[GHC] #7977: Optimization: Shift dropped list heads by coeffecient to prevent thunk generation

[GHC]

#7977: Optimization: Shift dropped list heads by coeffecient to prevent thunk
generation
-------------------------------------+-------------------------------------
              Reporter:  schyler     |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:  ⊥
              Priority:  low         |          Version:  7.4.2
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Difficult (2-5
  Unknown/Multiple                   |  days)
       Type of failure:  Runtime     |       Blocked By:
  performance bug                    |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * failure:  None/Unknown => Runtime performance bug


Comment:

 Not technically a "Runtime performance bug", but easier to find this way.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7977#comment:4>
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