[GHC] #8834: 64-bit windows cabal.exe segfaults in GC

[GHC]

#8834: 64-bit windows cabal.exe segfaults in GC
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        Reporter:  awson          |            Owner:  jstolarek
            Type:  bug            |           Status:  patch
        Priority:  highest        |        Milestone:  7.8.1
       Component:  Compiler       |          Version:  7.8.1-rc2
      Resolution:                 |         Keywords:
Operating System:  Windows        |     Architecture:  x86_64 (amd64)
 Type of failure:  Runtime crash  |       Difficulty:  Unknown
       Test Case:                 |       Blocked By:
        Blocking:                 |  Related Tickets:
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Comment (by simonmar):

 I believe `mingw32_HOST_OS` is defined on 64-bit Windows.  The full
 platform name is `x86_64-unknown-mingw32`, i.e. `mingw32` is the OS.

 You can test this with `ghc --info` on your 64-bit Windows GHC.

 If `memchr` is clobbering allegedly callee-saves registers, then either
 `memchr` is wrong, or our idea of what is callee-saves is wrong.  Which is
 it?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8834#comment:58>
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