Size of int is 4 bytes, Size of pointer to int is 8bytes(64bit machine) QUESTION

Question

Size of int is 4 bytes, Size of pointer to int is 8bytes(64bit machine)

QUESTION 3 The code segment below is to get the value of AliJNI] for an integer array A[NJNM] for some constant values N and M. Assume the address of the array is in %rax, the row is in %rdi and the column is in %rsi lea (%rdi,%rdi,4),%rax lea (%rsi,%rax,41%rax mov (%rax.%rax,41%eax Which of the following statements is true? 0 The array has 20 rows (N-20) The array has 20 columns (M-20) The array has 80 columns (M-80) All of the statements are false The array has 80 rows (N-80)

Explanation / Answer

Solution:

The array has 80 rows.

Explanation:

I am going line by line to explain,

1 rax= rdi + rdi*4=> rax= 5* rdi

rax= rsi + rax * 4

=> rsi + (rax*4)

=> rsi + (rdi*5)*4= rsi + rdi * 20

3 eax= rdx + rdx * 4

= rdx + (rsi + rdi*20)*4

eax= rdx + 4 * rsi + 80 * rdi.

Hence the 80 rows.

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