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ARM Immediate Value Encoding

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Questions and Answers

What is unique about the way ARM processors encode immediate values?

They use 12 bits of instruction space to represent a useful set of 32-bit constants. (correct)

They use 32 bits of instruction space to represent a limited set of 16-bit constants.

They use 8 bits of instruction space to represent a limited set of 8-bit constants.

They use 16 bits of instruction space.

How many basic data processing instructions do ARM processors have?

16 (correct)

What is the purpose of the LSL instruction in the ADD instruction?

To perform a logical shift left. (correct)

To shift the operands to the left.

To rotate the operands to the right.

To perform a circular shift left.

What is the result of the instruction 'ADD r0, r2, r3, LSL #4'?

r0 = r2 + (r3 shifted 4 bits to the left) (C) Signup and view all the answers

What is the binary representation of the hex value 0xD7?

01101101 (B) Signup and view all the answers

What is the result of rotating the binary number 01101101 right by 0 bits?

215 (B) Signup and view all the answers

What is the purpose of the ROR instruction?

To rotate the operands to the right. (B) Signup and view all the answers

How many operands can the ADD instruction work with?

3 (D) Signup and view all the answers

What is the main function of the ADD instruction?

To add two or more operands. (A) Signup and view all the answers

What is the typical design of the ARM processor architecture?

Elegant, pragmatic, and quirky. (D) Signup and view all the answers

Study Notes

ARM Immediate Value Encoding

ARM instruction set encodes immediate values in an unusual way, using only 12 bits of instruction space to represent a useful set of 32-bit constants.

Machine Code and ARM Processors

Machine code is a binary representation of simple instructions that computer processors run on.
All ARM processors have 16 basic data processing instructions.
Each data processing instruction can work with several combinations of operands.

Data Processing Instructions

Examples of data processing instructions include ADD instructions:
- ADD r0, r2, r3 ; r0 = r2 + r3
- ADD r0, r2, r3, LSL #4 ; r0 = r2 + (r3 shifted left by 4 bits)

Instruction Encoding

ARM instruction encoding uses 32 bits, with 12 bits allocated for immediate values.
The immediate value is encoded in a way that allows for a useful set of 32-bit constants to be represented.

Example Instruction Encoding

Example instruction encoding: 0x000000D7
Breakdown of the encoding:
- 0x0 (most significant bits)
- 0xD7 (least significant bits, rotated right by 0 bits to get 215)

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Description

Learn about the unique way ARM instructions encode immediate values, using only 12 bits of instruction space to represent a useful set of 32-bit constants.