Prompt:
module top_module (
	input clk,
	input [7:0] in,
	input reset,
	output done
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input [7:0] in,
	input reset,
	output done
);
	parameter BYTE1=0, BYTE2=1, BYTE3=2, DONE=3;
	reg [1:0] state;
	reg [1:0] next;

    wire in3 = in[3];

    always_comb begin
		case (state)
			BYTE1: next = in3 ? BYTE2 : BYTE1;
			BYTE2: next = BYTE3;
			BYTE3: next = DONE;
			DONE: next = in3 ? BYTE2 : BYTE1;
		endcase
    end

    always @(posedge clk) begin
		if (reset) state <= BYTE1;
        else state <= next;
	end

	assign done = (state==DONE);

endmodule

module stimulus_gen (
	input clk,
	output logic [7:0] in,
	output logic reset
);

	initial begin
		repeat(200) @(negedge clk) begin
			in <= $random;
			reset <= !($random & 31);
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_done;
		int errortime_done;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [7:0] in;
	logic reset;
	logic done_ref;
	logic done_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,in,reset,done_ref,done_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.reset );
	reference_module good1 (
		.clk,
		.in,
		.reset,
		.done(done_ref) );

	top_module top_module1 (
		.clk,
		.in,
		.reset,
		.done(done_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_done) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "done", stats1.errors_done, stats1.errortime_done);
		else $display("Hint: Output '%s' has no mismatches.", "done");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { done_ref } === ( { done_ref } ^ { done_dut } ^ { done_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (done_ref !== ( done_ref ^ done_dut ^ done_ref ))
		begin if (stats1.errors_done == 0) stats1.errortime_done = $time;
			stats1.errors_done = stats1.errors_done+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input clk,
	input [7:0] in,
	input reset,
	output [23:0] out_bytes,
	output done
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input [7:0] in,
	input reset,
	output [23:0] out_bytes,
	output done
);
	parameter BYTE1=0, BYTE2=1, BYTE3=2, DONE=3;
	reg [1:0] state;
	reg [1:0] next;

    wire in3 = in[3];

    always_comb begin
		case (state)
			BYTE1: next = in3 ? BYTE2 : BYTE1;
			BYTE2: next = BYTE3;
			BYTE3: next = DONE;
			DONE: next = in3 ? BYTE2 : BYTE1;
		endcase
    end

    always @(posedge clk) begin
		if (reset) state <= BYTE1;
        else state <= next;
	end

	assign done = (state==DONE);

	reg [23:0] out_bytes_r;
	always @(posedge clk)
		out_bytes_r <= {out_bytes_r[15:0], in};

	// Implementations may vary: Allow user to do anything while the output doesn't have to be valid.
	assign out_bytes = done ? out_bytes_r : 'x;

endmodule

module stimulus_gen (
	input clk,
	output logic [7:0] in,
	output logic reset
);

	initial begin
		repeat(200) @(negedge clk) begin
			in <= $random;
			reset <= !($random & 31);
		end
		reset <= 1'b0;
		in <= '0;
		repeat(10) @(posedge clk);

		repeat(200) begin
			in <= $random;
			in[3] <= 1'b1;
			@(posedge clk);
			in <= $random;
			@(posedge clk);
			in <= $random;
			@(posedge clk);
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_bytes;
		int errortime_out_bytes;
		int errors_done;
		int errortime_done;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [7:0] in;
	logic reset;
	logic [23:0] out_bytes_ref;
	logic [23:0] out_bytes_dut;
	logic done_ref;
	logic done_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,in,reset,out_bytes_ref,out_bytes_dut,done_ref,done_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.reset );
	reference_module good1 (
		.clk,
		.in,
		.reset,
		.out_bytes(out_bytes_ref),
		.done(done_ref) );

