Y86 Data Movement Instructions Quiz
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Questions and Answers

What does an immediate operand represent in Y86?

  • An undefined value
  • A register value
  • A constant value (correct)
  • A memory address

    • In Y86, which type of instruction affects both read and write operations on the destination operand?

  • Data movement instructions
  • Memory instructions
  • ALU instructions (correct)
  • Control instructions

    • What kind of operands do all 4 ALU instructions in Y86 use?

  • Two register operands (correct)
  • Three register operands
  • Immediate operands
  • Memory operands

    • Which type of Y86 instructions set the 3 flags used in the architecture?

    <p>ALU instructions</p> Signup and view all the answers

    How are address expressions for memory operands structured in Y86?

    <p>(BASE + DISP)</p> Signup and view all the answers

    What happens to the flags when non-ALU instructions are executed in Y86?

    <p>They remain unaffected</p> Signup and view all the answers

    Which type of jump instruction is unconditional in Y86?

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

    What must be the condition of flags for a 'je' instruction to take the jump in Y86?

    <p>'ZF = 1'</p> Signup and view all the answers

    'jg' instruction in Y86 stands for:

    <p>'Jump greater'</p> Signup and view all the answers

    'rrmovq' instruction in Y86 is used for:

    <p>'Register-register move'</p> Signup and view all the answers

    What happens when a jump (or branch) is not taken in Y86?

    <p>The next instruction executed will be the one immediately after the jump instruction</p> Signup and view all the answers

    How does the stack grow in memory when new data is pushed onto it in Y86?

    <p>It grows downward; towards lower addresses</p> Signup and view all the answers

    What is the purpose of saving the calling subroutine's rbp before setting its own base/frame pointer?

    <p>To allow for restoration of the calling subroutine's base/frame pointer</p> Signup and view all the answers

    In Y86, how are parameters passed on the stack?

    <p>They are pushed onto the stack in reverse order</p> Signup and view all the answers

    What does each subroutine in Y86 receive to use as a portion of the stack?

    <p>A frame</p> Signup and view all the answers

    What is always pushed onto the stack after all parameters when calling a subroutine?

    <p>The return address</p> Signup and view all the answers

    What do labels represent in Y86?

    <p>Strings that mark addresses in memory</p> Signup and view all the answers

    What are two things that the call instruction in Y86 accomplishes?

    <p>Pushes parameters onto the stack and jumps to a target location</p> Signup and view all the answers

    What do the pushq and popq instructions do in Y86?

    <p>Push data onto and pop data off the stack, respectively</p> Signup and view all the answers

    What two things does the ret instruction do in Y86?

    <p>Restores the caller's base pointer and returns control to caller</p> Signup and view all the answers

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