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Rearrange the following code to minimize the total number of cycles, assuming that a dependent instruction following the load will need two clock cycles of delay before getting the data. Load r1, 64 (r2) Add r2, r2, r2 Sub r3, r4, r1 Load r4, 32 (r4)

Rearrange the following code to minimize the total number of cycles, assuming that a dependent instruction following the load will need two clock cycles of delay before getting the data. Load r1, 64 (r2) Add r2, r2, r2 Sub r3, r4, r1 Load r4, 32 (r4)

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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Rearrange the following code to minimize the total number of cycles, assuming that a dependent instruction following the load will need two clock cycles of delay before getting the data.

Load r1, 64 (r2)
Add r2, r2, r2
Sub r3, r4, r1
Load r4, 32 (r4)

**Question 10:** Rearrange the following code to minimize the total number of cycles, assuming that a dependent instruction following the load will need two clock cycles of delay before getting the data. ``` Load r1, 64 (r2) Add r2, r2, r2 Sub r3, r4, r1 Load r4, 32 (r4) ``` **Explanation:** This snippet of assembly code consists of four instructions: 1. **Load r1, 64 (r2):** Loads data from memory (address calculated by adding 64 to the value in register r2) into register r1. 2. **Add r2, r2, r2:** Adds the value in register r2 to itself, storing the result back in r2. 3. **Sub r3, r4, r1:** Subtracts the value in register r1 from the value in register r4, storing the result in r3. 4. **Load r4, 32 (r4):** Loads data from memory (address calculated by adding 32 to the value in register r4) into register r4. To optimize and minimize clock cycles, ensure that operations are arranged to reduce delays, especially after load instructions.
Transcribed Image Text:**Question 10:** Rearrange the following code to minimize the total number of cycles, assuming that a dependent instruction following the load will need two clock cycles of delay before getting the data. ``` Load r1, 64 (r2) Add r2, r2, r2 Sub r3, r4, r1 Load r4, 32 (r4) ``` **Explanation:** This snippet of assembly code consists of four instructions: 1. **Load r1, 64 (r2):** Loads data from memory (address calculated by adding 64 to the value in register r2) into register r1. 2. **Add r2, r2, r2:** Adds the value in register r2 to itself, storing the result back in r2. 3. **Sub r3, r4, r1:** Subtracts the value in register r1 from the value in register r4, storing the result in r3. 4. **Load r4, 32 (r4):** Loads data from memory (address calculated by adding 32 to the value in register r4) into register r4. To optimize and minimize clock cycles, ensure that operations are arranged to reduce delays, especially after load instructions.
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