[GHC] #7866: floor (0/0) :: Int is different with -O0 and -O1

[GHC]

#7866: floor (0/0) :: Int is different with -O0 and -O1
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        Reporter:  alang9                       |            Owner:
            Type:  bug                          |           Status:  closed
        Priority:  normal                       |        Milestone:
       Component:  Compiler                     |          Version:  7.6.2
      Resolution:  invalid                      |         Keywords:
Operating System:  Linux                        |     Architecture:  x86_64
 Type of failure:  Incorrect result at runtime  |  (amd64)
       Test Case:                               |       Difficulty:
        Blocking:                               |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Comment (by bgamari):

 According the IEEE754-1985, Section 7.1 (as I don't have access to the
 latest version of the standard) attempting to convert an unrepresentable
 floating point value like should result in an invalid operation exception.
 The specification states that when there is no trap, the result should be
 NaN when floating point. The specification makes no statement on what
 should happen when there is no trap and the destination format is unable
 to represent NaN.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7866#comment:5>
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