pub unsafe fn _mm512_cmp_epu64_mask<const IMM3: i32>(
    a: __m512i,
    b: __m512i
) -> u8
🔬 This is a nightly-only experimental API. (stdsimd)
This is supported on x86-64 and target feature avx512f only.
Expand description

Compare packed unsigned 64-bit integers in a and b based on the comparison operand specified by imm8, and store the results in mask vector k.

Intel’s documentation