CCS/CC1310: How to get the time the codes implemented need?

Part Number:CC1310

Tool/software: Code Composer Studio

Dear Sir or Madam:

     for example,I want to know the time the code below implemented need,seen below:

    {

       static uint64_t nCurrentTime1 = 0, nCurrentTime2=0, nCurrentTime3;

                       ......

          nCurrentTime1  = AONRTCCurrent64BitValueGet();

             RFQueue_nextEntry();

        nCurrentTime2 =  AONRTCCurrent64BitValueGet();

     nCurrentTime3 =  nCurrentTime2 -nCurrentTime1;

       Display_printf(dispHandle, 0,0,"  %ld",nCurrentTime3);

             .........

}

nCurrentTime3  is the accurate time needed  to implement  RFQueue_nextEntry()?

if not, how to monitor the accurate time neede to implement RFQueue_nextEntry()?