[GHC] #9706: New block-structured heap organization for 64-bit

[GHC]

#9706: New block-structured heap organization for 64-bit
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              Reporter:  ezyang      |            Owner:  simonmar
                  Type:  task        |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Runtime     |          Version:  7.8.3
  System                             |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 Sounds plausible to me, but what is the benefit?  We seem to get
  * More complicated code (since we still need the megablocks for 32-bit)
 in exchange for... what?   I'm sure there is something, but it would be
 worth making the cost/benefit tradeoff explicit.

 Also, as 32-bit architectures wane, would there be a simpler but perhaps-
 less-performant fallback that would allow the code to be simplified for
 all architectures?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9706#comment:1>
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