Function vrshrn_high_n_u32 

pub fn vrshrn_high_n_u32(
    a: uint16x4_t,
    b: uint32x4_t,
    const N: i32,
) -> uint16x8_t

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

Rounding shift right narrow Arm’s documentation