
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7450#comment:34>
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