Adding ASM code to C program

unsigned char DIRECTION = 0;
unsigned char FINAL_REG = 0;
unsigned int  COUNTER = 0;
unsigned int  MAX_COUNT = 0;

/*****************************************************************
 *  setup interrupt vectors                                      *
 *****************************************************************/
#pragma code high_interrupt = 0x08
void high_interrupt (void)
{ _asm goto isr_hi _endasm
}

#pragma code

/*****************************************************************
 *  ISR (high)                                                   *
 *****************************************************************/
#pragma interrupt isr_hi

void isr_hi ()
{ if (INTCONbits.TMR0IF = 1)
  { DIRECTION = PORTB;                  //
    if ( DIRECTION && 0b00000100 )      // if enabled
    { if ( DIRECTION && 0b00000010 )    // if increment
      { if (!(FINAL_REG >>= 1))         //   "rrncf FINAL_REG,F"
          FINAL_REG = 0b10000000;       //
        while ( COUNTER++ == MAX_COUNT) //
          COUNTER = 0;                  //
      }
      else                              // else decrement
      { if (!(FINAL_REG <<= 1))         //   "rlncf FINAL_REG,F"
          FINAL_REG = 0b00000001;       //
        while ( COUNTER-- == 0)         //
          COUNTER = MAX_COUNT;          //
      }
      if ( COUNTER && 0b11111110 )      // INT_MARKER ???  Huh?
      { FINAL_REG |= 0b00010000;        //   "bsf FINAL_REG,4"
        FINAL_REG &= 0b11011111;        //   "bcf FINAL_REG,5"
      }
      else
      { FINAL_REG &= 0b11101111;        //   "bcf FINAL_REG,4"
        FINAL_REG |= 0b00001000;        //   "bsf FINAL_REG,5"
      }
      LATA = FINAL_REG;                 //
    }
    INTCONbits.TMR0IF = 0;              //
  }
}

  if ( COUNTER = TESTVALUE )
    MARKER = 1;
  else
    MARKER = 0;