A. Which registers are used to hold program values x, y, and n?

B. How has the compiler eliminated the need for pointer variable p and the pointer dereferencing implied by the expression (*p)+=5?

C. Add annotations to the assembly code describing the operation of the program, similar to those shown in Figure 3.19(c).

Figure 3.19(c) 

For the C code short dw_loop (short x) { short y = x/9; short *p=&x; short do { } n 4*x; = x += y; (*p) += 5; n = 2; while (n > 0); return x; GCC generates the following assembly code: