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
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Question
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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Problem 15 (#2.3.30).If f and f◦g are one-to-one, does it follow that g must
be one-to-one? Justify your answer.
3. The diagram below shows the main land routes for vehicular traffic between points A and G in a city. The figures in the arcs represent the cost of traveling between each pair of nodes.
a) Manually apply Dijkstra's algorithm to find the cheapest route between A and G (visited nodes and total distance).
b) Formulate a linear programming problem in extended form, to determine the shortest route to travel from A to G. Do not use subscripts, name 14 variables, for example XFE would be the variable that indicates that the arc from F to E is used.
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FIXED COST
25
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4.1.1
Complete solution and answer only no need explanation
Given three data points (1,6), (3,28), and (10, 231), What is the value of y at x = 2 if the function y = 2x2 + 3x + 1 passes through the three data points.
Chapter 5 Solutions
Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
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