[GHC] #12736: Calling a complex Haskell function (obtained via FFI wrapper function) from MSVC 64-bit C code (passed in as FunPtr) can leave SSE2 registers in the XMM6-XMM15 range modified

[GHC]

#12736: Calling a complex Haskell function (obtained via FFI wrapper function) from
MSVC 64-bit C code (passed in as FunPtr) can leave SSE2 registers in the
XMM6-XMM15 range modified
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        Reporter:  bavism            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (FFI)    |              Version:  7.10.3
      Resolution:                    |             Keywords:
                                     |  ffi,registers,sse2,clobber,xmm
Operating System:  Windows           |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  Incorrect result  |            Test Case:
  at runtime                         |  https://github.com/bavis-m/raycast
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by carter):

 To clarify: you could also compile your c code to assume it's in an
 avx/avx2 microarchtiecture to see if that works.  But if you wanna support
 sse2 targets a teeny bit of xmm read write code might help

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12736#comment:2>
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