[GHC] #16040: Unboxing-Related Performance Issue with Polymorphic Functions

[GHC]

#16040: Unboxing-Related Performance Issue with Polymorphic Functions
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        Reporter:  _recursion        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.2
      Resolution:                    |             Keywords:
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 _recursion):

 A cursory read looks like it would, yes!

 Nevertheless, this is pretty concerning. I now have no idea why most of
 our codebase isn't getting hit by this issue, and suddenly I've run into a
 place where it occurs. I'm a little afraid for the performance stability
 of our code across GHC upgrades now.

 Is it something that could only be fixed by nested CPR or could a band-aid
 fix be put in place, do you think?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16040#comment:4>
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