Instruction (computer science) | Wikipedia audio article
Channel: wikipedia tts
Date: 13/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Instruction_set_architecture


00:01:42 1 Overview
00:04:07 2 Classification of ISAs
00:05:52 3 Instructions
00:06:42 3.1 Instruction types
00:06:57 3.1.1 Data handling and memory operations
00:07:44 3.1.2 Arithmetic and logic operations
00:08:45 3.1.3 Control flow operations
00:09:21 3.1.4 Coprocessor instructions
00:09:43 3.2 Complex instructions
00:12:34 3.3 Parts of an instruction
00:15:04 3.3.1 Number of operands
00:17:43 3.4 Register pressure
00:21:37 3.5 Instruction length
00:23:04 3.6 Code density
00:24:42 3.7 Representation
00:25:17 4 Design
00:29:15 5 Instruction set implementation
00:29:45 6 See also
00:32:16 7 References
00:36:30 8 Further reading



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SUMMARY
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An instruction set architecture (ISA) is an abstract model of a computer. It is also referred to as architecture or computer architecture. A realization of an ISA is called an implementation. An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware. Software that has been written for an ISA can run on different implementations of the same ISA. This has enabled binary compatibility between different generations of computers to be easily achieved, and the development of computer families. Both of these developments have helped to lower the cost of computers and to increase their applicability. For these reasons, the ISA is one of the most important abstractions in computing today.
An ISA defines everything a machine language programmer needs to know in order to program a computer. What an ISA defines differs between ISAs; in general, ISAs define the supported data types, what state there is (such as the main memory and registers) and their semantics (such as the memory consistency and addressing modes), the instruction set (the set of machine instructions that comprises a computer's machine language), and the input/output model.