MSP432P401R: Program optimization problem in Keil -- MSP432P401R timer interrupt

Part Number: MSP432P401R

Hi Team,

My customer is using MSP432P401R base on keil IDE. Now, they meet an issue when do the code optimization.  In TA0 interrupt service function, there are two tasks. One is trigger ADC interrupt, another is clear interrupt flag. If they set the optimization level as 01, the timer interrupt will be triggered frequently.

The code is as below:

void TA0_N_IRQHandler(void)
{
	AdcStart();	
	Timer_A_clearInterruptFlag(TIMER_A0_BASE);
}

void AdcStart(void)
{
    /* According to the datasheet: When any other trigger source is used to start a sequence, 
     * ADC14ENC must be toggled between each sequence. 
     * ADC14ENC low pulse duration must be at least three ADC14CLK cycles.
     * Use timer to trigger conversion  */	
	/* Triggering the start of the sample */
	ADC14_disableConversion();	
	nopdelay();               /* fADCLK=MCLK/8*/
	ADC14_enableConversion();
	
	ADC14_toggleConversionTrigger();
}

The assembly is as below with code optimization  (optimization level = 01):

The assembly is as below without code optimization  (optimization level = 00):

So could you give some comments about the issue? Thanks.