[GHC] #9434: GHC.List.reverse does not fuse

[GHC]

#9434: GHC.List.reverse does not fuse
-------------------------------------+-------------------------------------
              Reporter:  dfeuer      |            Owner:
                  Type:  bug         |           Status:  patch
              Priority:  normal      |        Milestone:
             Component:              |          Version:  7.9
  libraries/base                     |         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:              |
-------------------------------------+-------------------------------------
Changes (by dfeuer):

 * status:  new => patch


Comment:

 The nofib results look generally good, if I'm reading them right. It
 appears that with regard to allocations, the biggest benefits are to kahan
 (-7.8%), gamteb (-4.1%), and scs (-1.4%). The loser, for some reason,
 seems to be constraints (+3.6%). I don't have much faith in my (good-
 looking) timing measurements—the results look ... very wonky. I'm hoping
 maybe someone who's better at such things can try to measure those
 properly.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9434#comment:3>
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