[GHC] #8955: Syscall intrinsic

[GHC]

#8955: Syscall intrinsic
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        Reporter:  schyler           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hsyl20):

 As mentioned in the blog post (I'm the author), on x86-64 we can even use
 foreign primops to avoid the "call" indirection.

 https://github.com/hsyl20/ViperVM/blob/master/src/lib/ViperVM/Arch/X86_64/Linux/Syscall.hs#L27

 https://github.com/hsyl20/ViperVM/blob/master/src/lib/ViperVM/Arch/X86_64/Linux/syscall.c#L95

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8955#comment:4>
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