ARM Immediate Value Encoding
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Questions and Answers

What is the total number of basic data processing instructions in ARM processors?

  • 12
  • 64
  • 16 (correct)
  • 32

    • What is the number of bits used to encode immediate values in ARM instructions?

  • 12 bits (correct)
  • 8 bits
  • 16 bits
  • 32 bits

    • What is the operation performed by the instruction 'ADD r0, r2, r3'?

  • r0 = r2 - r3
  • r0 = r2 * r3
  • r0 = r2 + r3 (correct)
  • r0 = r2 / r3

    • What is the result of the operation '0xD7 ROR 0'?

    <p>215</p> Signup and view all the answers

    What is the name of the author of the article about ARM immediate value encoding?

    <p>Alisdair McDiarmid</p> Signup and view all the answers

    What is the date when the article about ARM immediate value encoding was posted?

    <p>12th January 2014</p> Signup and view all the answers

    What is the website where the article about ARM immediate value encoding is hosted?

    <p>alisdair.mcdiarmid.org</p> Signup and view all the answers

    What is the number of operands that can be used with each data processing instruction?

    <p>Several</p> Signup and view all the answers

    What is the operation performed by the instruction 'ADD r0, r2, r3, LSL #4'?

    <p>r0 = r2 + (r3 &lt;&lt; 4)</p> Signup and view all the answers

    What is the term used to describe the binary representations of simple instructions?

    <p>Machine code</p> Signup and view all the answers

    Study Notes

    ARM Immediate Value Encoding

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

    Machine Code and ARM Processors

    • Machine code is the binary representation of simple instructions that computer processors run on.
    • ARM processors (like those in iPhones and other devices) have 16 basic data processing instructions.

    Data Processing Instructions

    • Each data processing instruction can work with several combinations of operands.
    • Examples of ADD instructions include:
      • ADD r0, r2, r3 (r0 = r2 + r3)
      • ADD r0, r2, r3, LSL #4 (r0 = r2 + (r3 << 4))

    Immediate Value Encoding

    • The immediate value is represented using 12 bits of instruction space.
    • The encoding scheme allows for a useful set of 32-bit constants to be represented.

    Example Immediate Value

    • The immediate value 0x000000D7 can be represented in the instruction space.
    • The binary representation of this value is: 00000000 00000000 00000000 11010111.
    • The value can be rotated right by 0 bits to get 215 (0xD7).

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    Description

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

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