Function safe_arch::sub_horizontal_m256d

#[must_use]pub fn sub_horizontal_m256d(a: m256d, b: m256d) -> m256d

This is supported with target feature avx only.

Subtract adjacent f64 lanes.

let a = m256d::from([1.0, 2.0, 3.0, 4.0]);
let b = m256d::from([1.0, 3.0, 5.0, 70.0]);
let c = sub_horizontal_m256d(a, b).to_array();
assert_eq!(c, [-1.0, -2.0, -1.0, -65.0]);