[GHC] #14980: Runtime performance regression with binary operations on vectors

[GHC]

#14980: Runtime performance regression with binary operations on vectors
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        Reporter:  ttylec            |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:  vector
                                     |  bitwise operations
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 If the badness is only for a particular stack LTS, I wonder if the badness
 will go away in the next stack LTS and we can declare this ticket moot?

 I'd suggest the next thing to investigate: do a profiled build and see
 where the factor of 100 is going.  It's such a huge change it should be
 blindingly obvious :-).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14980#comment:13>
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