学步园

#include <iostream><br /> using namespace std;<br /> void Add()<br /> {<br /> int a, b, r;<br /> cout << "please input two numbers" << endl;<br /> cin>>a;<br /> cin>>b;<br /> cout << "input end" << endl;<br /> int * c = & a;<br /> __asm<br /> {<br /> //<将a, b 移入寄存器eax, ebx><br /> mov eax, c; // 将地址移入eax<br /> mov eax, [eax]; // 将地址中的值移到eax<br /> //mov r, eax; //将寄存器中的内容移到内存r中<br /> mov ebx, b;//可以像这样直接对ebx赋值<br /> lea eax, [eax + ebx];<br /> mov r, eax;<br /> //</将a, b 移入寄存器eax, ebx><br /> }<br /> cout << a << " + "<< b << " = " << r << endl;<br /> }</p> <p>void AddOther()<br /> {<br /> int a, b, r;<br /> cin>>a;<br /> cin>>b;<br /> __asm<br /> {<br /> //add a, b; //不正确的操作数类型<br /> //add ->先移到寄存器中<br /> mov eax, a;<br /> mov ebx, b;<br /> add eax, ebx;<br /> mov r, eax;<br /> }</p> <p> cout << r << endl;<br /> }<br /> void Increase()<br /> {<br /> cout << "start increasing" << endl;<br /> int a;<br /> cin >> a;<br /> __asm<br /> {<br /> inc a;<br /> }<br /> cout << a << endl;<br /> cout << "end" << endl;<br /> }<br /> void Decrease()<br /> {<br /> cout << "start decreasing" << endl;<br /> int a;<br /> cin >> a;<br /> __asm<br /> {<br /> dec a;<br /> }<br /> cout << a << endl;<br /> cout << "end" << endl;<br /> }<br /> void Negtive()<br /> {<br /> cout << "negtive" << endl;<br /> int a;<br /> cin >> a;<br /> __asm<br /> {<br /> neg a;<br /> }<br /> cout << a << endl;<br /> }<br /> void Subtract()<br /> {<br /> cout << "subtract" << endl;<br /> int a, b;<br /> cin >> a;<br /> cin >> b;<br /> _asm<br /> {<br /> mov eax, a;<br /> mov ebx, b;<br /> sub eax, ebx;<br /> mov a, eax;<br /> }<br /> cout << a << endl;<br /> }<br /> void Multiply()<br /> {<br /> cout << "Multiply" << endl;<br /> int a, b;<br /> cin >> a;<br /> cin >> b;<br /> //mul a eax=eax*a, 结果保存在eax中<br /> _asm<br /> {<br /> mov eax, a;<br /> mul b;<br /> mov a, eax;<br /> }<br /> cout << a << endl;<br /> }<br /> void AddTwoNumbers(int* storehere, int number1, int number2)<br /> {<br /> _asm<br /> {<br /> mov eax,dword ptr [number1];<br /> add eax,dword ptr [number2];<br /> mov ecx,dword ptr [storehere];<br /> mov dword ptr [ecx],eax;<br /> }<br /> }<br /> void main( )<br /> {<br /> //Add();<br /> //Increase();<br /> //Decrease();<br /> //Negtive();<br /> //AddOther();<br /> //Subtract();<br /> //Multiply();<br /> int a = 3;<br /> int b = 5;<br /> int r;<br /> AddTwoNumbers(&r, a, b);<br /> cout << r << endl;<br /> system("pause");<br /> }

shl 逻辑左移，右面补零

shl 寄存器(设数值为m)  移动位数n

则寄存器结果为2n m

#include <iostream>
int Power(int num, int power);

int main()
{
	std::cout << Power( 3, 8);
	system("pause");
	return 0;
}

int Power(int num, int power)
{
	//ECX为位寄存器,它的低位为CX，CX又可分为CH和CL
	__asm
	{
		MOV EAX, num ;
			MOV ECX, power //CL为CX的低bit
			SHL EAX, CL
	}
	// 结果保存在EAX中
}