The following code transposes the elements of an M × M array, where M is a constant defi...

The following code transposes the elements of an M × M array, where M is a constant defined by #define:

When compiled with optimization level –O1, GCC generates the following code for the inner loop of the function:

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?