module ibex_decoder (
	clk_i,
	rst_ni,
	illegal_insn_o,
	ebrk_insn_o,
	mret_insn_o,
	dret_insn_o,
	ecall_insn_o,
	wfi_insn_o,
	jump_set_o,
	branch_taken_i,
	icache_inval_o,
	instr_first_cycle_i,
	instr_rdata_i,
	instr_rdata_alu_i,
	illegal_c_insn_i,
	imm_a_mux_sel_o,
	imm_b_mux_sel_o,
	bt_a_mux_sel_o,
	bt_b_mux_sel_o,
	imm_i_type_o,
	imm_s_type_o,
	imm_b_type_o,
	imm_u_type_o,
	imm_j_type_o,
	zimm_rs1_type_o,
	rf_wdata_sel_o,
	rf_we_o,
	rf_raddr_a_o,
	rf_raddr_b_o,
	rf_waddr_o,
	rf_ren_a_o,
	rf_ren_b_o,
	alu_operator_o,
	alu_op_a_mux_sel_o,
	alu_op_b_mux_sel_o,
	alu_multicycle_o,
	mult_en_o,
	div_en_o,
	mult_sel_o,
	div_sel_o,
	multdiv_operator_o,
	multdiv_signed_mode_o,
	csr_access_o,
	csr_op_o,
	data_req_o,
	data_we_o,
	data_type_o,
	data_sign_extension_o,
	jump_in_dec_o,
	branch_in_dec_o
);
	parameter [0:0] RV32E = 0;
	parameter integer RV32M = 32'sd2;
	parameter integer RV32B = 32'sd0;
	parameter [0:0] BranchTargetALU = 0;
	input wire clk_i;
	input wire rst_ni;
	output wire illegal_insn_o;
	output reg ebrk_insn_o;
	output reg mret_insn_o;
	output reg dret_insn_o;
	output reg ecall_insn_o;
	output reg wfi_insn_o;
	output reg jump_set_o;
	input wire branch_taken_i;
	output reg icache_inval_o;
	input wire instr_first_cycle_i;
	input wire [31:0] instr_rdata_i;
	input wire [31:0] instr_rdata_alu_i;
	input wire illegal_c_insn_i;
	output reg imm_a_mux_sel_o;
	output reg [2:0] imm_b_mux_sel_o;
	output reg [1:0] bt_a_mux_sel_o;
	output reg [2:0] bt_b_mux_sel_o;
	output wire [31:0] imm_i_type_o;
	output wire [31:0] imm_s_type_o;
	output wire [31:0] imm_b_type_o;
	output wire [31:0] imm_u_type_o;
	output wire [31:0] imm_j_type_o;
	output wire [31:0] zimm_rs1_type_o;
	output reg rf_wdata_sel_o;
	output wire rf_we_o;
	output wire [4:0] rf_raddr_a_o;
	output wire [4:0] rf_raddr_b_o;
	output wire [4:0] rf_waddr_o;
	output reg rf_ren_a_o;
	output reg rf_ren_b_o;
	output reg [5:0] alu_operator_o;
	output reg [1:0] alu_op_a_mux_sel_o;
	output reg alu_op_b_mux_sel_o;
	output reg alu_multicycle_o;
	output wire mult_en_o;
	output wire div_en_o;
	output reg mult_sel_o;
	output reg div_sel_o;
	output reg [1:0] multdiv_operator_o;
	output reg [1:0] multdiv_signed_mode_o;
	output reg csr_access_o;
	output reg [1:0] csr_op_o;
	output reg data_req_o;
	output reg data_we_o;
	output reg [1:0] data_type_o;
	output reg data_sign_extension_o;
	output reg jump_in_dec_o;
	output reg branch_in_dec_o;
	reg illegal_insn;
	wire illegal_reg_rv32e;
	reg csr_illegal;
	reg rf_we;
	wire [31:0] instr;
	wire [31:0] instr_alu;
	wire [9:0] unused_instr_alu;
	wire [4:0] instr_rs1;
	wire [4:0] instr_rs2;
	wire [4:0] instr_rs3;
	wire [4:0] instr_rd;
	reg use_rs3_d;
	reg use_rs3_q;
	reg [1:0] csr_op;
	reg [6:0] opcode;
	reg [6:0] opcode_alu;
	assign instr = instr_rdata_i;
	assign instr_alu = instr_rdata_alu_i;
	assign imm_i_type_o = {{20 {instr[31]}}, instr[31:20]};
	assign imm_s_type_o = {{20 {instr[31]}}, instr[31:25], instr[11:7]};
