[GHC] #8726: integer-gmp division regression

[GHC]

#8726: integer-gmp division regression
------------------------------------------------+--------------------------
        Reporter:  erikd                        |            Owner:  hvr
            Type:  bug                          |           Status:  new
        Priority:  highest                      |        Milestone:  7.8.1
       Component:  libraries (other)            |          Version:
      Resolution:                               |  7.8.1-rc1
Operating System:  Unknown/Multiple             |         Keywords:
 Type of failure:  Incorrect result at runtime  |  Integer-gmp
       Test Case:                               |     Architecture:
        Blocking:                               |  Unknown/Multiple
                                                |       Difficulty:
                                                |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
------------------------------------------------+--------------------------

Comment (by erikd):

 Related problems with divMod. ghc-7.6.3:


 {{{
 Prelude> divMod 0x10000000000000001 (-0x100000)
 (-17592186044417,-1048575)
 Prelude> divMod 0x10000000001 (-0x100000)
 (-1048577,-1048575)
 }}}

 ghc-7.6:

 {{{
 Prelude> divMod 0x10000000000000001 (-0x100000)
 (17592186044417,1048575)
 Prelude> divMod 0x10000000001 (-0x100000)
 (-1048577,-1048575)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8726#comment:2>
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