module ALUControl(funct, aluop, aluctrl);

input[5:0] funct;
input[1:0] aluop;
output reg[3:0] aluctrl;

always @(*) begin
	case(aluop)
		2'b00: aluctrl = 4'b0010;		// add
		2'b01: aluctrl = 4'b0110;		// sub
		2'b10: case(funct)			// R type instruction
			6'b100000: aluctrl = 4'b0010;	//  add
		//	6'b100001: aluctrl = 4'b0010;	//  addu
			6'b100010: aluctrl = 4'b0110;	//  sub
		//	6'b100011: aluctrl = 4'b0110;	//  subu
			6'b100100: aluctrl = 4'b0000;	//  and
			6'b100101: aluctrl = 4'b0001;	//  or
			6'b100110: aluctrl = 4'b1101;	//  xor
			6'b011000: aluctrl = 4'b1000;	//  mult
		//	6'b011001: aluctrl = 4'b1000;	//  multu
			6'b011010: aluctrl = 4'b1001;	//  div
		//	6'b011011: aluctrl = 4'b1001;	//  divu
			6'b101010: aluctrl = 4'b0111;	//  slt
		//	6'b101011: aluctrl = 4'b0111;	//  sltu
			6'b010000: aluctrl = 4'b1010;	//  mfhi
			6'b010010: aluctrl = 4'b1011;	//  mflo

			default: aluctrl = 4'b1111;
			endcase
		default: aluctrl = 4'b1111;
	endcase
end
	
endmodule