Function _mm_cmpeq_epu64_mask

#[target_feature(enable = "avx512f", enable = "avx512vl")]
pub const fn _mm_cmpeq_epu64_mask(a: __m128i, b: __m128i) -> __mmask8

Compare packed unsigned 64-bit integers in a and b for equality, and store the results in mask vector k.

Intel's documentation