Show understanding that a set of instructions are grouped

What are instruction groups?

Think of assembly language like a recipe book. Each instruction is a single step, but to make a dish you need to group steps into categories – e.g., prep, cook, serve. In assembly, we group instructions by the type of operation they perform:

• Data movement – moving values between registers and memory.
• Arithmetic & logical – adding, subtracting, AND, OR.
• Control flow – jumps, calls, returns.
• Input/Output – reading from or writing to devices.

Grouping helps programmers understand, optimise, and debug code.

Exam Tip: When you see a list of instructions, quickly identify which group each belongs to. This can help you answer questions about control flow or data movement faster.

Example: If a question asks which instruction will change the program counter, look for JMP, CALL, or RET – all part of the control flow group.

Imagine you’re cooking a meal:

1. Data movement = Gathering ingredients – you pick up spices (registers) and put them in a bowl (memory).
2. Arithmetic & logical = Cooking steps – you stir, chop, or mix (add, subtract).
3. Control flow = Recipe flow – you decide when to add a spice or when to switch from simmering to baking (jumps, calls).
4. Input/Output = Serving the dish – you plate the food and present it to guests (read/write to I/O).

Just as a chef follows a recipe, a programmer follows instruction groups to build a program.

Question: Which instruction group would you use to implement a loop that counts from 1 to 10?

1. Data movement
2. Arithmetic & logical
3. Control flow
4. Input/Output

Answer: Control flow – you need JMP or LOOP to repeat the counting steps.

Remember: All assembly instructions belong to one of four groups. Recognising these groups quickly will help you write efficient code and ace your exams.