Function _mm512_cmp_pd_mask
#[target_feature(enable = "avx512f")]
pub fn _mm512_cmp_pd_mask(a: __m512d, b: __m512d, IMM8: i32) -> __mmask8Compare packed double-precision (64-bit) floating-point elements in a and b based on the comparison operand specified by imm8, and store the results in mask vector k.