pub unsafe fn _mm256_maskz_shrdv_epi64(
    k: u8,
    a: __m256i,
    b: __m256i,
    c: __m256i
) -> __m256i
🔬 This is a nightly-only experimental API. (stdsimd)
This is supported on x86-64 and target feature avx512vbmi2,avx512vl only.
Expand description

Concatenate packed 64-bit integers in b and a producing an intermediate 128-bit result. Shift the result right by the amount specified in the corresponding element of c, and store the lower 64-bits in dst using zeromask k (elements are zeroed out when the corresponding mask bit is not set).

Intel’s documentation