COMPUTER SYSTEMS&MOD MSGT/ET SA AC PKG
3rd Edition
ISBN: 9780134671123
Author: Bryant
Publisher: PEARSON
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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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Chapter 5 Solutions
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