	top_module top_module1 (
		.clk,
		.in,
		.reset,
		.out_bytes(out_bytes_dut),
		.done(done_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_bytes) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_bytes", stats1.errors_out_bytes, stats1.errortime_out_bytes);
		else $display("Hint: Output '%s' has no mismatches.", "out_bytes");
		if (stats1.errors_done) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "done", stats1.errors_done, stats1.errortime_done);
		else $display("Hint: Output '%s' has no mismatches.", "done");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_bytes_ref, done_ref } === ( { out_bytes_ref, done_ref } ^ { out_bytes_dut, done_dut } ^ { out_bytes_ref, done_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_bytes_ref !== ( out_bytes_ref ^ out_bytes_dut ^ out_bytes_ref ))
		begin if (stats1.errors_out_bytes == 0) stats1.errortime_out_bytes = $time;
			stats1.errors_out_bytes = stats1.errors_out_bytes+1'b1; end
		if (done_ref !== ( done_ref ^ done_dut ^ done_ref ))
		begin if (stats1.errors_done == 0) stats1.errortime_done = $time;
			stats1.errors_done = stats1.errors_done+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input clk,
	input [7:0] in,
	input reset,
	output [23:0] out_bytes,
	output done
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input [7:0] in,
	input reset,
	output [23:0] out_bytes,
	output done
);
	parameter BYTE1=0, BYTE2=1, BYTE3=2, DONE=3;
	reg [1:0] state;
	reg [1:0] next;

    wire in3 = in[3];

    always_comb begin
		case (state)
			BYTE1: next = in3 ? BYTE2 : BYTE1;
			BYTE2: next = BYTE3;
			BYTE3: next = DONE;
			DONE: next = in3 ? BYTE2 : BYTE1;
		endcase
    end

    always @(posedge clk) begin
		if (reset) state <= BYTE1;
        else state <= next;
	end

	assign done = (state==DONE);

	reg [23:0] out_bytes_r;
	always @(posedge clk)
		out_bytes_r <= {out_bytes_r[15:0], in};

	// Implementations may vary: Allow user to do anything while the output doesn't have to be valid.
	assign out_bytes = done ? out_bytes_r : 'x;

endmodule

module stimulus_gen (
	input clk,
	output logic [7:0] in,
	output logic reset
);

	initial begin
		repeat(200) @(negedge clk) begin
			in <= $random;
			reset <= !($random & 31);
		end
		reset <= 1'b0;
		in <= '0;
		repeat(10) @(posedge clk);

		repeat(200) begin
			in <= $random;
			in[3] <= 1'b1;
			@(posedge clk);
			in <= $random;
			@(posedge clk);
			in <= $random;
			@(posedge clk);
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_bytes;
		int errortime_out_bytes;
		int errors_done;
		int errortime_done;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [7:0] in;
	logic reset;
	logic [23:0] out_bytes_ref;
	logic [23:0] out_bytes_dut;
	logic done_ref;
	logic done_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,in,reset,out_bytes_ref,out_bytes_dut,done_ref,done_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.reset );
	reference_module good1 (
		.clk,
		.in,
		.reset,
		.out_bytes(out_bytes_ref),
		.done(done_ref) );

	top_module top_module1 (
		.clk,
		.in,
		.reset,
		.out_bytes(out_bytes_dut),
		.done(done_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_bytes) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_bytes", stats1.errors_out_bytes, stats1.errortime_out_bytes);
		else $display("Hint: Output '%s' has no mismatches.", "out_bytes");
		if (stats1.errors_done) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "done", stats1.errors_done, stats1.errortime_done);
		else $display("Hint: Output '%s' has no mismatches.", "done");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_bytes_ref, done_ref } === ( { out_bytes_ref, done_ref } ^ { out_bytes_dut, done_dut } ^ { out_bytes_ref, done_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_bytes_ref !== ( out_bytes_ref ^ out_bytes_dut ^ out_bytes_ref ))
		begin if (stats1.errors_out_bytes == 0) stats1.errortime_out_bytes = $time;
			stats1.errors_out_bytes = stats1.errors_out_bytes+1'b1; end
		if (done_ref !== ( done_ref ^ done_dut ^ done_ref ))
		begin if (stats1.errors_done == 0) stats1.errortime_done = $time;
			stats1.errors_done = stats1.errors_done+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input clk,
	input in,
	input reset,
	output done
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input in,
	input reset,
	output done
);
	parameter B0=0, B1=1, B2=2, B3=3, B4=4, B5=5, B6=6, B7=7, START=8, STOP=9, DONE=10, ERR=11;
	reg [3:0] state;
	reg [3:0] next;

