Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
3rd Edition
ISBN: 9780134123837
Author: Randal E. Bryant, David R. O'Hallaron
Publisher: PEARSON
Question
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Chapter 5.9, Problem 5.8PP
Program Plan Intro

Given C code:

double aprod(double a[], long n)

{

long i;

double x, y, z;

double r = 1;

for(i=0; i<n-2; i+=3)

{

x = a[i];

y = a[i + 1];

z = a[i+2];

r = r*x*y*z;

}

for(;i<n ; i++)

r*=a[i];

return r;

}

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.

Memory aliasing:

  • It denotes a case where two pointers might designate to memory location that is same.
  • The compiler should assume that unlike pointers might be aliased for safe optimizations.
  • The program aspects that could limit chances for a compiler in generating optimized code denote optimization blockers.
  • If a compiler is unable to determine whether two pointers might be aliased, it should adopt that either case would be possible.
  • The possible optimization set is been limited in this case.

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