Function enc_arith_rrr

pub fn enc_arith_rrr(
    bits_31_21: u32,
    bits_15_10: u32,
    rd: Writable<Reg>,
    rn: Reg,
    rm: Reg,
) -> u32

Available on crate feature arm64 only.

Encode a 3-register aeithmeric instruction.