aarch32_insn_extract_reg_num
u32 aarch32_insn_extract_reg_num(u32 insn, int offset);
rn = aarch32_insn_extract_reg_num(instr, A32_RN_OFFSET);
rt2 = aarch32_insn_extract_reg_num(instr, A32_RT2_OFFSET);
destreg = aarch32_insn_extract_reg_num(instr, A32_RT_OFFSET);
aarch32_insn_extract_reg_num(instr, A32_RT2_OFFSET), data);