	assign imm_b_type_o = {{19 {instr[31]}}, instr[31], instr[7], instr[30:25], instr[11:8], 1'b0};
	assign imm_u_type_o = {instr[31:12], 12'b000000000000};
	assign imm_j_type_o = {{12 {instr[31]}}, instr[19:12], instr[20], instr[30:21], 1'b0};
	assign zimm_rs1_type_o = {27'b000000000000000000000000000, instr_rs1};
	generate
		if (RV32B != 32'sd0) begin : gen_rs3_flop
			always @(posedge clk_i or negedge rst_ni)
				if (!rst_ni)
					use_rs3_q <= 1'b0;
				else
					use_rs3_q <= use_rs3_d;
		end
		else begin : gen_no_rs3_flop
			wire unused_clk;
			wire unused_rst_n;
			assign unused_clk = clk_i;
			assign unused_rst_n = rst_ni;
			wire [1:1] sv2v_tmp_44B6F;
			assign sv2v_tmp_44B6F = use_rs3_d;
			always @(*) use_rs3_q = sv2v_tmp_44B6F;
		end
	endgenerate
	assign instr_rs1 = instr[19:15];
	assign instr_rs2 = instr[24:20];
	assign instr_rs3 = instr[31:27];
	assign rf_raddr_a_o = (use_rs3_q & ~instr_first_cycle_i ? instr_rs3 : instr_rs1);
	assign rf_raddr_b_o = instr_rs2;
	assign instr_rd = instr[11:7];
	assign rf_waddr_o = instr_rd;
	generate
		if (RV32E) begin : gen_rv32e_reg_check_active
			assign illegal_reg_rv32e = ((rf_raddr_a_o[4] & (alu_op_a_mux_sel_o == 2'd0)) | (rf_raddr_b_o[4] & (alu_op_b_mux_sel_o == 1'd0))) | (rf_waddr_o[4] & rf_we);
		end
		else begin : gen_rv32e_reg_check_inactive
			assign illegal_reg_rv32e = 1'b0;
		end
	endgenerate
	always @(*) begin : csr_operand_check
		csr_op_o = csr_op;
		if (((csr_op == 2'd2) || (csr_op == 2'd3)) && (instr_rs1 == {5 {1'sb0}}))
			csr_op_o = 2'd0;
	end
	always @(*) begin
		jump_in_dec_o = 1'b0;
		jump_set_o = 1'b0;
		branch_in_dec_o = 1'b0;
		icache_inval_o = 1'b0;
		multdiv_operator_o = 2'd0;
		multdiv_signed_mode_o = 2'b00;
		rf_wdata_sel_o = 1'd0;
		rf_we = 1'b0;
		rf_ren_a_o = 1'b0;
		rf_ren_b_o = 1'b0;
		csr_access_o = 1'b0;
		csr_illegal = 1'b0;
		csr_op = 2'd0;
		data_we_o = 1'b0;
		data_type_o = 2'b00;
		data_sign_extension_o = 1'b0;
		data_req_o = 1'b0;
		illegal_insn = 1'b0;
		ebrk_insn_o = 1'b0;
		mret_insn_o = 1'b0;
		dret_insn_o = 1'b0;
		ecall_insn_o = 1'b0;
		wfi_insn_o = 1'b0;
		opcode = instr[6:0];
		case (opcode)
			7'h6f: begin
				jump_in_dec_o = 1'b1;
				if (instr_first_cycle_i) begin
					rf_we = BranchTargetALU;
					jump_set_o = 1'b1;
				end
				else
					rf_we = 1'b1;
			end
			7'h67: begin
				jump_in_dec_o = 1'b1;
				if (instr_first_cycle_i) begin
					rf_we = BranchTargetALU;
					jump_set_o = 1'b1;
				end
				else
					rf_we = 1'b1;
				if (instr[14:12] != 3'b000)
					illegal_insn = 1'b1;
				rf_ren_a_o = 1'b1;
			end
			7'h63: begin
				branch_in_dec_o = 1'b1;
				case (instr[14:12])
					3'b000, 3'b001, 3'b100, 3'b101, 3'b110, 3'b111: illegal_insn = 1'b0;
					default: illegal_insn = 1'b1;
				endcase
				rf_ren_a_o = 1'b1;
				rf_ren_b_o = 1'b1;
			end
			7'h23: begin
				rf_ren_a_o = 1'b1;
				rf_ren_b_o = 1'b1;
				data_req_o = 1'b1;
				data_we_o = 1'b1;
				if (instr[14])
					illegal_insn = 1'b1;
				case (instr[13:12])
					2'b00: data_type_o = 2'b10;
					2'b01: data_type_o = 2'b01;
