Port manipulation PINx commands with Arduino Due ?

Hardware Arduino Due
40 
REG_PIOB_SODR = 0x1 << 27;
delay(1000);
REG_PIOB_CODR = 0x1 << 27;
delay(1000);

Although not having deep knowledges I could follow this.

But I don't know how to use this to
a) convert data on 8 input pins to a one byte value and
b) set other 8 output pins to the value of another byte value
both as quick as possible.
There are no limitations which pins to use as long as I can use Serial Input.

Can you help me?

Thanks!