def METHOD_NAME(line, line_num, cpu_type, instructions):
    start_match = description_start_regex.match(line)
    continue_match = description_continue_regex.match(line)
    if start_match:
        mnemonic = start_match.group("mnemonic")
        METHOD_NAME.last_mnemonic = mnemonic
        long_name = start_match.group("long_name")
        if mnemonic not in instructions:
            instructions[mnemonic] = Instruction(mnemonic, cpu_type)
        instructions[mnemonic].long_name = long_name
    elif continue_match:
        mnemonic = METHOD_NAME.last_mnemonic
        description = continue_match.group("description")
        instructions[mnemonic].description.append(description)