Continuing, write assembly language instructions-not a complete program-that imp

Question

Continuing, write assembly language instructions-not a complete program-that implements line 4 of this C code (where the variables a, b, c, d, w, x, y, and z on line 1 were defined in the data section of Exercise 2). Line 4 requires 13 assembly language instructions, including the instructions that load the addresses and values of the variables into registers and the instruction that writes the result to the memory location allocated to w. For full credit, write a comment for each instruction explaining what the instruction is doing. ~(c | d) is c NOR d.

Explanation / Answer

Answer:

The Line4 in the above instruction i.e w=(a&b)^-(c|d); changed into assembly language code including the loading of addresses instructions is shown as below :

Assembly Code:

0004 8B150000        movl   a(%rip), %edx
000a 8B050000        movl   b(%rip), %eax
0010 89D1        movl   %edx, %ecx
0012 21C1        andl   %eax, %ecx
0014 8B150000        movl   c(%rip), %edx
001a 8B050000        movl   d(%rip), %eax
0020 09D0        orl   %edx, %eax
0022 F7D8        negl   %eax
0024 31C8        xorl   %ecx, %eax
0026 89050000        movl   %eax, w(%rip)
002c B8000000        movl   $0, %eax

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