What value is in $3 after this executes: ori $3, $0, 0xFFFF O 0x0000FFFF O 0xFFFFFFFF
What value is in $3 after this executes: ori $3, $0, 0xFFFF O 0x0000FFFF O 0xFFFFFFFF
Computer Networking: A Top-Down Approach (7th Edition)
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ISBN:9780133594140
Author:James Kurose, Keith Ross
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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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F37ffeb4c-90e5-4cb9-a6b6-d76475059d8f%2F6511f8ec-8b33-44af-96cb-4acd43433ae1%2Fjf5wjqr_processed.png&w=3840&q=75)
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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