Summary: The patch includes all declarations, and also implements the following features: * ABI. * narrowing-conversion related SFIANE, including simd<> ctors and (static_)simd_cast. Reviewers: mclow.lists, EricWF Subscribers: lichray, sanjoy, MaskRay, cfe-commits Differential Revision: https://reviews.llvm.org/D41148 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@330627 91177308-0d34-0410-b5e6-96231b3b80d8