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

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$For the C code short dw_loop (short x) { short y = x/9; short *p=&x; short do { } n 4*x; = x += y; (*p) += 5;$

1 2 23 4 5 6 7 8 9 10 11 short dw_loop (short x) x initially in /rdi dw_loop: movq movq idivq leaq .L2: %rdi,

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)

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Computer Systems A Programmers Perspective

ISBN: 9781292101767

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Authors: Randal E. Bryant, David R. O'Hallaron

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Question Posted: Nov 06, 2023 10:39 AM

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

Question:

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:

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The code generated when compiling loops can be tricky to analyze because the compiler can perform ma...View the full answer

Computer Systems A Programmers Perspective

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