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* Add PRFCHW intrinsic supportMichael Liao2013-03-261-0/+12
- 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
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