Function vaddhn_high_u64 

pub fn vaddhn_high_u64(
    r: uint32x2_t,
    a: uint64x2_t,
    b: uint64x2_t,
) -> uint32x4_t

🔬This is a nightly-only experimental API. (stdarch_arm_neon_intrinsics #111800)

Available on ARM and target feature neon and (AArch64 or ARM or ARM64EC) and (AArch64 or ARM64EC or target feature v7) only.

Add returning High Narrow (high half). Arm’s documentation