    always_comb begin
		case (state)
			START: next = in ? START : B0;	// start bit is 0
			B0: next = B1;
			B1: next = B2;
			B2: next = B3;
			B3: next = B4;
			B4: next = B5;
			B5: next = B6;
			B6: next = B7;
			B7: next = STOP;
			STOP: next = in ? DONE : ERR;  // stop bit is 1. Idle state is 1.
			DONE: next = in ? START : B0;
			ERR: next = in ? START : ERR;
		endcase
    end

    always @(posedge clk) begin
		if (reset) state <= START;
        else state <= next;
	end

	assign done = (state==DONE);

endmodule

module stimulus_gen (
	input clk,
	output logic in,
	output logic reset
);

	initial begin
		reset <= 1;
		in <= 1;
		@(posedge clk);
		reset <= 0;
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(10) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(10) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);

		repeat(800) @(posedge clk, negedge clk) begin
			in <= $random;
			reset <= !($random & 31);
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_done;
		int errortime_done;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in;
	logic reset;
	logic done_ref;
	logic done_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,in,reset,done_ref,done_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.reset );
	reference_module good1 (
		.clk,
		.in,
		.reset,
		.done(done_ref) );

	top_module top_module1 (
		.clk,
		.in,
		.reset,
		.done(done_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_done) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "done", stats1.errors_done, stats1.errortime_done);
		else $display("Hint: Output '%s' has no mismatches.", "done");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { done_ref } === ( { done_ref } ^ { done_dut } ^ { done_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (done_ref !== ( done_ref ^ done_dut ^ done_ref ))
		begin if (stats1.errors_done == 0) stats1.errortime_done = $time;
			stats1.errors_done = stats1.errors_done+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input clk,
	input in,
	input reset,
	output done
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input in,
	input reset,
	output done
);
	parameter B0=0, B1=1, B2=2, B3=3, B4=4, B5=5, B6=6, B7=7, START=8, STOP=9, DONE=10, ERR=11;
	reg [3:0] state;
	reg [3:0] next;

    always_comb begin
		case (state)
			START: next = in ? START : B0;	// start bit is 0
			B0: next = B1;
			B1: next = B2;
			B2: next = B3;
			B3: next = B4;
			B4: next = B5;
			B5: next = B6;
			B6: next = B7;
			B7: next = STOP;
			STOP: next = in ? DONE : ERR;  // stop bit is 1. Idle state is 1.
			DONE: next = in ? START : B0;
			ERR: next = in ? START : ERR;
		endcase
    end

    always @(posedge clk) begin
		if (reset) state <= START;
        else state <= next;
	end

	assign done = (state==DONE);

endmodule

module stimulus_gen (
	input clk,
	output logic in,
	output logic reset
);

	initial begin
		reset <= 1;
		in <= 1;
		@(posedge clk);
		reset <= 0;
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(10) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(10) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);

		repeat(800) @(posedge clk, negedge clk) begin
			in <= $random;
			reset <= !($random & 31);
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_done;
		int errortime_done;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in;
	logic reset;
	logic done_ref;
	logic done_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,in,reset,done_ref,done_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.reset );
	reference_module good1 (
		.clk,
		.in,
		.reset,
		.done(done_ref) );

	top_module top_module1 (
		.clk,
		.in,
		.reset,
		.done(done_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_done) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "done", stats1.errors_done, stats1.errortime_done);
		else $display("Hint: Output '%s' has no mismatches.", "done");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { done_ref } === ( { done_ref } ^ { done_dut } ^ { done_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (done_ref !== ( done_ref ^ done_dut ^ done_ref ))
		begin if (stats1.errors_done == 0) stats1.errortime_done = $time;
			stats1.errors_done = stats1.errors_done+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input clk,
	input in,
	input reset,
	output [7:0] out_byte,
	output done
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input in,
	input reset,
	output [7:0] out_byte,
	output done
);
	parameter B0=0, B1=1, B2=2, B3=3, B4=4, B5=5, B6=6, B7=7, START=8, STOP=9, DONE=10, ERR=11;
	reg [3:0] state;
	reg [3:0] next;

