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6ef31b0079
UNPCKHPS with AVX vectors by recognizing those patterns when they are repeated for both 128-bit lanes. With this, we now generate the exact same (really nice) code for Quentin's avx_test_case.ll which was the most significant regression reported for the new shuffle lowering. In fact, I'm out of specific test cases for AVX lowering, the rest were AVX2 I think. However, there are a bunch of pretty obvious remaining things to improve with AVX... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218213 91177308-0d34-0410-b5e6-96231b3b80d8
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