Lesson plan
Opcode prefix
In computing, an opcode prefix is a numeric prefix code that alters the function of a following opcode. On some instruction set architectures multiple opcode prefixes are allowed sequentially, with all combining to alter the subsequent opcode. The opcode prefix is a portion of a larger machine language instruction that specifies the operation to be performed. In addition to the opcode, some instructions specify the operands the operation will act upon. Opcode prefixes may alter the number, size, or addressing mode of the operands. RISC processors do not use opcode prefixes.
Article summary
In computing, an opcode prefix is a numeric prefix code that alters the function of a following opcode. On some instruction set architectures multiple opcode prefixes are allowed sequentially, with all combining to alter the subsequent opcode. The opcode prefix is a portion of a larger machine language instruction that specifies the operation to be performed. In addition to the opcode, some instructions specify the operands the operation will act upon. Opcode prefixes may alter the number, size, or addressing mode of the operands. RISC processors do not use opcode prefixes.
Key claims
No claims recorded.
Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.