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8e93ce1780
AVX-512. There is no interesting logic yet. Everything ends up eventually delegating to the generic code to split the vector and shuffle the halves. Interestingly, that logic does a significantly better job of lowering all of these types than the generic vector expansion code does. Mostly, it lets most of the cases fall back to nice AVX2 code rather than all the way back to SSE code paths. Step 2 of basic AVX-512 support in the new vector shuffle lowering. Next up will be to incrementally add direct support for the basic instruction set to each type (adding tests first). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218585 91177308-0d34-0410-b5e6-96231b3b80d8