Exercise 4 Loops Consider the following assembly code for a function F4 containi

Question

Exercise 4 Loops Consider the following assembly code for a function F4 containing a loop F4: push EBP mov EBP, ESP # setup stack mov EDX, DWORD PTR [ebp+12] mov ECX, DWORD PTR [ebp+8] xor EAX, EAX mp .L2 dec ECX inc EDX inc EAX #ECX x #EAX ·L1 : ·L2 : cmp ECX, EDX #if # goto .L1 SAL EAX, 3 mov DWORD PTR [EBP-4], EAX mov ESP, EBE # ignore for now # cleanup stack pop EBP ret Complete the C code below corresponding to the assembly code above. You may only use the symbolic variables x, y, and result in your expressions below. Do not use register names int F4 (int x, int y) int result; return result;

Explanation / Answer

Code:-

int F(int x,int y)
{
   int z=5;   //mov     DWORD PTR [ebp-4], 5
   int sum=y;   // mov     eax, DWORD PTR [ebp+8]
   sum=sum+x;   //add     eax, DWORD PTR[ebp+12]
   y=sum;       //mov     DWORD PTR [ebp+8], eax
   sum=z;       // mov     eax, DWORD PTR [ebp-4]       
   y=y-sum;   //sub     DWORD PTR [ebp+8], eax
   sum=y;       //mov     eax, [ebp+8]
   return sum;    //ret
}

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