					2'b10: data_type_o = 2'b00;
					default: illegal_insn = 1'b1;
				endcase
			end
			7'h03: begin
				rf_ren_a_o = 1'b1;
				data_req_o = 1'b1;
				data_type_o = 2'b00;
				data_sign_extension_o = ~instr[14];
				case (instr[13:12])
					2'b00: data_type_o = 2'b10;
					2'b01: data_type_o = 2'b01;
					2'b10: begin
						data_type_o = 2'b00;
						if (instr[14])
							illegal_insn = 1'b1;
					end
					default: illegal_insn = 1'b1;
				endcase
			end
			7'h37: rf_we = 1'b1;
			7'h17: rf_we = 1'b1;
			7'h13: begin
				rf_ren_a_o = 1'b1;
				rf_we = 1'b1;
				case (instr[14:12])
					3'b000, 3'b010, 3'b011, 3'b100, 3'b110, 3'b111: illegal_insn = 1'b0;
					3'b001:
						case (instr[31:27])
							5'b00000: illegal_insn = (instr[26:25] == 2'b00 ? 1'b0 : 1'b1);
							5'b00100, 5'b01001, 5'b00101, 5'b01101: illegal_insn = (RV32B != 32'sd0 ? 1'b0 : 1'b1);
							5'b00001:
								if (instr[26] == 1'b0)
									illegal_insn = (RV32B == 32'sd2 ? 1'b0 : 1'b1);
								else
									illegal_insn = 1'b1;
							5'b01100:
								case (instr[26:20])
									7'b0000000, 7'b0000001, 7'b0000010, 7'b0000100, 7'b0000101: illegal_insn = (RV32B != 32'sd0 ? 1'b0 : 1'b1);
									7'b0010000, 7'b0010001, 7'b0010010, 7'b0011000, 7'b0011001, 7'b0011010: illegal_insn = (RV32B == 32'sd2 ? 1'b0 : 1'b1);
									default: illegal_insn = 1'b1;
								endcase
							default: illegal_insn = 1'b1;
						endcase
					3'b101:
						if (instr[26])
							illegal_insn = (RV32B != 32'sd0 ? 1'b0 : 1'b1);
						else
							case (instr[31:27])
								5'b00000, 5'b01000: illegal_insn = (instr[26:25] == 2'b00 ? 1'b0 : 1'b1);
								5'b00100, 5'b01100, 5'b01001: illegal_insn = (RV32B != 32'sd0 ? 1'b0 : 1'b1);
								5'b01101:
									if (RV32B == 32'sd2)
										illegal_insn = 1'b0;
									else
										case (instr[24:20])
											5'b11111, 5'b11000: illegal_insn = (RV32B == 32'sd1 ? 1'b0 : 1'b1);
											default: illegal_insn = 1'b1;
										endcase
								5'b00101:
									if (RV32B == 32'sd2)
										illegal_insn = 1'b0;
									else if (instr[24:20] == 5'b00111)
										illegal_insn = (RV32B == 32'sd1 ? 1'b0 : 1'b1);
									else
										illegal_insn = 1'b1;
								5'b00001:
									if (instr[26] == 1'b0)
										illegal_insn = (RV32B == 32'sd2 ? 1'b0 : 1'b1);
									else
										illegal_insn = 1'b1;
								default: illegal_insn = 1'b1;
							endcase
					default: illegal_insn = 1'b1;
				endcase
			end
			7'h33: begin
				rf_ren_a_o = 1'b1;
				rf_ren_b_o = 1'b1;
				rf_we = 1'b1;
				if ({instr[26], instr[13:12]} == 3'b101)
					illegal_insn = (RV32B != 32'sd0 ? 1'b0 : 1'b1);
				else
					case ({instr[31:25], instr[14:12]})
						10'b0000000000, 10'b0100000000, 10'b0000000010, 10'b0000000011, 10'b0000000100, 10'b0000000110, 10'b0000000111, 10'b0000000001, 10'b0000000101, 10'b0100000101: illegal_insn = 1'b0;
