Function core::arch::x86_64::_mm256_hadd_pd

pub unsafe fn _mm256_hadd_pd(a: __m256d, b: __m256d) -> __m256d

This is supported on x86-64 and target feature avx only.

Horizontal addition of adjacent pairs in the two packed vectors of 4 64-bit floating points a and b. In the result, sums of elements from a are returned in even locations, while sums of elements from b are returned in odd locations.

Intel’s documentation