func sys_op_4(op1, crn, crm, op2 uint32) sys {
	sysInst := sysInstFields{uint8(op1), uint8(crn), uint8(crm), uint8(op2)}
	return sysInst.getType()
}

func is_zero(x uint32) bool {
	return x == 0
}

func is_ones_n16(x uint32) bool {
	return x == 0xffff
}

func bit_count(x uint32) uint8 {
	var count uint8
	for count = 0; x > 0; x >>= 1 {
		if (x & 1) == 1 {
			count++
		}
	}
	return count

	return !move_wide_preferred_4((instr>>31)&0x1, (instr>>22)&0x1, (instr>>10)&0x3f, (instr>>16)&0x3f)
}

func mov_movn_32_movewide_cond(instr uint32) bool {
	return !(is_zero((instr>>5)&0xffff) && (instr>>21)&0x3 != 0x0) && !is_ones_n16((instr>>5)&0xffff)
}

func mov_movn_64_movewide_cond(instr uint32) bool {
	return !(is_zero((instr>>5)&0xffff) && (instr>>21)&0x3 != 0x0)
}

func mov_add_32_addsub_imm_cond(instr uint32) bool {