    reg [9:0] byte_r;

    always_comb begin
		case (state)
			START: next = in ? START : B0;	// start bit is 0
			B0: next = B1;
			B1: next = B2;
			B2: next = B3;
			B3: next = B4;
			B4: next = B5;
			B5: next = B6;
			B6: next = B7;
			B7: next = STOP;
			STOP: next = in ? DONE : ERR;  // stop bit is 1. Idle state is 1.
			DONE: next = in ? START : B0;
			ERR: next = in ? START : ERR;
		endcase
    end

    always @(posedge clk) begin
		if (reset) state <= START;
        else state <= next;
	end

	always @(posedge clk) begin
		byte_r <= {in, byte_r[9:1]};
	end

	assign done = (state==DONE);
	assign out_byte = done ? byte_r[8:1] : 8'hx;

endmodule

module stimulus_gen (
	input clk,
	output logic in,
	output logic reset
);

	initial begin
		reset <= 1;
		in <= 1;
		@(posedge clk);
		reset <= 0;
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(10) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(10) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);

		repeat(800) @(posedge clk, negedge clk) begin
			in <= $random;
			reset <= !($random & 31);
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_byte;
		int errortime_out_byte;
		int errors_done;
		int errortime_done;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in;
	logic reset;
	logic [7:0] out_byte_ref;
	logic [7:0] out_byte_dut;
	logic done_ref;
	logic done_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,in,reset,out_byte_ref,out_byte_dut,done_ref,done_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.reset );
	reference_module good1 (
		.clk,
		.in,
		.reset,
		.out_byte(out_byte_ref),
		.done(done_ref) );

	top_module top_module1 (
		.clk,
		.in,
		.reset,
		.out_byte(out_byte_dut),
		.done(done_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_byte) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_byte", stats1.errors_out_byte, stats1.errortime_out_byte);
		else $display("Hint: Output '%s' has no mismatches.", "out_byte");
		if (stats1.errors_done) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "done", stats1.errors_done, stats1.errortime_done);
		else $display("Hint: Output '%s' has no mismatches.", "done");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_byte_ref, done_ref } === ( { out_byte_ref, done_ref } ^ { out_byte_dut, done_dut } ^ { out_byte_ref, done_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_byte_ref !== ( out_byte_ref ^ out_byte_dut ^ out_byte_ref ))
		begin if (stats1.errors_out_byte == 0) stats1.errortime_out_byte = $time;
			stats1.errors_out_byte = stats1.errors_out_byte+1'b1; end
		if (done_ref !== ( done_ref ^ done_dut ^ done_ref ))
		begin if (stats1.errors_done == 0) stats1.errortime_done = $time;
			stats1.errors_done = stats1.errors_done+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input clk,
	input in,
	input reset,
	output [7:0] out_byte,
	output done
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input clk,
	input in,
	input reset,
	output [7:0] out_byte,
	output done
);
	parameter B0=0, B1=1, B2=2, B3=3, B4=4, B5=5, B6=6, B7=7, START=8, STOP=9, DONE=10, ERR=11;
	reg [3:0] state;
	reg [3:0] next;

    reg [9:0] byte_r;

    always_comb begin
		case (state)
			START: next = in ? START : B0;	// start bit is 0
			B0: next = B1;
			B1: next = B2;
			B2: next = B3;
			B3: next = B4;
			B4: next = B5;
			B5: next = B6;
			B6: next = B7;
			B7: next = STOP;
			STOP: next = in ? DONE : ERR;  // stop bit is 1. Idle state is 1.
			DONE: next = in ? START : B0;
			ERR: next = in ? START : ERR;
		endcase
    end

