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Commit 9c8ec99c authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][AVX] Combine 128/256-bit lane shuffles with zeroable upper subvectors to... 

[X86][AVX] Combine 128/256-bit lane shuffles with zeroable upper subvectors to EXTRACT_SUBVECTOR (PR40720)

As explained on PR40720, EXTRACTF128 is always as good/better than VPERM2F128/SHUF128, and we can use the implicit zeroing of the uppers.
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