What value is in $3 after this executes: ori $3, $0, 0xFFFF O 0x0000FFFF O 0xFFFFFFFF

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### Understanding the MIPS Instruction: ORI
One common question when learning MIPS assembly language is how certain instructions affect the values stored in registers. Let’s break down the given example.

#### Question
**What value is in $3 after this executes:**

```assembly
ori $3, $0, 0xFFFF
```

#### Explanation
Here’s how to analyze this instruction:

1. **Instruction Breakdown:**
   - `ori` stands for "OR Immediate."
   - `$3` is the destination register where the result will be stored.
   - `$0` is the source register, which is always zero in MIPS.
   - `0xFFFF` is the immediate value to be OR-ed with the value in the source register.

2. **Operation:**
   - OR-ing any value with 0xFFFF effectively sets the lower 16 bits of the value to 1 while leaving the upper bits untouched.
   - Since the source register `$0` contains all zeroes (0x00000000), OR-ing this with 0xFFFF gives: 0x00000000 OR 0x0000FFFF = 0x0000FFFF.

3. **Result:**
   - Therefore, the value stored in register `$3` will be `0x0000FFFF`.

#### Multiple Choice Options
To ensure you comprehend, look at the choices below:

- ○ 0x0000FFFF
- ○ 0xFFFFFFFF

Given the explanation, the correct choice is:
- **0x0000FFFF**

Understanding this concept is crucial for mastering MIPS assembly language and manipulating data at the most basic hardware level.
Transcribed Image Text:### Understanding the MIPS Instruction: ORI One common question when learning MIPS assembly language is how certain instructions affect the values stored in registers. Let’s break down the given example. #### Question **What value is in $3 after this executes:** ```assembly ori $3, $0, 0xFFFF ``` #### Explanation Here’s how to analyze this instruction: 1. **Instruction Breakdown:** - `ori` stands for "OR Immediate." - `$3` is the destination register where the result will be stored. - `$0` is the source register, which is always zero in MIPS. - `0xFFFF` is the immediate value to be OR-ed with the value in the source register. 2. **Operation:** - OR-ing any value with 0xFFFF effectively sets the lower 16 bits of the value to 1 while leaving the upper bits untouched. - Since the source register `$0` contains all zeroes (0x00000000), OR-ing this with 0xFFFF gives: 0x00000000 OR 0x0000FFFF = 0x0000FFFF. 3. **Result:** - Therefore, the value stored in register `$3` will be `0x0000FFFF`. #### Multiple Choice Options To ensure you comprehend, look at the choices below: - ○ 0x0000FFFF - ○ 0xFFFFFFFF Given the explanation, the correct choice is: - **0x0000FFFF** Understanding this concept is crucial for mastering MIPS assembly language and manipulating data at the most basic hardware level.
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