Two methods to clear sleep timer CPU INT flag in CC2430?

There are two ways to clear sleep timer CPU interrupt flag:

1. #define HAL_SLEEP_TIMER_CLEAR_INT()         st(IRCON &= ~0x80;)

2. #define HAL_SLEEP_TIMER_CLEAR_INT()         st(STIF = 0;)  

The method 1 is used in  current code, according to DN116, method 2 is recommended. I want to make sure two methods are same?

Thanks

Rui