MSP432P401R: Setting 2 GPIO interrupts on on same port?

You can't. They're both connected to the same vector (PORT1_IRQHandler) which will be called for either (or both).

You can distinguish in the ISR by checking P1->IFG (and/or P1->IN, depending on your application). Something like:

void PORT1_IRQHandler(void)
{
    if (P1->IFG & BIT1) {   // S1 (P1.1) triggered?
       // S1 stuff
       P1->IFG &= ~BIT1;
    }
    if (P1->IFG & BIT4) {   // S2 (P1.4) triggered?
       // S2 stuff
       P1->IFG &= ~BIT4;
    }
    return;
}

Thanks a lot 

That actually works!

I have a minor question, now I am learning from prof Valvano's lecture on TI website and of course looking at MSP432 data sheet, Launchpad user's guide, what I really lacking here is a programming guide

To be more clear, that is the first time to know that I can point to some pin on port1 clear flag register using P1->IFG (I used to the driverlib, e.g. GPIO_clearInterruptFlag (GPIO_PORT_P1, GPIO_PIN4);)

so what is the available programming guide for MSP432?

Thanks in advance