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7922d3e39a
important bits of cleverness: to detect and lower repeated shuffle patterns between the two 128-bit lanes with a single instruction. This patch just teaches it how to lower single-input shuffles that fit this model using VPERMILPS. =] There is more that needs to happen here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218211 91177308-0d34-0410-b5e6-96231b3b80d8