Fast GPIO esp32

///////////////////////////
// SETTING A SINGLE PIN  //
///////////////////////////
// if "pin" is a compile time constant the if statement will be compiled out.
if(pin>31) {
    // set this pin by writing the bit for the pin
    // to the high bank
    GPIO.out1_w1ts.val = (1 << ((pin - 32)&31));
} else if(pin>-1) {
    // set the pin in the low bank
    GPIO.out_w1ts = (1 << (pin &31));
}

///////////////////////////
// CLEARING A SINGLE PIN //
///////////////////////////
// if "pin" is a compile time constant the if statement will be compiled out.
if(pin>31) {
    // clear this pin by writing the bit for the pin
    // to the high bank
    GPIO.out1_w1tc.val = (1 << ((pin - 32)&31));
} else if(pin>-1) {
    // clear the pin in the low bank
    GPIO.out_w1tc = (1 << (pin &31));
}
/////////////////////////
// SET/CLEAR MANY PINS //
/////////////////////////

To do this you simply combine the flags you want to set or clear into one 32 bit value
GPIO.out_w1ts = (1<<pin_d0)|(1<<pin_d1)||(1<<pin_d6); // set pin_d0, pin_d1, and pin_d6
// above assumes those pins are less than GPIO 32
// And the same with clearing them

/////////////////////////
// NOTES               //
/////////////////////////

// This can be too fast sometimes if you use it to control timing sensitive components.
// I workaround that by setting/clearing multiple times instead of just once
//
// Even for a single pin this is much faster than digitalWrite for some reason