[GHC] #9736: Constant folding rules are wrong for GHCJS

[GHC]

#9736: Constant folding rules are wrong for GHCJS
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              Reporter:  luite       |            Owner:  luite
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:  7.10.1
             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 simonpj):

 Can you be more specific?  Why are these "optimisations" wrong for GHCJS?
 Could they be wrong for other architectures?  Concretely, what change do
 you propose?

 Built-in rules (like those in `PrelRules` have access to `DynFlags`.  If
 necessary you could make the rule conditional on the `GHCJS` flag
 (whatever that is).

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9736#comment:1>
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