Assembly & Machine Language
In-class Exercises

Use the "Simple Instruction Set" beneath this Simple CPU Simulator for the following exercises. Recommendation: Bring up the simulator in a separate, side-by-side browser window and scroll down until you find the instruction set for this miniature assembly language.

(Here's a Markdown template for this mini-lab, if you want to use it.)

Write the assembly language instructions to add the contents of memory location 7 to the contents of register 2 and store the results in register 0. Note: Are you allowed to add the contents of a memory location to a register? Or do you need to load the value from memory into another register first? How many instructions will you need to complete this task? By the way, this is clearly just a small program snippet rather than a whole program (since it assumes one value is already in a register and leaves the result in another register), so there is no need to add a HALT instruction.
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High-Level Language ⇒ Assembler: What would be the assembly instructions to do the following computation? (Assume that x and y are in memory locations 6 and 7, respectively.)
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            y = x + y;





        
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Assembler ⇒ High-Level Language: Determine what the following assembly language program fragment does. What would the same program fragment look like in JavaScript or Python? (You may refer to the contents of memory locations 5 and 6 as x and y. It's possible to capture this in a single line of JavaScript or Python.)
```
            LOAD R2 5
            ADD R2 R2 R2
            LOAD R1 6
            ADD R3 R1 R2
            STORE R3 5
            HALT


        
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What would be the assembly instructions to do the following computation? (This notation is neither a high-level language nor assembly language, but sort of a compromise between them.)
```
            R0 = Mem[7] + R2 - R3






        
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(optional) Write the instructions for exercise 1 in machine language (binary).
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Assembly & Machine Language In-class Exercises

Assembly & Machine Language
In-class Exercises