IRQ2BIT16
#define INTC_PRIOCLEAR(i) (~(INTC_IRQ_HIPRIO << IRQ2BIT16((i))))
#define INTC_PRIOENABLE(i) (INTC_IRQ_ENABLED << IRQ2BIT16((i)))
#define INTC_PRIOHI(i) (INTC_IRQ_HIPRIO << IRQ2BIT16((i)))