    always @(posedge clk) begin
		if (reset) state <= START;
        else state <= next;
	end

	always @(posedge clk) begin
		byte_r <= {in, byte_r[9:1]};
	end

	assign done = (state==DONE);
	assign out_byte = done ? byte_r[8:1] : 8'hx;

endmodule

module stimulus_gen (
	input clk,
	output logic in,
	output logic reset
);

	initial begin
		reset <= 1;
		in <= 1;
		@(posedge clk);
		reset <= 0;
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(10) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(10) @(posedge clk);
		in <= 1;
		@(posedge clk);
		in <= 0;
		repeat(9) @(posedge clk);
		in <= 1;
		@(posedge clk);

		repeat(800) @(posedge clk, negedge clk) begin
			in <= $random;
			reset <= !($random & 31);
		end

		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_byte;
		int errortime_out_byte;
		int errors_done;
		int errortime_done;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic in;
	logic reset;
	logic [7:0] out_byte_ref;
	logic [7:0] out_byte_dut;
	logic done_ref;
	logic done_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,in,reset,out_byte_ref,out_byte_dut,done_ref,done_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in,
		.reset );
	reference_module good1 (
		.clk,
		.in,
		.reset,
		.out_byte(out_byte_ref),
		.done(done_ref) );

	top_module top_module1 (
		.clk,
		.in,
		.reset,
		.out_byte(out_byte_dut),
		.done(done_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_byte) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_byte", stats1.errors_out_byte, stats1.errortime_out_byte);
		else $display("Hint: Output '%s' has no mismatches.", "out_byte");
		if (stats1.errors_done) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "done", stats1.errors_done, stats1.errortime_done);
		else $display("Hint: Output '%s' has no mismatches.", "done");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_byte_ref, done_ref } === ( { out_byte_ref, done_ref } ^ { out_byte_dut, done_dut } ^ { out_byte_ref, done_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_byte_ref !== ( out_byte_ref ^ out_byte_dut ^ out_byte_ref ))
		begin if (stats1.errors_out_byte == 0) stats1.errortime_out_byte = $time;
			stats1.errors_out_byte = stats1.errors_out_byte+1'b1; end
		if (done_ref !== ( done_ref ^ done_dut ^ done_ref ))
		begin if (stats1.errors_done == 0) stats1.errortime_done = $time;
			stats1.errors_done = stats1.errors_done+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input a,
	input b,
	output out_and,
	output out_or,
	output out_xor,
	output out_nand,
	output out_nor,
	output out_xnor,
	output out_anotb
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input a,
	input b,
	output out_and,
	output out_or,
	output out_xor,
	output out_nand,
	output out_nor,
	output out_xnor,
	output out_anotb
);

	assign out_and = a&b;
	assign out_or = a|b;
	assign out_xor = a^b;
	assign out_nand = ~(a&b);
	assign out_nor = ~(a|b);
	assign out_xnor = a^~b;
	assign out_anotb = a & ~b;

endmodule

module stimulus_gen (
	input clk,
	output logic a,b,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		@(negedge clk) {a,b} <= 0;
		wavedrom_start();
			@(posedge clk) {a,b} <= 0;
			@(posedge clk) {a,b} <= 1;
			@(posedge clk) {a,b} <= 2;
			@(posedge clk) {a,b} <= 3;
			@(negedge clk);
		wavedrom_stop();
		repeat(200) @(posedge clk, negedge clk)
		{a,b} <= $random;
		$finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_and;
		int errortime_out_and;
		int errors_out_or;
		int errortime_out_or;
		int errors_out_xor;
		int errortime_out_xor;
		int errors_out_nand;
		int errortime_out_nand;
		int errors_out_nor;
		int errortime_out_nor;
		int errors_out_xnor;
		int errortime_out_xnor;
		int errors_out_anotb;
		int errortime_out_anotb;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic a;
	logic b;
	logic out_and_ref;
	logic out_and_dut;
	logic out_or_ref;
	logic out_or_dut;
	logic out_xor_ref;
	logic out_xor_dut;
	logic out_nand_ref;
	logic out_nand_dut;
	logic out_nor_ref;
	logic out_nor_dut;
	logic out_xnor_ref;
	logic out_xnor_dut;
	logic out_anotb_ref;
	logic out_anotb_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,a,b,out_and_ref,out_and_dut,out_or_ref,out_or_dut,out_xor_ref,out_xor_dut,out_nand_ref,out_nand_dut,out_nor_ref,out_nor_dut,out_xnor_ref,out_xnor_dut,out_anotb_ref,out_anotb_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.a,
		.b );
	reference_module good1 (
		.a,
		.b,
		.out_and(out_and_ref),
		.out_or(out_or_ref),
		.out_xor(out_xor_ref),
		.out_nand(out_nand_ref),
		.out_nor(out_nor_ref),
		.out_xnor(out_xnor_ref),
		.out_anotb(out_anotb_ref) );

