[GHC] #16036: expDouble## 0.0## doesn't get complied into 1.0##

[GHC]

#16036: expDouble## 0.0## doesn't get complied into 1.0##
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        Reporter:  Fuuzetsu          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by carter):

 For  exp 0, on float or double, I believe the answe is always 1.  Exactly.
 Note that this is ignoring negative zero.  I believe that exp of negative
 infinity should always be positive zero.  But  I’ll need to think about it

 However, i believe that for any other constants the exact answer may
 depend on the rounding mode at the time of execution.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16036#comment:3>
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