PIC12F629 small question

unsigned char i;
bit oldstate;                       // Old state flag
void main() {
OSCCAL = 0b11111101;                   // calibrate internal osilator 4 MHz
CMCON = 0b00000100;                 // CIN- analog, Internal VRef
GPIO = 0;                          //<<<<<<added
TRISIO = 0b00000010;                     // gp2 = output
VRCON  = 0b10101111;                   // sets Vref
gpio.F2 = 0;