设计一个32位ALU支持加法、减法、与、或、异或、取非这六中运算

设计一个32位ALU支持加法、减法、与、或、异或、取非这六中运算

Design a 32-bit ALU to support six operations including addition, subtraction, and, or, xor, not.

module ALU_32(
	input [31:0] data_a_in,
	input [31:0] data_b_in,
	input carry_in,
	input [3:0] op_code,
	output reg carry_out,
	output reg [31:0] result_out
);
	localparam	ADD = 0, SUB = 1, AND = 2, OR = 3, XOR = 4, NONA = 5, NONB = 6;
	always @ (op_code or data_a_in or data_b_in)
		case(op_code)
			ADD	:	{carry_out,result_out} <= data_a_in + data_b_in + carry_in;
			SUB	:	{carry_out,result_out} <= {data_a_in[31],data_a_in} - {data_b_in[31],data_b_in} - carry_in;
			AND	:	result_out <= data_a_in & data_b_in;
			OR		:	result_out <= data_a_in | data_b_in;			
			XOR	:	result_out <= data_a_in ^ data_b_in;
			NONA	:	result_out <= ~data_a_in;
			NONB	:	result_out <= ~data_b_in;
			default	:	result_out <= data_a_in;
		endcase
endmodule