[GHC] #13227: Loss of full laziness in mapFB

[GHC]

#13227: Loss of full laziness in mapFB
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3067
       Wiki Page:                    |
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Changes (by nomeata):

 * status:  patch => new
 * owner:  nomeata =>


Comment:

 > According to perf.haskell.org (which does run nofib!), the only
 significant changes are time improvements of 3.5% for cacheprof and
 k-nucleotid.

 Indeed, these improvements (with -2.7% resp. -4.16% for the final commit)
 seem to be genuine, and not just flaky measurements. :-)

 > Will you pursue comment:9?

 Will give it a shot.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13227#comment:12>
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