Function safe_arch::convert_u16_lower4_to_u32_m128i

#[must_use]pub fn convert_u16_lower4_to_u32_m128i(a: m128i) -> m128i

This is supported with target feature sse4.1 only.

Convert the lower four u16 lanes to four u32 lanes.

let a = m128i::from([u16::MAX, 1, 2, 3, 4, 5, 6, 7]);
let c: [u32; 4] = convert_u16_lower4_to_u32_m128i(a).into();
assert_eq!(c, [u16::MAX as u32, 1, 2, 3]);