Machine instruction
A machine instruction is an operation encoded for direct execution by a processor according to its instruction set.
Modern C
A machine instruction is a processor-level operation encoded for execution by a particular instruction set.
- How it is used
- Connects C code to processor operations through assembler output.
- How deep it goes
- Explains registers, memory, labels, and one instruction concretely without descending into complete processor internals.
- Examples
- Uses `movl $0, -16(%rbp)` and a complete assembler version of the `fgoto` function.
- What you can do after
- Understand how assembler instructions represent C operations on registers, memory, labels, and control flow.
Rust in Action: Systems programming concepts and techniques
An instruction is an encoded command that a processor can fetch and execute, including commands expressed in assembly language.
- How it is used
- Uses machine instructions to reveal CPU operation and build a small CHIP-8 emulator directly in hexadecimal.
- How deep it goes
- Builds from one addition instruction through opcode decoding and dispatch, stopping at a minimal CPU without memory.
- Examples
- Demonstrates CHIP-8 opcode 0x8014, register addition, opcode-field extraction, and a CPU decoding loop.
- What you can do after
- Builds a minimal CPU emulator that loads registers, decodes hexadecimal instructions, and executes an addition operation.
Read how Rust in Action: Systems programming concepts and techniques explains machine instruction →
Related concepts
- branch on plusincludes · Branch on plus is the 6502 BPL instruction, which branches when the negative flag is clear.
- branchincludes · Branching is the selection among alternative execution paths according to a condition, outcome, or program state.
- codecontrasts with · Code is instructions or declarations expressed in a programming language that specify computational operations or software behavior.
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