1 2 3 For the following problems, consider the code below: for (i = 0; i...
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1 2 3 For the following problems, consider the code below: for (i = 0; i < 5; i++) { for (j=0; j < 5; j++) A[i+1][j+1] = A[i+1][j−1] + A[i][j-1]; 4 } (a) Draw the iteration space graph for the following piece of code (be careful about the index expressions and the loop order!). (b) What are the distance vectors? The direction vectors? (c) Can the loops be interchanged? Why or why not? (d) Can the following two loops be fused? Why or why not? Explain your answer in terms of dependences between the loops. 1 for (i=1; i < 10; i++) 2 3 4 A[i-1] = B[i+1]; for (i=1; i < 10; i++) A[i+2] = A[i-1]; Activate W Go to Settings 1 2 3 For the following problems, consider the code below: for (i = 0; i < 5; i++) { for (j=0; j < 5; j++) A[i+1][j+1] = A[i+1][j−1] + A[i][j-1]; 4 } (a) Draw the iteration space graph for the following piece of code (be careful about the index expressions and the loop order!). (b) What are the distance vectors? The direction vectors? (c) Can the loops be interchanged? Why or why not? (d) Can the following two loops be fused? Why or why not? Explain your answer in terms of dependences between the loops. 1 for (i=1; i < 10; i++) 2 3 4 A[i-1] = B[i+1]; for (i=1; i < 10; i++) A[i+2] = A[i-1]; Activate W Go to Settings
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Related Book For
Computer Systems A Programmers Perspective
ISBN: 9781292101767
3rd Global Edition
Authors: Randal E. Bryant, David R. O'Hallaron
Posted Date:
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