Q4: your task is to fill in the missing part of the C code to get a program equivalent to the generated assembly code. Recall that the result of the function is returned in register %rax. You will find it helpful to examine the assembly code before, during, and after the loop to form a consistent mapping between the registers and the program variables. A. Which registers hold program values x, n, result, and mask? B. What are the initial values of result and mask? C. What is the test condition for mask? D. How does mask get updated? E. How does result get updated? F. Fill in all the missing parts of the C code. (Problem 3.60 in textbook) loop: movl movl movl jmp .L3: mova anda %esi, %ecx $1, %edx $0, %eax .L2 long loop(long x, long n) long result = _ ; long mask; for (mask = _; mask_; mask = result = ___; %rdi, %r8 %ordx. %r8 %r8, %rax %cl, %rdx ) org return result; salg .L2: testq %rdx, %rdx .L3 rep; ret