December 2006
Beginner
320 pages
11h 17m
English
Content preview from Inside the MachineBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 2. The Mechanics of Program Execution
Now that we understand the basics of computer organization, it’s time to take a closer look at the nuts and bolts of how stored programs are actually executed by the computer. To that end, this chapter will cover core programming concepts like machine language, the programming model, the instruction set architecture, branch instructions, and the fetch-execute loop.
Opcodes and Machine Language
If you’ve been following the discussion so far, it shouldn’t surprise you to learn that both memory addresses and instructions are ordinary numbers that can be stored in memory. All of the instructions in a program like Example 1-1 are represented inside the computer as strings of numbers. Indeed, a program is ...
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