Function safe_arch::load_m128_splat_m256

#[must_use]pub fn load_m128_splat_m256(a: &m128) -> m256

This is supported with target feature avx only.

Load an m128 and splat it to the lower and upper half of an m256

let a = m128::from_array([0.0, 1.0, 2.0, 3.0]);
let b = load_m128_splat_m256(&a).to_array();
assert_eq!(b, [0.0, 1.0, 2.0, 3.0, 0.0, 1.0, 2.0, 3.0]);