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[X86][AVX] Handle vperm2x128 shuffling of a subvector splat.

Authored by RKSimon on Jan 20 2021, 10:15 AM.

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[X86][AVX] Handle vperm2x128 shuffling of a subvector splat.

We already handle "vperm2x128 (ins ?, X, C1), (ins ?, X, C1), 0x31" for shuffling of the upper subvectors, but we weren't dealing with the case when we were splatting the upper subvector from a single source.

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Committed
RKSimonJan 20 2021, 10:16 AM
Parents
rG36e62b1ff7e7: [AArch64] Fix -Wunused-but-set-variable in GCC -DLLVM_ENABLE_ASSERTIONS=off…
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