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// Timer_A3 Interrupt Vector (TAIV) handler
#pragma vector=TIMERA1_VECTOR
__interrupt void Timer_A(void)
{
  switch (TAIV, 10)        // Efficient switch-implementation
  {
    case  2:                                // TACCR1
      P1OUT ^= 0x01;                        // Toggle P1.0
      TACCR1 += 50000;                      // Add Offset to TACCR1
      break;
    case  4: break;                         // TACCR2 not used
    case 10: break;                         // Overflow not used
  }
}

#define switch(a,b) switch(a<<4|b)


....
...
 uint8_t a=1;
 uint8_t b=2;
.....
    switch(a,b)
    {
        case 0x12: 
            break;
       ....
    }

#pragma vector=TIMER1_A1_VECTOR
__interrupt void TIMER1_A1_ISR(void)
{
  switch(__even_in_range(TA1IV,4))
  {
    case  2: // TA1-CCR1
    {
.
.

  /*
   * Support for efficient switch:es. E.g. switch(__even_in_range(x, 10))
   *
   * Note that the value must be even and in the range from 0 to
   * __bound, inclusive. No code will be generated that checks this.
   *
   * This is typically used inside interrupt dispatch functions, to
   * switch on special processor registers like TAIV.
   */

  __intrinsic unsigned short __even_in_range(unsigned short __value,
                                             unsigned short __bound);