						10'b0100000111, 10'b0100000110, 10'b0100000100, 10'b0010000001, 10'b0010000101, 10'b0110000001, 10'b0110000101, 10'b0000101100, 10'b0000101101, 10'b0000101110, 10'b0000101111, 10'b0000100100, 10'b0100100100, 10'b0000100111, 10'b0100100001, 10'b0010100001, 10'b0110100001, 10'b0100100101, 10'b0100100111: illegal_insn = (RV32B != 32'sd0 ? 1'b0 : 1'b1);
						10'b0100100110, 10'b0000100110, 10'b0110100101, 10'b0010100101, 10'b0000100001, 10'b0000100101, 10'b0000101001, 10'b0000101010, 10'b0000101011: illegal_insn = (RV32B == 32'sd2 ? 1'b0 : 1'b1);
						10'b0000001000: begin
							multdiv_operator_o = 2'd0;
							multdiv_signed_mode_o = 2'b00;
							illegal_insn = (RV32M == 32'sd0 ? 1'b1 : 1'b0);
						end
						10'b0000001001: begin
							multdiv_operator_o = 2'd1;
							multdiv_signed_mode_o = 2'b11;
							illegal_insn = (RV32M == 32'sd0 ? 1'b1 : 1'b0);
						end
						10'b0000001010: begin
							multdiv_operator_o = 2'd1;
							multdiv_signed_mode_o = 2'b01;
							illegal_insn = (RV32M == 32'sd0 ? 1'b1 : 1'b0);
						end
						10'b0000001011: begin
							multdiv_operator_o = 2'd1;
							multdiv_signed_mode_o = 2'b00;
							illegal_insn = (RV32M == 32'sd0 ? 1'b1 : 1'b0);
						end
						10'b0000001100: begin
							multdiv_operator_o = 2'd2;
							multdiv_signed_mode_o = 2'b11;
							illegal_insn = (RV32M == 32'sd0 ? 1'b1 : 1'b0);
						end
						10'b0000001101: begin
							multdiv_operator_o = 2'd2;
							multdiv_signed_mode_o = 2'b00;
							illegal_insn = (RV32M == 32'sd0 ? 1'b1 : 1'b0);
						end
						10'b0000001110: begin
							multdiv_operator_o = 2'd3;
							multdiv_signed_mode_o = 2'b11;
							illegal_insn = (RV32M == 32'sd0 ? 1'b1 : 1'b0);
						end
						10'b0000001111: begin
							multdiv_operator_o = 2'd3;
							multdiv_signed_mode_o = 2'b00;
							illegal_insn = (RV32M == 32'sd0 ? 1'b1 : 1'b0);
						end
						default: illegal_insn = 1'b1;
					endcase
			end
			7'h0f:
				case (instr[14:12])
					3'b000: rf_we = 1'b0;
					3'b001: begin
						jump_in_dec_o = 1'b1;
						rf_we = 1'b0;
						if (instr_first_cycle_i) begin
							jump_set_o = 1'b1;
							icache_inval_o = 1'b1;
						end
					end
					default: illegal_insn = 1'b1;
				endcase
			7'h73:
				if (instr[14:12] == 3'b000) begin
					case (instr[31:20])
						12'h000: ecall_insn_o = 1'b1;
						12'h001: ebrk_insn_o = 1'b1;
						12'h302: mret_insn_o = 1'b1;
						12'h7b2: dret_insn_o = 1'b1;
						12'h105: wfi_insn_o = 1'b1;
						default: illegal_insn = 1'b1;
					endcase
					if ((instr_rs1 != 5'b00000) || (instr_rd != 5'b00000))
						illegal_insn = 1'b1;
				end
				else begin
					csr_access_o = 1'b1;
					rf_wdata_sel_o = 1'd1;
					rf_we = 1'b1;
					if (~instr[14])
						rf_ren_a_o = 1'b1;
					case (instr[13:12])
						2'b01: csr_op = 2'd1;
						2'b10: csr_op = 2'd2;
						2'b11: csr_op = 2'd3;
						default: csr_illegal = 1'b1;
					endcase
					illegal_insn = csr_illegal;
				end
			default: illegal_insn = 1'b1;
		endcase
		if (illegal_c_insn_i)
			illegal_insn = 1'b1;
		if (illegal_insn) begin
			rf_we = 1'b0;
			data_req_o = 1'b0;
