Function vrshrn_high_n_u16 

pub fn vrshrn_high_n_u16(
    a: uint8x8_t,
    b: uint16x8_t,
    const N: i32,
) -> uint8x16_t

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

Rounding shift right narrow Arm’s documentation