Function core_arch::x86::_mm256_maddubs_epi16

pub unsafe fn _mm256_maddubs_epi16(a: __m256i, b: __m256i) -> __m256i

This is supported on x86 and target feature avx2 only.

Vertically multiplies each unsigned 8-bit integer from a with the corresponding signed 8-bit integer from b, producing intermediate signed 16-bit integers. Horizontally add adjacent pairs of intermediate signed 16-bit integers

Intel's documentation