Function vrshrn_n_u16 

pub fn vrshrn_n_u16(a: uint16x8_t, const N: i32) -> uint8x8_t

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

Rounding shift right narrow Arm’s documentation