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Similar to the existing code to lower to PACKSS, we can use PACKUS if the input vector's leading zero bits extend all the way to the packed/truncated value. We have to account for pre-SSE41 targets not supporting PACKUSDW git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317128 91177308-0d34-0410-b5e6-96231b3b80d8
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