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

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Which instruction performs R5 := (*R4)?

Consider this program fragment:

i := 0;
sum := 0;
while i<n do
   { sum := sum + i;
     i := i + 1;
   }
a := sum;

Which of the following is a correct translation from high to low level?

   i := 0;
   sum := 0;
place1
   sum := sum + i;
   i := i + 1;
   if (i<n) then goto place1;
   a := sum;

   i := 0;
   sum := 0;
place1
   if (i<n)=False then goto place2;
   sum := sum + i;
   i := i + 1;
   goto place1;
place2
   a := sum;

View this question

Suppose R1 contains 00c6 and R2 contains 0dc1.

What is the effective address in this instruction?

lea  R2,8[R1]

Give the answer as a single hex word, with no $.

Example format of answer: f32b (four consecutive hex digits)

View this question

Which instruction adds 5 to register R2?

Which instruction puts a pointer to x into R3?

The variable p is a pointer to a record x. Which instruction puts p into R8?

When you are using a jump table, what could go wrong if the program

fails to check that the code is valid?

The program would be longer

❌

The program could jump to a random location, and could even

execute data

✅

The program would be slower

❌

View this question

What is the label of the instruction that will be executed

after the following code executes?

    lea   R5,JT[R0]
    lea   R4,3[R0]
    add   R4,R4,R4
    add   R4,R5,R4
    jump  0[R4]
JT  jump  placeA[R0]
    jump  placeB[R0]
    jump  placeC[R0]
    jump  placeD[R0]
    jump  placeE[R0]
    jump  placeF[R0]
placeG