The significance of XOR in embedded C language

Bitwise operations are divided into ： And , or , Not

But why is there an XOR ？

And ： All two are 1, It's just 1, Otherwise 0.

or ： As long as one is 1, Namely 1, All two are 0, Output is 0

Not ：0 change 1,1 change 0

In the past, in class , The teacher told us

The role of and , To make someone bit Used to clear

The role of or , To make someone bit Set up 1

But there is no function of XOR

Exclusive or ： Same as 0, Different for 1

The most classic application of XOR , It is the clearing of registers . The classic one x86 Architecture , Frequently used register zeroing

First , Read the value of this register , Then let the value and the register XOR , You can clear the entire register

Especially in X86 In assembly language programming , You often see this XOR clear operation , That's why XOR is introduced