(1) The following code transposes the elements of an M × M array, where M is a con- stant defined by # define: void transpose(long A[M] [M]) { long i, j; for (i = 0; i < M; i++) for (j = 0; j < i; j++) { long t = A[i] [j] A[j] [i] } A[i] [j]; A[j] [i]; %3D t; } When compiled, with optimization level -01, GCC generates the following code for the inner loop of the function. 1 .L1: (%rdx), (%rax), %rsi, %rcx, $8, %rcx %rsi 2 movq 3 movq (%rdx) (%rax) %rdx 4 movq 5 movq 6 addq addq $120, %rdi, %rax %rax стра jne .L1 We can see that GCC has converted the array indexing to pointer code. (a) Which register holds a pointer to array element A[i] [j]? (b) Which register holds a pointer to array element A[j] [i]? (c) What is the value of M?
(1) The following code transposes the elements of an M × M array, where M is a con- stant defined by # define: void transpose(long A[M] [M]) { long i, j; for (i = 0; i < M; i++) for (j = 0; j < i; j++) { long t = A[i] [j] A[j] [i] } A[i] [j]; A[j] [i]; %3D t; } When compiled, with optimization level -01, GCC generates the following code for the inner loop of the function. 1 .L1: (%rdx), (%rax), %rsi, %rcx, $8, %rcx %rsi 2 movq 3 movq (%rdx) (%rax) %rdx 4 movq 5 movq 6 addq addq $120, %rdi, %rax %rax стра jne .L1 We can see that GCC has converted the array indexing to pointer code. (a) Which register holds a pointer to array element A[i] [j]? (b) Which register holds a pointer to array element A[j] [i]? (c) What is the value of M?
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(1) The following code transposes the elements of an M × M array, where M is a con- stant defined by # define:
void transpose(long A[M][M]) { long i, j;
for (i = 0; i < M; i++)
for (j = 0; j < i; j++) {
} }
When compiled, with optimization level −O1, GCC generates the following code for the inner loop of the function.
1 .L1: 2
3
4
5 6 7 8 9
movq movq movq movq addq addq cmpq jne .L1
(%rdx), %rcx (%rax), %rsi
(%rdx)
(%rax) $8, %rdx $120, %rax %rdi, %rax
%rsi, %rcx,
We can see that GCC has converted the array indexing to pointer code.
(a) Which register holds a pointer to array element A[i][j]? (b) Which register holds a pointer to array element A[j][i]?
(c) What is the value of M?
![(1) The following code transposes the elements of an M × M array, where M is a con-
stant defined by # define:
void transpose(long A [M] [M]) {
long i, j;
for (i = 0; i < M; i++)
for (j
= 0; j < i; j++) {
long t = A[i] [j];
A[i] [j]
A[j] [i]
}
%3D
A[j] [i];
=
t;
}
When compiled, with optimization level -01, GCC generates the following code
for the inner loop of the function.
1 .L1:
(%rdx),
(%rax),
2
movq
%rcx
3
movq
%rsi
%rsi,
%rcx,
$8,
(%rdx)
(%rax)
%rdx
4
movq
5
movq
addq
addq
$120,
%rdi,
%rax
%rax
7
8
стра
9
jne .L1
We can see that GCC has converted the array indexing to pointer code.
(a) Which register holds a pointer to array element A[i] [j]?
(b) Which register holds a pointer to array element A[j] [i]?
(c) What is the value of M?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0fdeee95-83ff-40f3-873c-1fee320ad0c8%2F990baaa5-428b-4968-ade4-164e4583a8c0%2F0ty3om8_processed.png&w=3840&q=75)
Transcribed Image Text:(1) The following code transposes the elements of an M × M array, where M is a con-
stant defined by # define:
void transpose(long A [M] [M]) {
long i, j;
for (i = 0; i < M; i++)
for (j
= 0; j < i; j++) {
long t = A[i] [j];
A[i] [j]
A[j] [i]
}
%3D
A[j] [i];
=
t;
}
When compiled, with optimization level -01, GCC generates the following code
for the inner loop of the function.
1 .L1:
(%rdx),
(%rax),
2
movq
%rcx
3
movq
%rsi
%rsi,
%rcx,
$8,
(%rdx)
(%rax)
%rdx
4
movq
5
movq
addq
addq
$120,
%rdi,
%rax
%rax
7
8
стра
9
jne .L1
We can see that GCC has converted the array indexing to pointer code.
(a) Which register holds a pointer to array element A[i] [j]?
(b) Which register holds a pointer to array element A[j] [i]?
(c) What is the value of M?
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