[GHC] #9238: Negative zero broken

[GHC]

#9238: Negative zero broken
------------------------------------------------+--------------------------
        Reporter:  augustss                     |            Owner:
            Type:  bug                          |           Status:  new
        Priority:  normal                       |        Milestone:
       Component:  Compiler                     |          Version:  7.8.2
      Resolution:                               |         Keywords:
Operating System:  Unknown/Multiple             |     Architecture:
 Type of failure:  Incorrect result at runtime  |  Unknown/Multiple
       Test Case:                               |       Difficulty:
        Blocking:                               |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Comment (by carter):

 I can reproduce the behavior on ghc 7.8.2 on OS X 64 bit

 i've also started taking a look at the core generated for the 3
 alternatives lennart laid out, using variations of the following ghc
 invocation
 {{{
 ghc -O1 -ddump-simpl -dsuppress-idinfo -dsuppress-coercions -dsuppress-
 type-applications -dsuppress-uniques -dsuppress-module-prefixes bugMain.hs
 > bugO1CoreNOINLINE.simple
 }}}


 though i'm still working through which differences are real and which
 arent

 https://gist.github.com/cartazio/351f15ae74257a7ab64d

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9238#comment:4>
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