Function _mm_mask_movedup_pd 

pub fn _mm_mask_movedup_pd(src: __m128d, k: __mmask8, a: __m128d) -> __m128d

Available on x86 and target feature avx512f and target feature avx512vl only.

Duplicate even-indexed double-precision (64-bit) floating-point elements from a, and store the results in dst using writemask k (elements are copied from src when the corresponding mask bit is not set).

Intel’s documentation