Chapter 5.1, Problem 5.1PP

Program Plan Intro

Given C code:

void swap(long *xp, long *yp)

{

*xp = *xp + *yp;

*yp = *xp - *yp;

*xp = *xp - *yp;

}

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.