	top_module top_module1 (
		.a,
		.b,
		.out_and(out_and_dut),
		.out_or(out_or_dut),
		.out_xor(out_xor_dut),
		.out_nand(out_nand_dut),
		.out_nor(out_nor_dut),
		.out_xnor(out_xnor_dut),
		.out_anotb(out_anotb_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_and) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_and", stats1.errors_out_and, stats1.errortime_out_and);
		else $display("Hint: Output '%s' has no mismatches.", "out_and");
		if (stats1.errors_out_or) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_or", stats1.errors_out_or, stats1.errortime_out_or);
		else $display("Hint: Output '%s' has no mismatches.", "out_or");
		if (stats1.errors_out_xor) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_xor", stats1.errors_out_xor, stats1.errortime_out_xor);
		else $display("Hint: Output '%s' has no mismatches.", "out_xor");
		if (stats1.errors_out_nand) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_nand", stats1.errors_out_nand, stats1.errortime_out_nand);
		else $display("Hint: Output '%s' has no mismatches.", "out_nand");
		if (stats1.errors_out_nor) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_nor", stats1.errors_out_nor, stats1.errortime_out_nor);
		else $display("Hint: Output '%s' has no mismatches.", "out_nor");
		if (stats1.errors_out_xnor) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_xnor", stats1.errors_out_xnor, stats1.errortime_out_xnor);
		else $display("Hint: Output '%s' has no mismatches.", "out_xnor");
		if (stats1.errors_out_anotb) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_anotb", stats1.errors_out_anotb, stats1.errortime_out_anotb);
		else $display("Hint: Output '%s' has no mismatches.", "out_anotb");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_and_ref, out_or_ref, out_xor_ref, out_nand_ref, out_nor_ref, out_xnor_ref, out_anotb_ref } === ( { out_and_ref, out_or_ref, out_xor_ref, out_nand_ref, out_nor_ref, out_xnor_ref, out_anotb_ref } ^ { out_and_dut, out_or_dut, out_xor_dut, out_nand_dut, out_nor_dut, out_xnor_dut, out_anotb_dut } ^ { out_and_ref, out_or_ref, out_xor_ref, out_nand_ref, out_nor_ref, out_xnor_ref, out_anotb_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_and_ref !== ( out_and_ref ^ out_and_dut ^ out_and_ref ))
		begin if (stats1.errors_out_and == 0) stats1.errortime_out_and = $time;
			stats1.errors_out_and = stats1.errors_out_and+1'b1; end
		if (out_or_ref !== ( out_or_ref ^ out_or_dut ^ out_or_ref ))
		begin if (stats1.errors_out_or == 0) stats1.errortime_out_or = $time;
			stats1.errors_out_or = stats1.errors_out_or+1'b1; end
		if (out_xor_ref !== ( out_xor_ref ^ out_xor_dut ^ out_xor_ref ))
		begin if (stats1.errors_out_xor == 0) stats1.errortime_out_xor = $time;
			stats1.errors_out_xor = stats1.errors_out_xor+1'b1; end
		if (out_nand_ref !== ( out_nand_ref ^ out_nand_dut ^ out_nand_ref ))
		begin if (stats1.errors_out_nand == 0) stats1.errortime_out_nand = $time;
			stats1.errors_out_nand = stats1.errors_out_nand+1'b1; end
		if (out_nor_ref !== ( out_nor_ref ^ out_nor_dut ^ out_nor_ref ))
		begin if (stats1.errors_out_nor == 0) stats1.errortime_out_nor = $time;
			stats1.errors_out_nor = stats1.errors_out_nor+1'b1; end
		if (out_xnor_ref !== ( out_xnor_ref ^ out_xnor_dut ^ out_xnor_ref ))
		begin if (stats1.errors_out_xnor == 0) stats1.errortime_out_xnor = $time;
			stats1.errors_out_xnor = stats1.errors_out_xnor+1'b1; end
		if (out_anotb_ref !== ( out_anotb_ref ^ out_anotb_dut ^ out_anotb_ref ))
		begin if (stats1.errors_out_anotb == 0) stats1.errortime_out_anotb = $time;
			stats1.errors_out_anotb = stats1.errors_out_anotb+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input [99:0] in,
	output out_and,
	output out_or,
	output out_xor
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [99:0] in,
	output out_and,
	output out_or,
	output out_xor
);

