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Author SHA1 Message Date
Michael Liao 74f4eaf4dc Add PRFCHW intrinsic support 
- Add head 'prfchwintrin.h' to define '_m_prefetchw' which is mapped to
  LLVM/clang prefetch builtin
- Add option '-mprfchw' to enable PRFCHW feature and pre-define '__PRFCHW__'
  macro

llvm-svn: 178041
 2013-03-26 17:52:08 +00:00