			data_we_o = 1'b0;
			jump_in_dec_o = 1'b0;
			jump_set_o = 1'b0;
			branch_in_dec_o = 1'b0;
			csr_access_o = 1'b0;
		end
	end
	always @(*) begin
		alu_operator_o = 6'd38;
		alu_op_a_mux_sel_o = 2'd3;
		alu_op_b_mux_sel_o = 1'd1;
		imm_a_mux_sel_o = 1'd1;
		imm_b_mux_sel_o = 3'd0;
		bt_a_mux_sel_o = 2'd2;
		bt_b_mux_sel_o = 3'd0;
		opcode_alu = instr_alu[6:0];
		use_rs3_d = 1'b0;
		alu_multicycle_o = 1'b0;
		mult_sel_o = 1'b0;
		div_sel_o = 1'b0;
		case (opcode_alu)
			7'h6f: begin
				if (BranchTargetALU) begin
					bt_a_mux_sel_o = 2'd2;
					bt_b_mux_sel_o = 3'd4;
				end
				if (instr_first_cycle_i && !BranchTargetALU) begin
					alu_op_a_mux_sel_o = 2'd2;
					alu_op_b_mux_sel_o = 1'd1;
					imm_b_mux_sel_o = 3'd4;
					alu_operator_o = 6'd0;
				end
				else begin
					alu_op_a_mux_sel_o = 2'd2;
					alu_op_b_mux_sel_o = 1'd1;
					imm_b_mux_sel_o = 3'd5;
					alu_operator_o = 6'd0;
				end
			end
			7'h67: begin
				if (BranchTargetALU) begin
					bt_a_mux_sel_o = 2'd0;
					bt_b_mux_sel_o = 3'd0;
				end
				if (instr_first_cycle_i && !BranchTargetALU) begin
					alu_op_a_mux_sel_o = 2'd0;
					alu_op_b_mux_sel_o = 1'd1;
					imm_b_mux_sel_o = 3'd0;
					alu_operator_o = 6'd0;
				end
				else begin
					alu_op_a_mux_sel_o = 2'd2;
					alu_op_b_mux_sel_o = 1'd1;
					imm_b_mux_sel_o = 3'd5;
					alu_operator_o = 6'd0;
				end
			end
			7'h63: begin
				case (instr_alu[14:12])
					3'b000: alu_operator_o = 6'd23;
					3'b001: alu_operator_o = 6'd24;
					3'b100: alu_operator_o = 6'd19;
					3'b101: alu_operator_o = 6'd21;
					3'b110: alu_operator_o = 6'd20;
					3'b111: alu_operator_o = 6'd22;
					default:
						;
				endcase
				if (BranchTargetALU) begin
					bt_a_mux_sel_o = 2'd2;
					bt_b_mux_sel_o = (branch_taken_i ? 3'd2 : 3'd5);
				end
				if (instr_first_cycle_i) begin
					alu_op_a_mux_sel_o = 2'd0;
					alu_op_b_mux_sel_o = 1'd0;
				end
				else if (!BranchTargetALU) begin
					alu_op_a_mux_sel_o = 2'd2;
					alu_op_b_mux_sel_o = 1'd1;
					imm_b_mux_sel_o = (branch_taken_i ? 3'd2 : 3'd5);
					alu_operator_o = 6'd0;
				end
			end
			7'h23: begin
				alu_op_a_mux_sel_o = 2'd0;
				alu_op_b_mux_sel_o = 1'd0;
				alu_operator_o = 6'd0;
				if (!instr_alu[14]) begin
					imm_b_mux_sel_o = 3'd1;
					alu_op_b_mux_sel_o = 1'd1;
				end
			end
			7'h03: begin
				alu_op_a_mux_sel_o = 2'd0;
				alu_operator_o = 6'd0;
				alu_op_b_mux_sel_o = 1'd1;
				imm_b_mux_sel_o = 3'd0;
			end
			7'h37: begin
				alu_op_a_mux_sel_o = 2'd3;
				alu_op_b_mux_sel_o = 1'd1;
				imm_a_mux_sel_o = 1'd1;
				imm_b_mux_sel_o = 3'd3;
				alu_operator_o = 6'd0;
			end
			7'h17: begin
				alu_op_a_mux_sel_o = 2'd2;
				alu_op_b_mux_sel_o = 1'd1;
				imm_b_mux_sel_o = 3'd3;
				alu_operator_o = 6'd0;
			end
			7'h13: begin
				alu_op_a_mux_sel_o = 2'd0;
				alu_op_b_mux_sel_o = 1'd1;
				imm_b_mux_sel_o = 3'd0;
				case (instr_alu[14:12])
					3'b000: alu_operator_o = 6'd0;
					3'b010: alu_operator_o = 6'd37;
