[GHC] #9740: D380 caused fft2 regressions

[GHC]

#9740: D380 caused fft2 regressions
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              Reporter:  dfeuer      |            Owner:
                  Type:  bug         |           Status:  patch
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Core        |          Version:  7.8.3
  Libraries                          |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:  Runtime     |       Blocked By:
  performance bug                    |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:  Phab:D390   |
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:"5f69c8efd94862261bc6730f8dd80c2b67b430ad/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="5f69c8efd94862261bc6730f8dd80c2b67b430ad"
 Reorder GHC.List; fix performance regressions

 Rearrange some oddly placed code.

 Modify `take` to make the fold unconditionally strict in the passed
 `Int`. This clears up the `fft2` regression.
 This fixes #9740. Differential Revision:
 https://phabricator.haskell.org/D390
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9740#comment:3>
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