Checking for flag status

Hello

Sorry to ask a simple question here, what is the syntax to check for flag status

I have taken an example from the book MSP microcontroller basics

#include <msp430g2253.h>

#define LED_0 BIT0
#define LED_1 BIT6
#define LED_OUT P1OUT
#define LED_DIR P1DIR

void main(void)
{
WDTCTL = WDTPW + WDTHOLD;
LED_DIR = LED_0 + LED_1;
LED_OUT &= ~(LED_0 + LED_1);

TACTL = TASSEL_2 + MC_2 + ID_3 + TACLR;

while(1)
{

   //check for timer A TAFIG interrupt bit, if activated toggle LED 
    while(TACTL_bit.TAIFG == 0)  //what is the syntax to check bit status
     {}

     TACTL_bit.TAIFG = 0  //same here
     LED_OUT ^= LED_0|LED_1;
}

}

Thank you!

Jason