EBK COMPUTER SYSTEMS
3rd Edition
ISBN: 8220101459107
Author: O'HALLARON
Publisher: YUZU
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Chapter 5.8, Problem 5.7PP
Program Plan Intro
Given C code:
void combine5(vec_ptr v, data_t *dest)
{
long i;
long length = vec_length(v);
long limit = length – 1;
data_t *data = get_vec_start(v);
data_t acc = IDENT;
for(i=0; i<limit ; i+=2)
{
acc = (acc OP data[i]) OP data[i+1];
}
for(; i<length ; i++)
{
acc = acc OP data[i];
}
*dest = acc;
}
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.
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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EBK COMPUTER SYSTEMS
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