IT block for conditional execution (Thumb-2) in ARM Architecture - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start an IT block that executes the next instruction if equal.

ARM Architecture

IT [1]

Drag options to blanks, or click blank then click option'

AGT

BNE

CEQ

DLT

Attempts:

3 left

💡 Hint

Common Mistakes

Using NE instead of EQ, which means not equal.

The IT instruction starts a conditional block. 'EQ' means execute if equal (zero flag set).

2fill in blank

medium

Complete the IT block to execute two instructions if greater than.

ARM Architecture

IT [1]T

Drag options to blanks, or click blank then click option'

AGT

BLE

CEQ

DNE

Attempts:

3 left

💡 Hint

Common Mistakes

Using LE which means less or equal, not greater than.

'GT' means greater than. 'T' means the next instruction is also conditional.

3fill in blank

hard

Fix the error in the IT block that should execute three instructions if less or equal.

ARM Architecture

IT [1]TT

Drag options to blanks, or click blank then click option'

AEQ

BGE

CNE

DLE

Attempts:

3 left

💡 Hint

Common Mistakes

Using GE which means greater or equal, not less or equal.

'LE' means less or equal. 'TT' means the next two instructions are conditional.

4fill in blank

hard

Fill both blanks to create an IT block that executes four instructions if not equal.

ARM Architecture

IT [1][2]T

Drag options to blanks, or click blank then click option'

ANE

BEQ

CT

DE

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'EQ' instead of 'NE' for not equal condition.

'NE' means not equal. 'T' after condition means next instruction is conditional. 'TT' means three instructions total, so 'TTT' means four instructions total. Here, 'TC' is not valid; the correct suffix to extend to four instructions is 'TT'.

5fill in blank

hard

Fill all three blanks to create an IT block that executes three instructions if greater or equal.

ARM Architecture

IT [1][2][3]

Drag options to blanks, or click blank then click option'

AGE

BT

CE

DN

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'E' or 'N' which are not valid condition codes here.

'GE' means greater or equal. Two 'T's after condition mean the next two instructions are conditional, so three instructions total.