Function _mm256_mullo_epi64

#[target_feature(enable = "avx512dq", enable = "avx512vl")]
pub const fn _mm256_mullo_epi64(a: __m256i, b: __m256i) -> __m256i

Multiply packed 64-bit integers in a and b, producing intermediate 128-bit integers, and store the low 64 bits of the intermediate integers in dst.

Intel's Documentation