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COMPSCI1018 Computing Science 1S - Computing Systems - 2024-25

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Suppose p is a pointer to a list, and we need to implement

if p=nil then goto aardvark

This is implemented by

  load R5,p[R0]
  cmp R5,R0
  jumpeq aardvark[R0]

  cmp p,nil
  jumpeq aardvark[R0]

  lea R5,p[R0]
  cmp R5,R0
  jumpeq aardvark[R0]

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If you declare a variable with a data statement, this variable is

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Which of the following would NOT appear in a call stack?

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Which statement is NOT true?

A stack can be implemented by an array

A stack can be implemented by a linked list

A stack provides direct access to any random value on the stack

The push operation places a new value on the top of a stack

The pop operation removes the top value on a stack and returns it

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Suppose a stack was initially empty, and we have performed the

following sequence of operations:

push a, push b, push c, pop, push d, push e, pop, pop, pop

What value is returned by the last pop?

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If a procedure calls another other procedure, then it

needs to save the return address in memory to avoid

destroying the return address.

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Which one of the following statements is NOT true?

The jal instruction saves the return address in a register

The return address is the address of the instruction after jal

jal R0,banana[R0] is equivalent to jump banana[R0]

When a procedure is called, it needs the return address

in order to return to the right place

The jal instruction is used to return from a procedure to the caller

The jal instruction performs a jump, as well as loading

a value into the destination register

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Suppose this program fragment executes:

labela  add  R4,R5,R6
labelb  sub  R2,R8,R3
labelc  jal  R13,labelf[R0]
labeld  mul  R9,R2,R4
labele  lea  R3,a[R0]
labelf  add  R4,R7,R2

After it executes, the value in R13 is

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Suppose the label x refers to address 0c3a,

and mem[0c3a] = 00d2

Consider the instruction lea R3,x[R0]

Which statement is true?

The instruction performs R3 := 00d2

The instruction performs R3 := 0c3a

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Consider the instruction load R3,14[R0]

Which statement is NOT true?

The instruction performs R3 := 14

The instruction is unusual because you normally don't know the

precise address of a variable

The instruction performs R3 := mem[000e]

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