					3'b011: alu_operator_o = 6'd38;
					3'b100: alu_operator_o = 6'd2;
					3'b110: alu_operator_o = 6'd3;
					3'b111: alu_operator_o = 6'd4;
					3'b001:
						if (RV32B != 32'sd0)
							case (instr_alu[31:27])
								5'b00000: alu_operator_o = 6'd10;
								5'b00100: alu_operator_o = 6'd12;
								5'b01001: alu_operator_o = 6'd44;
								5'b00101: alu_operator_o = 6'd43;
								5'b01101: alu_operator_o = 6'd45;
								5'b00001:
									if (instr_alu[26] == 0)
										alu_operator_o = 6'd17;
								5'b01100:
									case (instr_alu[26:20])
										7'b0000000: alu_operator_o = 6'd34;
										7'b0000001: alu_operator_o = 6'd35;
										7'b0000010: alu_operator_o = 6'd36;
										7'b0000100: alu_operator_o = 6'd32;
										7'b0000101: alu_operator_o = 6'd33;
										7'b0010000:
											if (RV32B == 32'sd2) begin
												alu_operator_o = 6'd53;
												alu_multicycle_o = 1'b1;
											end
										7'b0010001:
											if (RV32B == 32'sd2) begin
												alu_operator_o = 6'd55;
												alu_multicycle_o = 1'b1;
											end
										7'b0010010:
											if (RV32B == 32'sd2) begin
												alu_operator_o = 6'd57;
												alu_multicycle_o = 1'b1;
											end
										7'b0011000:
											if (RV32B == 32'sd2) begin
												alu_operator_o = 6'd54;
												alu_multicycle_o = 1'b1;
											end
										7'b0011001:
											if (RV32B == 32'sd2) begin
												alu_operator_o = 6'd56;
												alu_multicycle_o = 1'b1;
											end
										7'b0011010:
											if (RV32B == 32'sd2) begin
												alu_operator_o = 6'd58;
												alu_multicycle_o = 1'b1;
											end
										default:
											;
									endcase
								default:
									;
							endcase
						else
							alu_operator_o = 6'd10;
					3'b101:
						if (RV32B != 32'sd0) begin
							if (instr_alu[26] == 1'b1) begin
								alu_operator_o = 6'd42;
								alu_multicycle_o = 1'b1;
								if (instr_first_cycle_i)
									use_rs3_d = 1'b1;
								else
									use_rs3_d = 1'b0;
							end
							else
								case (instr_alu[31:27])
									5'b00000: alu_operator_o = 6'd9;
									5'b01000: alu_operator_o = 6'd8;
									5'b00100: alu_operator_o = 6'd11;
									5'b01001: alu_operator_o = 6'd46;
									5'b01100: begin
										alu_operator_o = 6'd13;
										alu_multicycle_o = 1'b1;
									end
									5'b01101: alu_operator_o = 6'd15;
									5'b00101: alu_operator_o = 6'd16;
									5'b00001:
										if (RV32B == 32'sd2)
											if (instr_alu[26] == 1'b0)
												alu_operator_o = 6'd18;
									default:
										;
								endcase
						end
						else if (instr_alu[31:27] == 5'b00000)
							alu_operator_o = 6'd9;
						else if (instr_alu[31:27] == 5'b01000)
							alu_operator_o = 6'd8;
					default:
						;
				endcase
			end
			7'h33: begin
				alu_op_a_mux_sel_o = 2'd0;
				alu_op_b_mux_sel_o = 1'd0;
				if (instr_alu[26]) begin
					if (RV32B != 32'sd0)
