def Imm_gen(inst_code):
    test = inst_code[25:32]
    if test == '0010011':
        imm_out = 20*inst_code[0]+inst_code[0:12]
    elif test == '0000011':
        pass
    elif test == '0100011':
        pass
    elif test == '1100011':
        pass
    elif test == '1101111':
        pass
    elif test == '1100111':
        pass
    elif test == '0110111':
        pass
    return imm_out