	assign out_and = ∈
	assign out_or = |in;
	assign out_xor = ^in;

endmodule

module stimulus_gen (
	input clk,
	input tb_match,
	output logic [99:0] in,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		reg [3:0] count; count = 0;
		in <= 100'h0;
		// AND gate uses huge numbers and creates a sparse waveform.
		@(negedge clk) wavedrom_start("Test AND gate");
			@(posedge clk,negedge clk) in <= 100'h0;		// Test OR gate
			@(posedge clk,negedge clk); in <= ~100'h0;		// Test AND gate
			@(posedge clk,negedge clk); in <= 100'h3ffff;
			@(posedge clk,negedge clk); in <= ~100'h3ffff;
			@(posedge clk,negedge clk); in <= 100'h80;
			@(posedge clk,negedge clk); in <= ~100'h80;
		wavedrom_stop();

		@(negedge clk) wavedrom_start("Test OR and XOR gates");
			@(posedge clk) in <= 100'h0;		// Test OR gate
			@(posedge clk); in <= 100'h7;		// Test AND gate
			repeat(10) @(posedge clk, negedge clk) begin
				in <= count;
				count <= count + 1;
			end
			@(posedge clk) in <= 100'h0;
		@(negedge clk) wavedrom_stop();

		in <= $random;
		repeat(100) begin
			@(negedge clk) in <= $random;
			@(posedge clk) in <= $random;
		end
		for (int i=0;i<100;i++) begin
			@(negedge clk) in <= 100'h1<<i;
			@(posedge clk) in <= ~(100'h1<<i);
		end
		@(posedge clk) in <= 100'h0;		// Test OR gate
		@(posedge clk); in <= ~100'h0;		// Test AND gate
		@(posedge clk);
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_and;
		int errortime_out_and;
		int errors_out_or;
		int errortime_out_or;
		int errors_out_xor;
		int errortime_out_xor;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [99:0] in;
	logic out_and_ref;
	logic out_and_dut;
	logic out_or_ref;
	logic out_or_dut;
	logic out_xor_ref;
	logic out_xor_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_and_ref,out_and_dut,out_or_ref,out_or_dut,out_xor_ref,out_xor_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out_and(out_and_ref),
		.out_or(out_or_ref),
		.out_xor(out_xor_ref) );

