[GHC] #10521: Wrong results in strict Word8 storage on x64

[GHC]

#10521: Wrong results in strict Word8 storage on x64
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        Reporter:  VincentBerthoux2  |                   Owner:  rwbarton
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by rwbarton):

 * owner:   => rwbarton


Comment:

 In fact I did try just changing GlobalReg's Eq instance (and Ord instance)
 to treat `FloatReg i` and `DoubleReg i` as the same, and that did fix this
 issue. Doing this properly will require a bit more refactoring than that,
 since whether these registers overlap depends on the DynFlags, but it
 looks like it will be nothing too serious.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10521#comment:8>
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