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This was currently part of lowering to PALIGNR with some special-casing to make interlane shifting work. Since AVX512F has interlane alignr (valignd/q) and AVX512BW has vpalignr we need to support both of these *at the same time*, e.g. for SKX. This patch breaks out the common code and then add support to check both of these lowering options from LowerVECTOR_SHUFFLE. I also added some FIXMEs where I think the AVX512BW and AVX512VL additions should probably go. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214888 91177308-0d34-0410-b5e6-96231b3b80d8
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