Function _mm512_maskz_cvtepi8_epi16

pub fn _mm512_maskz_cvtepi8_epi16(k: u32, a: __m256i) -> __m512i

Sign extend packed 8-bit integers in a to packed 16-bit integers, and store the results in dst using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

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