[GHC] #7782: flag to run the demand analysis a second time

[GHC]

#7782: flag to run the demand analysis a second time
-------------------------------------+-------------------------------------
        Reporter:  nfrisby           |                   Owner:
            Type:  task              |                  Status:  new
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.7
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #4941, #5302,     |                Blocking:
  #6087, #4962                       |  Differential Revisions:
-------------------------------------+-------------------------------------
Description changed by simonpj:

Old description:

> There are some tickets documenting runtime bugs that can be cleaned up by
> running the demand analyzer (followed by a simplifier run) a second time
> at the end of the pipeline: #4941, #5302, #6087. #6070 ? Others?
>
> The -flate-dmd-anal flag has been committed to HEAD (cf comment:10
> below).
>
> The remaining task is to determine if `-O2` should imply `-flate-dmd-
> anal`. It currently does not: late demand analysis is ''off'' by default.
>
> See LateDmd for more info.

New description:

 There are some tickets documenting runtime bugs that can be cleaned up by
 running the demand analyzer (followed by a simplifier run) a second time
 at the end of the pipeline: #4941, #5302, #6087, #6070. #10626 ? Others?

 The -flate-dmd-anal flag has been committed to HEAD (cf comment:10 below).

 The remaining task is to determine if `-O2` should imply `-flate-dmd-
 anal`. It currently does not: late demand analysis is ''off'' by default.

 See LateDmd for more info.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7782#comment:15>
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