Why Vectored Interrupt Controller IRQ -1 ?

Hello There,

External Interrupt controller VIC have better speed performance then internal interrupt controller but in my sample code (below) for understanding VIC, won't reflect edge_capture status on pin TEMP_OUT_BASE

like if edge_capture get high it will put 1 on TEMP_OUT_BASE otherwise put 0 on TEMP_OUT_BASE.

my aim is to reading 2D-array whenever edge_capture get interrupt.

"IOWR_ALTERA_AVALON_PIO_DATA(TEMP_OUT_BASE,0x1)"

*i have attached my sopcinfo for refrence.

int main()
{
     int rc;
     unsigned long int count =0;
    printf("\n\tInitillize the Enhanced Interrupt..");
   # ifdef LOAD_DATA_BASE
        init_load_data();
   # endif
     rc = alt_ic_irq_enable(VIC_INTERRUPT_CONTROLLER_ID,LOAD_DATA_IRQ);
     if(rc<0)     printf("\n\tEnhance Interrupt NOT enabled, Return value = %d\n",rc);
     else         printf("\n\tEnhnace interrupt ENABLED, Return value = %d\n",rc);
/* //---Should i add these alt_ic_irq_enable for other peripheral also...........??    
    rc = alt_ic_irq_enable(VIC_INTERRUPT_CONTROLLER_ID,JTAG_UART_IRQ);
    rc = alt_ic_irq_enable(VIC_INTERRUPT_CONTROLLER_ID,SYS_CLK_TIMER_IRQ);
*/
     IOWR_ALTERA_AVALON_PIO_DATA(STRT_OUT_BASE,HIGH); //Generate Start Signal
            do
              {
                  if(edge_capture)
                  {
                  IOWR_ALTERA_AVALON_PIO_DATA(TEMP_OUT_BASE,0x1);    //TEMP_OUT not Visible on Oscilloscope
                  edge_capture = 0;                            //Clear Interrupt
                  //printf("\nHIGH");  //Visible on Console
                  }
                  IOWR_ALTERA_AVALON_PIO_DATA(TEMP_OUT_BASE,0x0);
                  //printf("\t\tLOW\n"); //Visible on Console
              }while(1);
     return 0;
}

Regards

kaushal