Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Question
Chapter 5.12, Problem 5.11PP
Program Plan Intro
Given Assembly code:
a in %rdi, i in %rax, cnt in %rdx
.L5:
vmovss -4(%rsi, %rax, 4), %xmm0
vaddss (%rdi, %rax, 4), %xmm0, %xmm0
vmovss %xmm0, (%rsi, %rax, 4)
addq $1, %rax
cmpq %rdx, %rax
jne .L5
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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(Q5) COMP
[
PROBLEM # 3:21 I Given the Boolean function F(XYZ) = XY'Z + X'Y'Z +
XYZ
List the truth table. Write the function in SOP summation notation.
• Draw the logic diagram of the original function using 2-input
gates
List the truth table of the simplified function
• Draw the logic diagram of the simplified function (using 2-input
gates)
• Draw the logic diagram of the simplified function using only 2-
input NAND gates
Chapter 5 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
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