[GHC] #8033: add AVX register support to llvm calling convention

[GHC]

#8033: add AVX register support to llvm calling convention
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        Reporter:  carter            |            Owner:  carter
            Type:  task              |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by carter):

 @gmainland, is the sse2 test always true on x86_64?  Thats my concern,
 that -msse on x86_64 will be "wrong" with GHC head now that we have SIMD
 support. Unless LLVM does the right instruction lowering / register
 transfers when trying to use sse2 when set to -msse

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8033#comment:24>
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