Function core::arch::x86::_mm256_madd_epi16

pub unsafe fn _mm256_madd_epi16(a: __m256i, b: __m256i) -> __m256i

This is supported on x86 and target feature avx2 only.

Multiplies packed signed 16-bit integers in a and b, producing intermediate signed 32-bit integers. Horizontally add adjacent pairs of intermediate 32-bit integers.

Intel’s documentation