int&aa(int&x,int&b);   // Sp Before Byref Func, Sp After Byref Func, Sp Before Byref, Sp After Byref
int aa(int&x,int&)     // Sp Before Byref, Sp Before Unnamed Byref, Sp After Byref
{
	b = aa(x,b);
	c = aa(&y,&d);     // Sp Addr
}