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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Expert Solution & Answer
Chapter 3, Problem 3.69HW
A.
Explanation of Solution
Given assembly code:
# i in %rdi, bp in %rsi
test:
mov 0x120(%rsi), %ecx
add (%rsi), %ecx
lea (%rdi,%rdi,4), %rax
lea (%rsi,%rax,8), %rax
mov 0x8(%rax), %rdx
movslq %ecx, %rcx
mov %rcx, 0x10(%rax,%rdx,8)
retq
Explanation:
- The instruction “mov 0x120(%rsi), %ecx” computes “bp+0x120” and fetches “bp->last”.
- The instruction “add (%rsi), %ecx” performs operation “bp->first + bp->last”.
- The instruction “lea (%rdi,%rdi,4), %rax” performs operation “i*5”.
- The instruction “lea (%rsi,%rax,8), %rax” performs operation “bp +i*40”...
B.
Explanation of Solution
Complete declaration of structure:
typedef struct
{
long idx,
long x[4]
}a_struct
Explanation:
- The struct “...
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Chapter 3 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 3.4 - Prob. 3.1PPCh. 3.4 - Prob. 3.2PPCh. 3.4 - Prob. 3.3PPCh. 3.4 - Prob. 3.4PPCh. 3.4 - Prob. 3.5PPCh. 3.5 - Prob. 3.6PPCh. 3.5 - Prob. 3.7PPCh. 3.5 - Prob. 3.8PPCh. 3.5 - Prob. 3.9PPCh. 3.5 - Prob. 3.10PP
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