Answer the given question with a proper explanation and step-by-step solution. Solve the assembly question regarding registers written in C code
Answer the given question with a proper explanation and step-by-step solution. Solve the assembly question regarding registers written in C code
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
Related questions
Topic Video
Question
Answer the given question with a proper explanation and step-by-step solution.
Solve the assembly question regarding registers written in C code
![The following is a segment of C code for matrix multiplication C=C+A*B. How many times each matrix element needs
to be accessed/used? How many times each matrix element needs to be loaded-from and stored-to memory?
for (i=0; i<n; i++)
for(j=0; j<n; j++)
for (k=0; k<n; k++)
C[i*n+j]+=A[i*n+k]*B[k*n+j];
The following improved code reduces the number of memory load and stores for matrix C by using a register to
store C[i*n+j]. How many times each matrix element needs to be loaded-from and stored-to memory? Report the
performance of both the original version and this improved version code for matrices of size 1000, 1500, 2000, 2500.
for (i=0; i<n; i++)
}
for (j=0; j<n; j++){
register double t=C[i*n+j];
for (k=0; k<n; k++)
t+=A[i*n+k]*B[k*n+j];
C[i*n+j]=t;
More aggressive optimization can be done by reducing the memory load and store for matrix A, B, and C. Implement
the idea discussed in the last slides of the class lecture, verify the correctness of your implementation by checking
the maximum error in the result matrix C, and compare the performance with the previous two versions.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff7cb6215-048b-47a5-b28f-7c86abf1a0e4%2Fce3e5229-c707-42cc-a87a-ee247e58dee8%2Fn2w539_processed.png&w=3840&q=75)
Transcribed Image Text:The following is a segment of C code for matrix multiplication C=C+A*B. How many times each matrix element needs
to be accessed/used? How many times each matrix element needs to be loaded-from and stored-to memory?
for (i=0; i<n; i++)
for(j=0; j<n; j++)
for (k=0; k<n; k++)
C[i*n+j]+=A[i*n+k]*B[k*n+j];
The following improved code reduces the number of memory load and stores for matrix C by using a register to
store C[i*n+j]. How many times each matrix element needs to be loaded-from and stored-to memory? Report the
performance of both the original version and this improved version code for matrices of size 1000, 1500, 2000, 2500.
for (i=0; i<n; i++)
}
for (j=0; j<n; j++){
register double t=C[i*n+j];
for (k=0; k<n; k++)
t+=A[i*n+k]*B[k*n+j];
C[i*n+j]=t;
More aggressive optimization can be done by reducing the memory load and store for matrix A, B, and C. Implement
the idea discussed in the last slides of the class lecture, verify the correctness of your implementation by checking
the maximum error in the result matrix C, and compare the performance with the previous two versions.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 4 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Recommended textbooks for you
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education