What is XOR in assembly?
The XOR instruction performs a bit wise Exclusive OR operation between corresponding bits in the two operands and places the result in the first operand.
Is x86 instruction set?
x86 is a family of complex instruction set computer (CISC) instruction set architectures initially developed by Intel based on the Intel 8086 microprocessor and its 8088 variant.
How many instructions does 8086 have?
117 basic instructions
Ans. There are 117 basic instructions in the instruction set of 8086.
What is instruction set in microprocessor?
An instruction set is a group of commands for a central processing unit (CPU) in machine language. The term can refer to all possible instructions for a CPU or a subset of instructions to enhance its performance in certain situations.
What does XOR ax ax do?
xor ax, ax would do the same as mov ax, 0 , but with additional capability of setting the flag to zero and clearing carry according to the logic of xor. And xor consumes less clocks than mov does in some old architectures. mov eax,eax would take up 5 bytes in byte code where xor eax,eax would consume 2 bytes.
How many bits is 8086?
The 8086 (also called iAPX 86) is a 16-bit microprocessor chip designed by Intel between early 1976 and June 8, 1978, when it was released.
What is 32 bit instruction set?
A program written in machine language is a series of 32-bit numbers representing the instructions. Like other binary numbers, these instructions can be stored in memory. This is called the stored program concept, and it is a key reason why computers are so powerful.
Where is XOR used?
The XOR cipher is often used in computer malware to make reverse engineering more difficult. If the key is random and is at least as long as the message, the XOR cipher is much more secure than when there is key repetition within a message.
Does XOR set flags in assembly?
the XOR (and many other arithmetic/logic operations) will set the zero flag of the status register if the result of the operation is zero.
What is XOR EAX EAX?
The XOR EAX,EAX simply 0’s out the EAX register, it executes faster than a MOV EAX,$0 and doesn’t need to fetch immediate data of 0 to load into eax. It’s very obvious this is the “return 0” that MSVC is optimizing EAX is the register used to return a value from a function in MSVC.
Do 128 bit processors exist?
CPUs that process 128 bits as a single unit, compared to 8, 16, 32 or 64 bits. As of 2022, there are no 128-bit computers on the market. A 128-bit processor may never occur because there is no practical reason for doubling the basic register size.