Computer Systems: A Programmer's Perspective (3rd Edition)
Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 5, Problem 5.16HW
Program Plan Intro

Given C Code:

void inner4(vec_ptr u, vec_ptr v, data_t *dest)

{

long i;

long length = vec_length(u);

data_t *udata = get_vec_start(u);

data_t *vdata = get_vec_start(v);

data_t sum = (data_t) 0;

for (i = 0; i < length; i++)

{

sum = sum + udata[i] * vdata[i];

}

*dest = sum;

}

Cycles per element (CPE):

  • The CPE denotes performance of program that helps in improving code.
  • It helps to understand detailed level loop performance for an iterative program.
  • It is appropriate for programs that use a repetitive computation.
  • The processor’s activity sequencing is controlled by a clock that provides regular signal of some frequency.

Loop unrolling:

  • It denotes a program transformation that would reduce count of iterations for a loop.
  • It increases count of elements computed in each iteration.
  • It reduces number of operations that is not dependent to program directly.
  • It reduces count of operations in critical paths of overall computations.

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