[GHC] #8323: explore ways to possibly use more tag bits in x86_64 pointers

[GHC]

#8323: explore ways to possibly use more tag bits in x86_64 pointers
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              Reporter:  carter      |            Owner:
                  Type:  task        |           Status:  infoneeded
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.7
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  x86_64 (amd64)
  Unknown/Multiple                   |       Difficulty:  Project (more
       Type of failure:              |  than a week)
  None/Unknown                       |       Blocked By:
             Test Case:              |  Related Tickets:
              Blocking:              |
Differential Revisions:              |
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Changes (by thomie):

 * status:  new => infoneeded


Comment:

 Could you expand the description a bit. What are the possible use cases of
 those extra bits?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8323#comment:2>
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