Function _mm256_maskz_cvtpd_ph 

pub fn _mm256_maskz_cvtpd_ph(k: __mmask8, a: __m256d) -> __m128h

Available on x86 and target feature avx512fp16 and target feature avx512vl only.

Convert packed double-precision (64-bit) floating-point elements in a to packed half-precision (16-bit) floating-point elements, and store the results in dst using zeromask k (elements are zeroed out when the corresponding mask bit is not set). The upper 64 bits of dst are zeroed out.

Intel’s documentation