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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)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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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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