// template.cpp : Defines the entry point for the console application. // #inclu

Question

// template.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"


int _tmain(int argc, _TCHAR* argv[])
{
__asm
{
//1) Place 7 in the EAX register, place 5 in EBX, add the two numbers together, and have the result go into the EAX register

//2) Place 4 in the EAX register, shift the bits left 3 times, with the result in the EAX register

//3) Loop 3 times, using the fewest number of instructions that you can.

//4) Push the 32bit value 6 on the stack, then pop it off the stack into the EAX register

//5) Place 2 in the AX register, compare AX to the number 5, do a conditional branch (jump) if AX is greater than or equal to 5

}

return 0;
}

Explanation / Answer

//1) Place 7 in the EAX register, place 5 in EBX, add the two numbers together, and have the result go into the EAX register

mov EAX, 7;

mov EBX , 5;

add EAX, EBX;


//2) Place 4 in the EAX register, shift the bits left 3 times, with the result in the EAX register
mov EAX, 4;

shl EAX, 3

//3) Loop 3 times, using the fewest number of instructions that you can.

// one way to do this is as follows

mov ECX , 3;

start:  

loop start; // loop repeats ECX times

// other way is as follows

 
mov ECX, 3;

start:

dec ECX, 1;

jnz start;



//4) Push the 32bit value 6 on the stack, then pop it off the stack into the EAX register
mov EBX, 0xFFFFFFFF ;
push EBX;
pop EAX;


//5) Place 2 in the AX register, compare AX to the number 5, do a conditional branch (jump) if AX is greater than or equal to 5

mov ax, 2;

cmp ax, 5;

jge LABEL; // This jump is taken after a CMP if the signed destination is larger than

                 //or equal to the signed source
LABEL:

 

Hope this helps...

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