						case ({instr_alu[26:25], instr_alu[14:12]})
							5'b11001: begin
								alu_operator_o = 6'd40;
								alu_multicycle_o = 1'b1;
								if (instr_first_cycle_i)
									use_rs3_d = 1'b1;
								else
									use_rs3_d = 1'b0;
							end
							5'b11101: begin
								alu_operator_o = 6'd39;
								alu_multicycle_o = 1'b1;
								if (instr_first_cycle_i)
									use_rs3_d = 1'b1;
								else
									use_rs3_d = 1'b0;
							end
							5'b10001: begin
								alu_operator_o = 6'd41;
								alu_multicycle_o = 1'b1;
								if (instr_first_cycle_i)
									use_rs3_d = 1'b1;
								else
									use_rs3_d = 1'b0;
							end
							5'b10101: begin
								alu_operator_o = 6'd42;
								alu_multicycle_o = 1'b1;
								if (instr_first_cycle_i)
									use_rs3_d = 1'b1;
								else
									use_rs3_d = 1'b0;
							end
							default:
								;
						endcase
				end
				else
					case ({instr_alu[31:25], instr_alu[14:12]})
						10'b0000000000: alu_operator_o = 6'd0;
						10'b0100000000: alu_operator_o = 6'd1;
						10'b0000000010: alu_operator_o = 6'd37;
						10'b0000000011: alu_operator_o = 6'd38;
						10'b0000000100: alu_operator_o = 6'd2;
						10'b0000000110: alu_operator_o = 6'd3;
						10'b0000000111: alu_operator_o = 6'd4;
						10'b0000000001: alu_operator_o = 6'd10;
						10'b0000000101: alu_operator_o = 6'd9;
						10'b0100000101: alu_operator_o = 6'd8;
						10'b0010000001:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd12;
						10'b0010000101:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd11;
						10'b0110000001:
							if (RV32B != 32'sd0) begin
								alu_operator_o = 6'd14;
								alu_multicycle_o = 1'b1;
							end
						10'b0110000101:
							if (RV32B != 32'sd0) begin
								alu_operator_o = 6'd13;
								alu_multicycle_o = 1'b1;
							end
						10'b0000101100:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd25;
						10'b0000101101:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd27;
						10'b0000101110:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd26;
						10'b0000101111:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd28;
						10'b0000100100:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd29;
						10'b0100100100:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd30;
						10'b0000100111:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd31;
						10'b0100000100:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd5;
						10'b0100000110:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd6;
						10'b0100000111:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd7;
						10'b0100100001:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd44;
						10'b0010100001:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd43;
						10'b0110100001:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd45;
						10'b0100100101:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd46;
						10'b0100100111:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd49;
