[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 simonpj):

 >  Regarding fixing this or CPR, would nested CPR fix all cases 'like
 this', as you put it, or even if the nested CPR patch lands would there
 still be a need for functionality to catch cases like this?

 I think we want ''both'' nested CPR ''and'' better placement of heap
 checks.  They do different things -- it just so happens that in this case
 either would solve it.

 Great that you can work on it.  I'd suggest the heap-check placement one,
 because it's a well-contained problem, I think.  Nested CPR may have a
 longer on-ramp.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16040#comment:7>
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