Performance & Systems
Aug 7, 2026
x86-64 Machine Code Encoding ModRM Encoding with Examples
x86-64 Machine Code Encoding : ModR/M Encoding with ExamplesThe ModR/M byte is a crucial component of x86-64 machine code encoding that specifies the addressing mode, the register operand, and the memory addressing details for many instructions. It acts as a flexible encoding scheme to select registers or memory…
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Performance & Systems
Aug 7, 2026
x86-64 Machine Code Encoding Overview of Machine Code Format
x86-64 Machine Code Encoding : Overview of Machine Code Format Machine code encoding in the x86-64 architecture is a complex, multi-component format designed to provide flexible and efficient instruction representation. Each instruction's binary encoding consists of multiple fields that specify the operation, the…
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Performance & Systems
Aug 7, 2026
Designing an x86-64 Assembler Detailed Examples for Each Instruction Class
Designing an x86-64 Assembler: Detailed Examples for Each Instruction ClassIn this section, we provide concrete, detailed examples for the primary instruction classes covered in this chapter. These examples illustrate typical usage patterns, operand encoding considerations, and highlight subtle nuances necessary for…
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Performance & Systems
Aug 7, 2026
Stack Memory A Low-Level Deep Dive into Origins, Performance, Limits, and Risks
Stack Memory: A Low-Level Deep Dive into Origins, Performance, Limits, and Risks IntroductionIn this article, we’ll take a deep and low-level look into Stack Memory, a crucial concept in system design and runtime execution. We'll explore its architectural origins, relationship with processors and operating systems,…
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Performance & Systems
Aug 7, 2026
Designing an x86-64 Assembler SIMD Instructions
Designing an x86-64 Assembler: SIMD Instructions 1. SIMD Instructions OverviewSingle Instruction Multiple Data (SIMD) instructions are a critical component of the x86-64 architecture that enable parallel processing by performing the same operation simultaneously on multiple data elements packed into vector registers.…
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Performance & Systems
Aug 7, 2026
Designing an x86-64 Assembler System-Level Instructions
Designing an x86-64 Assembler: System-Level Instructions 1. Overview of System-Level InstructionsSystem-level instructions in the x86-64 architecture provide critical capabilities to control and interact with the processor’s privileged state, system resources, hardware configuration, and execution environment. These…
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Performance & Systems
Aug 7, 2026
Designing an x86-64 Assembler String Instructions
Designing an x86-64 Assembler: String Instructions 1. Overview of String InstructionsString instructions in the x86-64 ISA provide specialized operations designed to efficiently manipulate sequences of bytes or words in memory, often referred to as "strings." These instructions are optimized for bulk data operations…
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Performance & Systems
Aug 7, 2026
Designing an x86-64 Assembler Stack Manipulation
Designing an x86-64 Assembler: Stack Manipulation 1. Stack Manipulation Instructions OverviewStack manipulation instructions form a core subset of the x86-64 instruction set, enabling explicit control over the CPU stack — a region of memory that supports function calls, local variable storage, parameter passing, and…
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Performance & Systems
Aug 7, 2026
Designing an x86-64 Assembler Control Flow
Designing an x86-64 Assembler: Control Flow1. Control Flow Instructions OverviewControl flow instructions direct the execution sequence of a program by altering the normal linear flow of instructions. They enable decision-making, looping, subroutine calls, and interrupt handling, which are fundamental for implementing…
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