[GHC] #9655: Do not UNPACK strict fields that are very wide

[GHC]

#9655: Do not UNPACK strict fields that are very wide
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              Reporter:  simonpj     |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by tibbe):

 > should GHC auto-unpack a strict argument of a data constructor, if the
 argument type is a very wide product type?

 I'm confused. I don't think GHC does unpack strict fields unless either 1)
 it's of pointer size or 2) you use `-funbox-strict-fields` or 3) you use
 `UNPACK`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9655#comment:2>
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