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`timescale 1ns / 1ps

//////////////////////////////////////////////////////////////////////////////////

// Company: 

// Engineer: 

// 

// Create Date: 2017/01/13 12:53:40

// Design Name: 

// Module Name: bypath

// Project Name: 

// Target Devices: 

// Tool Versions: 

// Description: 

// 

// Dependencies: 

// 

// Revision:

// Revision 0.01 - File Created

// Additional Comments:

// 

//////////////////////////////////////////////////////////////////////////////////

module bypath2(

input wire [31:0]   reg_data,

input wire [31:0]   ex_mem_data,

input wire [31:0]   mem_wb_data,

input wire [31:0]   immediate,

input wire          ALUSrc_flag,

input wire [1:0]    sel,

output wire [31:0]  out

    );

    /* the bypass is a 3-1 MUX */

    assign out = OUT(reg_data, ex_mem_data, mem_wb_data, immediate, ALUSrc_flag, sel);

    function [31:0] OUT;

    input [31:0]    a;

    input [31:0]    b;

    input [31:0]    c;

    input [31:0]    d;

    input           flag;

    input [1:0]     sel;

    begin

       case(  {flag, sel})

        3'b100: OUT = d;

        3'b101: OUT = d;

        3'b110: OUT = d;

        3'b111: OUT = d;

        3'b000: OUT = a;

        3'b010: OUT = b;

        3'b001: OUT = c;

        default: OUT = a;

       endcase

    end

    endfunction

endmodule