/****************************************************
*功能描述:模擬邏輯運算器
*2004-9-11			編寫者:賴衛國
****************************************************/
package cpu;
import	myException.*;

class ALU
{
	private static boolean alu	=	false;
	public ALU()
		throws OnlyOneALUException
	{
		if(!alu)
			alu	=	true;
		else
			throw	new OnlyOneALUException();
	}
	/*******************************************************
	*功能描述:	加法運算(long型和double型)reg1+reg2->reg1
	*參數說明:	reg1:源操作數/目的操作數	reg2:源操作數
	*返回值:	void 
	********************************************************/
	public void ADD(register_data reg1,register_data reg2)
		throws	myException
	{
		String	reg1_s,reg2_s;
		int		point1,point2;
		int		reg1_l,reg2_l,result_l;
		double	reg1_d,reg2_d,result_d;
		reg1_s	=	reg1.getValue().toString();
		reg2_s	=	reg2.getValue().toString();
		point1	=	reg1_s.indexOf(".");
		point2	=	reg2_s.indexOf(".");
		if(point1==-1&&point2==-1)
		{
			reg1_l		=	reg1.get_int();
			reg2_l		=	reg2.get_int();
			result_l	=	reg1_l+reg2_l;
			reg1.setValue(result_l);
		}
		else if (point1!=-1&&point2!=-1)
		{
			reg1_d		=	reg1.get_double();
			reg2_d		=	reg2.get_double();
			result_d	=	reg1_d+reg2_d;
			reg1.setValue(result_d);
		}
		else throw new myException("兩個寄存器的類型不對,不能相加.");
	}
	/*******************************************************
	*功能描述:	減法運算(long型和double型)reg1-reg2->reg1
	*參數說明:	reg1:源操作數/目的操作數	reg2:源操作數
	*返回值:	void 
	********************************************************/
	public void SUB(register_data reg1,register_data reg2)
		throws	myException
	{
		String	reg1_s,reg2_s;
		int		point1,point2;
		int	reg1_l,reg2_l,result_l;
		double	reg1_d,reg2_d,result_d;
		reg1_s	=	reg1.getValue().toString();
		reg2_s	=	reg2.getValue().toString();
		point1	=	reg1_s.indexOf(".");
		point2	=	reg2_s.indexOf(".");
		if(point1==-1&&point2==-1)
		{
			reg1_l		=	reg1.get_int();
			reg2_l		=	reg2.get_int();
			result_l	=	reg1_l-reg2_l;
			reg1.setValue(result_l);
		}
		else if (point1!=-1&&point2!=-1)
		{
			reg1_d		=	reg1.get_double();
			reg2_d		=	reg2.get_double();
			result_d	=	reg1_d-reg2_d;
			reg1.setValue(result_d);
		}
		else throw new myException("兩個寄存器的類型不對,不能相減.");
	}
	/*******************************************************
	*功能描述:	乘法運算(long型和double型)reg1*reg2->reg1
	*參數說明:	reg1:源操作數/目的操作數	reg2:源操作數
	*返回值:	void 
	********************************************************/
	public void MUL(register_data reg1,register_data reg2)
		throws	myException
	{
		String	reg1_s,reg2_s;
		int		point1,point2;
		int		reg1_l,reg2_l,result_l;
		double	reg1_d,reg2_d,result_d;
		reg1_s	=	reg1.getValue().toString();
		reg2_s	=	reg2.getValue().toString();
		point1	=	reg1_s.indexOf(".");
		point2	=	reg2_s.indexOf(".");
		if(point1==-1&&point2==-1)
		{
			reg1_l		=	reg1.get_int();
			reg2_l		=	reg2.get_int();
			result_l	=	reg1_l*reg2_l;
			reg1.setValue(result_l);
		}
		else if (point1!=-1&&point2!=-1)
		{
			reg1_d		=	reg1.get_double();
			reg2_d		=	reg2.get_double();
			result_d	=	reg1_d*reg2_d;
			reg1.setValue(result_d);
		}
		else throw new myException("兩個寄存器的類型不對,不能相減.");
	}
	/*******************************************************
	*功能描述:	除法運算(long型和double型)reg1/reg2->reg3  reg1%reg2->reg4
	*參數說明:	reg1:源操作數	reg2:源操作數	reg3:目的操作數1	reg4:目的操作數2
	*返回值:	void 
	********************************************************/
	public void DIV(register_data reg1,register_data reg2,register_data reg3,register_data reg4)
		throws	myException
	{
		String	reg1_s,reg2_s;
		int		point1,point2;
		int 	reg1_l,reg2_l,result_l,result1_l;
		double	reg1_d,reg2_d,result_d,result1_d;
		reg1_s	=	reg1.getValue().toString();
		reg2_s	=	reg2.getValue().toString();
		point1	=	reg1_s.indexOf(".");
		point2	=	reg2_s.indexOf(".");
		if(point1==-1&&point2==-1)
		{
			reg1_l		=	reg1.get_int();
			reg2_l		=	reg2.get_int();
			result_l	=	reg1_l/reg2_l;
			result1_l	=	reg1_l%reg2_l;
			reg3.setValue(result_l);
			reg4.setValue(result_l);
		}
		else if (point1!=-1&&point2!=-1)
		{
			reg1_d		=	reg1.get_double();
			reg2_d		=	reg2.get_double();
			result_d	=	reg1_d/reg2_d;
			result1_d	=	reg1_d%reg2_d;
			reg3.setValue(result_d);
			reg4.setValue(result1_d);
		}
		else throw new myException("兩個寄存器的類型不對,不能相除.");
	}
};