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In computer architecture, 64-bit integers, memory addresses, or other data units [a] are those that are 64 bits wide. Also, 64-bit central processing units (CPU) and arithmetic logic units (ALU) are those that are based on processor registers, address buses, or data buses of that size. A computer that uses such a processor is a 64-bit computer.
X86-64 Architecture Guide. Reference. This handout only mentions a small subset of the rich possibilities provided by the x86-64 instruction set and architecture. For a more complete (but still readable) introduction, consult The AMD64 Architecture Programmer’s Manual, Volume 1: Application Programming. Registers.
29 Αυγ 2010 · Usually the OS is written with CPU bitness in mind, x86-64 being a notable example of decades of backwards compatibility - you can have everything from 16-bit real-mode programs through 32-bits protected-mode programs to 64-bits long-mode programs.
Introduction to Intel® Architecture. The Basics. The goal of this paper is to describe the basic operation and function of three classes of hardware platforms based on the Intel architecture and the. Executive Summary.
A 64-bit architecture refers to a system that allows programs to access large amounts of memory, beyond the limitations of 32-bit architectures. It enables faster processing by moving more information with a single instruction and provides additional general-purpose registers for complex programs.
The 64 bit SRAM memory interface is shown in figure 10-44. The 64 bits of memory are organized in words of 4 bits, meaning that DataIn and DataOut have a 4 bit width. Each data D0..D15 occupies 4 contiguous memory cells in the array.
x86-64 Architecture Diagram. The basic architecture of the x86-64 is described in Volume 1 of the System Developer’s Manual. The following diagram is taken directly from Chapter 3 in this volume: Registers. Application Programmers generally use only the general purpose registers, floating point registers, XMM, and YMM registers.
