x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit version of the x86 instruction set, first released in 1999. It introduced two new modes of operation, 64-bit mode and compatibility mode, along with a new 4-level paging mode.

microprocessor based on its “x86-64” instruction set. As the name implies, x86-64 is an evolution of the Intel instruction set to 64 bits. It maintains full backward compatibility with IA32, but it adds new data formats, as well as other features that enable higher capacity and higher performance. With x86-64, AMD

06/08/2021 · The x86-64 instruction set defines many opcodes and many ways to encode them, depending on several factors. Legacy opcodes . Legacy (and x87) opcodes consist of, in this order: mandatory prefix; REX prefix; opcode. Mandatory prefix

Push the address of the next instruction and start executing func. call print_int: ret: Pop the return program counter, and jump there. Ends a subroutine. ret: add dest,src: dest=dest+src: add rax,rdx ; Add rbx to rax: mul src: Multiply rax and src as unsigned integers, and put the result in rax. High 64 bits of product (usually zero) go into rdx.

Intel® 64 and IA-32 Architectures Software Developer’s Manual Volume 2 (2A, 2B, 2C & 2D): Instruction Set Reference, A-Z NOTE: The Intel 64 and IA-32 Architectures Software Developer's Manual consists of three volumes: Basic Architecture, Order Number 253665; Instruction Set Reference A-Z, Order Number 325383;

Instructions (basically identical to 32-bit x86) For gory instruction set details, read this per-instruction reference , or the full Intel PDFs: part 1 (A-M) and part 2 (N-Z) . Mnemonic

x86 instruction set Three main groups Data movement (from memory and between registers) Arithmetic operations (addition, subtraction, etc.) Control flow (jumps, function calls)