[GHC] #13027: The let/app invariant, evaluated-ness, and reallyUnsafePtrEquality#

[GHC]

#13027: The let/app invariant, evaluated-ness, and reallyUnsafePtrEquality#
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Building GHC      |            Test Case:
  failed                             |  simplCore/should_compile/T13027
      Blocked By:                    |             Blocking:
 Related Tickets:  #11444            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"6b976eb89fe72827f226506d16d3721ba4e28bab/ghc"
 6b976eb8/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6b976eb89fe72827f226506d16d3721ba4e28bab"
 Record evaluated-ness on workers and wrappers

 In Trac #13027, comment:20, I noticed that wrappers created after
 demand analysis weren't recording the evaluated-ness of strict
 constructor arguments.  In the ticket that led to a (debatable)
 Lint error but in general the more we know about evaluated-ness
 the better we can optimise.

 This commit adds that info both in the worker (on args) and in
 the wrapper (on CPR result patterns).

 See Note [Record evaluated-ness in worker/wrapper] in WwLib

 On the way I defined Id.setCaseBndrEvald, and used it to shorten
 the code in a few other places
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13027#comment:28>
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