Compare and branch patterns in ARM Architecture - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to compare register R0 with zero and branch if equal.

ARM Architecture

CMP R0, [1]
BEQ label_equal

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A#1

B#0

CR1

D#-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a register instead of an immediate value for zero comparison.

The CMP instruction compares R0 with zero using the immediate value #0. The BEQ instruction branches if the comparison shows equality.

2fill in blank

medium

Complete the code to branch to label_greater if R2 is greater than R3.

ARM Architecture

CMP R2, R3
B[1] label_greater

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AGT

BEQ

CLT

DNE

Attempts:

3 left

💡 Hint

Common Mistakes

Using branch conditions for equality or less than instead of greater than.

The BGT instruction branches if the first value is greater than the second after comparison.

3fill in blank

hard

Fix the error in the code to branch if R4 is less than or equal to R5.

ARM Architecture

CMP R4, R5
B[1] label_less_equal

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AGE

BLT

CLE

DGT

Attempts:

3 left

💡 Hint

Common Mistakes

Using LT instead of LE causes the branch to miss the equal case.

The correct branch condition for 'less than or equal' is LE. Using LT only checks for strictly less than.

4fill in blank

hard

Fill both blanks to compare R6 with R7 and branch if not equal.

ARM Architecture

CMP [1], [2]
BNE label_not_equal

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AR6

BR7

C#0

DR0

Attempts:

3 left

💡 Hint

Common Mistakes

Using an immediate value instead of the correct registers for comparison.

The CMP instruction compares register R6 with R7. The BNE instruction branches if they are not equal.

5fill in blank

hard

Fill all three blanks to compare R8 with immediate 5 and branch if greater or equal.

ARM Architecture

CMP [1], [2]
B[3] label_ge

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AR8

B#5

CGE

DLT

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong immediate value or branch condition.

The CMP instruction compares register R8 with immediate value 5. The branch instruction BGE branches if R8 is greater than or equal to 5.