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 “...