						10'b0110100101:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd15;
						10'b0010100101:
							if (RV32B != 32'sd0)
								alu_operator_o = 6'd16;
						10'b0000100001:
							if (RV32B == 32'sd2)
								alu_operator_o = 6'd17;
						10'b0000100101:
							if (RV32B == 32'sd2)
								alu_operator_o = 6'd18;
						10'b0000101001:
							if (RV32B == 32'sd2)
								alu_operator_o = 6'd50;
						10'b0000101010:
							if (RV32B == 32'sd2)
								alu_operator_o = 6'd51;
						10'b0000101011:
							if (RV32B == 32'sd2)
								alu_operator_o = 6'd52;
						10'b0100100110:
							if (RV32B == 32'sd2) begin
								alu_operator_o = 6'd48;
								alu_multicycle_o = 1'b1;
							end
						10'b0000100110:
							if (RV32B == 32'sd2) begin
								alu_operator_o = 6'd47;
								alu_multicycle_o = 1'b1;
							end
						10'b0000001000: begin
							alu_operator_o = 6'd0;
							mult_sel_o = (RV32M == 32'sd0 ? 1'b0 : 1'b1);
						end
						10'b0000001001: begin
							alu_operator_o = 6'd0;
							mult_sel_o = (RV32M == 32'sd0 ? 1'b0 : 1'b1);
						end
						10'b0000001010: begin
							alu_operator_o = 6'd0;
							mult_sel_o = (RV32M == 32'sd0 ? 1'b0 : 1'b1);
						end
						10'b0000001011: begin
							alu_operator_o = 6'd0;
							mult_sel_o = (RV32M == 32'sd0 ? 1'b0 : 1'b1);
						end
						10'b0000001100: begin
							alu_operator_o = 6'd0;
							div_sel_o = (RV32M == 32'sd0 ? 1'b0 : 1'b1);
						end
						10'b0000001101: begin
							alu_operator_o = 6'd0;
							div_sel_o = (RV32M == 32'sd0 ? 1'b0 : 1'b1);
						end
						10'b0000001110: begin
							alu_operator_o = 6'd0;
							div_sel_o = (RV32M == 32'sd0 ? 1'b0 : 1'b1);
						end
						10'b0000001111: begin
							alu_operator_o = 6'd0;
							div_sel_o = (RV32M == 32'sd0 ? 1'b0 : 1'b1);
						end
						default:
							;
					endcase
			end
			7'h0f:
				case (instr_alu[14:12])
					3'b000: begin
						alu_operator_o = 6'd0;
						alu_op_a_mux_sel_o = 2'd0;
						alu_op_b_mux_sel_o = 1'd1;
					end
					3'b001:
						if (BranchTargetALU) begin
							bt_a_mux_sel_o = 2'd2;
							bt_b_mux_sel_o = 3'd5;
						end
						else begin
							alu_op_a_mux_sel_o = 2'd2;
							alu_op_b_mux_sel_o = 1'd1;
							imm_b_mux_sel_o = 3'd5;
							alu_operator_o = 6'd0;
						end
					default:
						;
				endcase
			7'h73:
				if (instr_alu[14:12] == 3'b000) begin
					alu_op_a_mux_sel_o = 2'd0;
					alu_op_b_mux_sel_o = 1'd1;
				end
				else begin
					alu_op_b_mux_sel_o = 1'd1;
					imm_a_mux_sel_o = 1'd0;
					imm_b_mux_sel_o = 3'd0;
					if (instr_alu[14])
						alu_op_a_mux_sel_o = 2'd3;
					else
						alu_op_a_mux_sel_o = 2'd0;
				end
			default:
				;
		endcase
	end
	assign mult_en_o = (illegal_insn ? 1'b0 : mult_sel_o);
	assign div_en_o = (illegal_insn ? 1'b0 : div_sel_o);
	assign illegal_insn_o = illegal_insn | illegal_reg_rv32e;
	assign rf_we_o = rf_we & ~illegal_reg_rv32e;
	assign unused_instr_alu = {instr_alu[19:15], instr_alu[11:7]};
endmodule