Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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- Write a compare routine to compare two 64-bit values, using only two instructions. (Hint: The second instruction is conditionally executed, based on the first comparison.)
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- In C, both long x and int *y are 8-byte values. How can we can tell which one is which in the assembly compiled from the C? (l.e., what is true of one but not the other? If several answers seem correct, pick the most precise option.) A. x is stored in a register, y in memory B. x is modified using addq, y using addl C. x may be an argument to add but y won't be D. When an argument of mov, a register storing x will never be inside parentheses E. When an argument of mov, a register storing y will always be inside parenthesesarrow_forwardWrite a procedure, BitComplement, which will complement each bit in the contents of the ax register. For example, after the following code fragment is executed: mov ax, 0011010111000001B call BitComplement 0011 0101 1100 0001 B then the contents of the ax register will be 1100101000111110B (1100 1010 0011 1110 B).arrow_forwardUse the following data declarations: .data byte Val word Val sbyte 1, 2, 3, FCh word 1000h, 2000h, 3000h, 4000h dwordVal dword 34567890h, 90785634h, 0Ah, 33445566h Show the value of the final destination operand after each of the following code fragments has executed: (If any instruction/s is invalid, indicate "INV" as the answer and briefly explain why) a. mov bh,byteVal+2 b. mov edx,1 C. add dx,[wordVal+4] mov ecx,5 xchg ecx,[dwordVal+12] d. mov ah, byte Val+3 sub ah,[ byte Val+0] sub ah,[ byte Val +2] e. mov eax, dword ptr dwordVal+7 f. movsx cx,byteVal+3 answer bh= answer edx= answer ecx= answer ah= answer eax= answer (show your answer in binary) CX=arrow_forward
- Use the following data declarations. Assume that the offset of byte Val is 00000000: .data byte Val sbyte 1,2,3.-7h word Val word 1000h.2000h 3000h, 4000h dwordVal dword 34567890h, 90785634h, 1234674Sh Show the value of the final destination operand after each of the following code fragments has executed: (If any instructions is invalid, indicate "INV" as the answer and briefly explain why) a. moy di 2 mov al, byte Val[di] b. mov bx, word Val mov esi, offset wordVal+4 xchg bx, [esi] R c. movsx cx, byte Val+3 d. mov ax, word ptr [dwordVal mov bl. byte ptr [dwordVal +10] e. mov al, 80h number add al 40h signed ;signed number answer al-= answer bx= answer (show your answer in binary) CX- answer |esi= answer bl= SF=arrow_forwardPlease send me answer of this question immediately and i will give you like sure sirarrow_forwardWhich instruction loads ST(0) with an integer?arrow_forward
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