Function safe_arch::load_f64_splat_m128d

#[must_use]pub fn load_f64_splat_m128d(a: &f64) -> m128d

This is supported with target feature sse2 only.

Loads the f64 reference into all lanes of a register.

let a = 1.0;
let b = load_f64_splat_m128d(&a);
assert_eq!(m128d::from_array([1.0, 1.0]).to_bits(), b.to_bits());