MIPS Control Flow Instructions Quiz
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Questions and Answers

What does the MIPS instruction beq do?

The beq instruction branches to a labeled instruction if the values in the two specified registers are equal.

How does the bne instruction differ from the beq instruction?

The bne instruction branches to a labeled instruction if the values in the specified registers are not equal.

In MIPS, what is the purpose of using the j instruction?

The j instruction performs an unconditional jump to a specified labeled instruction.

How would you compile a simple if statement using MIPS instructions?

<p>You would use a combination of <code>bne</code>, arithmetic instructions like <code>add</code> or <code>sub</code>, and a jump instruction to manage the flow depending on the condition.</p> Signup and view all the answers

Explain the process of compiling a while loop in MIPS assembly.

<p>You would use a label to denote the start of the loop, followed by an instruction to load the value to check, a conditional branch, and then the increment operation continued in a loop.</p> Signup and view all the answers

What registers are involved in compiling the while (save[i] == k) loop example?

<p>The registers involved are $s3 for the index <code>i</code>, $s5 for the value <code>k</code>, and $s6 for the base address of the <code>save</code> array.</p> Signup and view all the answers

What does slt instruction do in the context of MIPS control flow?

<p>The <code>slt</code> instruction sets a register to 1 if the first operand is less than the second operand; otherwise, it sets it to 0.</p> Signup and view all the answers

Why is it important to calculate addresses in MIPS when executing array operations?

<p>Calculating addresses is crucial because MIPS uses base addresses and offsets to access specific array elements, ensuring proper data retrieval.</p> Signup and view all the answers

Study Notes

MIPS Control Flow Instructions

  • MIPS utilizes control flow instructions to manage program execution flow, enabling branching and looping based on conditions
  • Conditional Operations:
    • Branch to labeled instruction based on a condition being true
    • Otherwise, continue sequentially
    • beq rs, rt, L1: Branch to instruction labeled L1 if rs == rt
    • bne rs, rt, L1: Branch to instruction labeled L1 if rs != rt
    • j L1: Unconditional jump to instruction labeled L1

Compiling If statements

  • C code: 
    if (i == j)
    f = g + h;
else
    f = g - h;
    • Registers are assigned for variables f, g, h, i, and j as $s0, $s1, $s2, $s3, and $s4 respectively
  • MIPS Compiled code: 
    bne   $s3, $s4, Else 
add   $s0, $s1, $s2
j     Exit 
Else:  sub $s0, $s1, $s2
Exit: ...

Compiling Loop statements

  • C code: 
    while (save[i] == k)
    i += 1;
    • Variables i, k, and the address of the save array are stored in registers $s3, $s5, and $s6 respectively, assuming save is a word type array.
  • MIPS Compiled code: 
    Loop:      sll      $t1,    $s3, 2
            add      $t1,    $t1, $s6
            lw       $t0,    0($t1)
            bne      $t0,    $s5, Exit
            addi     $s3,    $s3, 1
            j        Loop
Exit: ...

More Conditional Operations

  • Set Less Than (slt): Sets result to 1 if a condition is true, otherwise to 0
    • Example: slt $t0, $s1, $s2 sets $t0 to 1 if $s1 is less than $s2, otherwise to 0.

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Lecture Notes: MIPS Case Study (Control Flow Instruction) PDF

Description

Test your understanding of MIPS control flow instructions, including branching and looping. This quiz covers conditional operations, compiling if statements, and loop statements in both C and MIPS code. Improve your knowledge of how program execution is managed in MIPS architecture.

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