We can see that gcc has converted the array indexing to pointer code.

Which register holds a pointer to array element A[i][j]?

The following code transposes the elements of an MM array, where M is a constant defined by \#define: When compiled with optimization level-01, Gcc generates the following code for the inner loop of the function: 1.L6: 2 movq (%rdx),%rcx 3 movq (\%rax), \%rsi 456789movqmovqaddqaddq$120,%raxcmpq%rdi,%raxjne.L6%rsi,(%rdx)%rcx,(%rax)$8,%rdx