pub unsafe fn _mm256_maskz_shrdi_epi64(
    k: __mmask8, 
    a: __m256i, 
    b: __m256i, 
    const IMM8: i32
) -> __m256iAvailable on x86 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 imm8 bits, and store the lower 64-bits in dst using zeromask k (elements are zeroed out when the corresponding mask bit is not set).