void I_CB(string cmd)
{
skip_space();
int src_r = R();
skip_space();
if (cur_token != ',')
error("指令不完整,期望逗号(,)");
get_src_token();
skip_space();
string label = get_word().ToUpper();
#if debug
Debug(String.Format("condition branch to {0}", label));
#endif
if (check_text_symbol(label) == false)
add_to_wait(label, line, line_at);
format_line.AppendFormat("R{0}, {1}", src_r, label);
}