module DECODER_NBUF(instr, instr_25_21, instr_20_16);    input [31:0] instr;    wire [31:0] instr;    output [4:0] instr_25_21;    reg [4:0] instr_25_21;    output [4:0] instr_20_16;    reg [4:0] instr_20_16;    reg [31:0] t_instr;    reg [4:0] t_instr_25_21;    reg [4:0] t_instr_20_16;        always @(instr)        begin : decoder_nbuf_thread            t_instr = instr;            t_instr_25_21 = t_instr[25:21];            t_instr_20_16 = t_instr[20:16];            instr_25_21 = t_instr_25_21;            instr_20_16 = t_instr_20_16;        endendmodule