Function _mm512_testn_epi64_mask
#[target_feature(enable = "avx512f")]
pub const fn _mm512_testn_epi64_mask(a: __m512i, b: __m512i) -> __mmask8Compute the bitwise NAND of packed 64-bit integers in a and b, producing intermediate 64-bit values, and set the corresponding bit in result mask k if the intermediate value is zero.