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Commit ae33cbc4 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] LowerVectorAllZeroTest - add support for >256-bit vectors 

Reduce by splitting the vector until we reach the target size for PTEST/MOVMSK_PCMPEQ. There might be some cases where AVX512 can perform this with 512-bit vectors but so far I haven't encountered any such pattern that reaches LowerVectorAllZeroTest.

Prep work for D81547
parent f47a7766
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