	top_module top_module1 (
		.in,
		.out_and(out_and_dut),
		.out_or(out_or_dut),
		.out_xor(out_xor_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_and) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_and", stats1.errors_out_and, stats1.errortime_out_and);
		else $display("Hint: Output '%s' has no mismatches.", "out_and");
		if (stats1.errors_out_or) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_or", stats1.errors_out_or, stats1.errortime_out_or);
		else $display("Hint: Output '%s' has no mismatches.", "out_or");
		if (stats1.errors_out_xor) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_xor", stats1.errors_out_xor, stats1.errortime_out_xor);
		else $display("Hint: Output '%s' has no mismatches.", "out_xor");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_and_ref, out_or_ref, out_xor_ref } === ( { out_and_ref, out_or_ref, out_xor_ref } ^ { out_and_dut, out_or_dut, out_xor_dut } ^ { out_and_ref, out_or_ref, out_xor_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_and_ref !== ( out_and_ref ^ out_and_dut ^ out_and_ref ))
		begin if (stats1.errors_out_and == 0) stats1.errortime_out_and = $time;
			stats1.errors_out_and = stats1.errors_out_and+1'b1; end
		if (out_or_ref !== ( out_or_ref ^ out_or_dut ^ out_or_ref ))
		begin if (stats1.errors_out_or == 0) stats1.errortime_out_or = $time;
			stats1.errors_out_or = stats1.errors_out_or+1'b1; end
		if (out_xor_ref !== ( out_xor_ref ^ out_xor_dut ^ out_xor_ref ))
		begin if (stats1.errors_out_xor == 0) stats1.errortime_out_xor = $time;
			stats1.errors_out_xor = stats1.errors_out_xor+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input [3:0] in,
	output out_and,
	output out_or,
	output out_xor
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [3:0] in,
	output out_and,
	output out_or,
	output out_xor
);

	assign out_and = ∈
	assign out_or = |in;
	assign out_xor = ^in;

endmodule

module stimulus_gen (
	input clk,
	output logic [3:0] in,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		in <= 0;
		@(negedge clk) wavedrom_start("All combinations");
			@(posedge clk);
			repeat(15) @(posedge clk) in <= in + 1;
		@(negedge clk) wavedrom_stop();
		repeat(200) @(posedge clk, negedge clk)
			in <= $random;
		$finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_and;
		int errortime_out_and;
		int errors_out_or;
		int errortime_out_or;
		int errors_out_xor;
		int errortime_out_xor;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [3:0] in;
	logic out_and_ref;
	logic out_and_dut;
	logic out_or_ref;
	logic out_or_dut;
	logic out_xor_ref;
	logic out_xor_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_and_ref,out_and_dut,out_or_ref,out_or_dut,out_xor_ref,out_xor_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out_and(out_and_ref),
		.out_or(out_or_ref),
		.out_xor(out_xor_ref) );

	top_module top_module1 (
		.in,
		.out_and(out_and_dut),
		.out_or(out_or_dut),
		.out_xor(out_xor_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_and) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_and", stats1.errors_out_and, stats1.errortime_out_and);
		else $display("Hint: Output '%s' has no mismatches.", "out_and");
		if (stats1.errors_out_or) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_or", stats1.errors_out_or, stats1.errortime_out_or);
		else $display("Hint: Output '%s' has no mismatches.", "out_or");
		if (stats1.errors_out_xor) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_xor", stats1.errors_out_xor, stats1.errortime_out_xor);
		else $display("Hint: Output '%s' has no mismatches.", "out_xor");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_and_ref, out_or_ref, out_xor_ref } === ( { out_and_ref, out_or_ref, out_xor_ref } ^ { out_and_dut, out_or_dut, out_xor_dut } ^ { out_and_ref, out_or_ref, out_xor_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_and_ref !== ( out_and_ref ^ out_and_dut ^ out_and_ref ))
		begin if (stats1.errors_out_and == 0) stats1.errortime_out_and = $time;
			stats1.errors_out_and = stats1.errors_out_and+1'b1; end
		if (out_or_ref !== ( out_or_ref ^ out_or_dut ^ out_or_ref ))
		begin if (stats1.errors_out_or == 0) stats1.errortime_out_or = $time;
			stats1.errors_out_or = stats1.errors_out_or+1'b1; end
		if (out_xor_ref !== ( out_xor_ref ^ out_xor_dut ^ out_xor_ref ))
		begin if (stats1.errors_out_xor == 0) stats1.errortime_out_xor = $time;
			stats1.errors_out_xor = stats1.errors_out_xor+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input [3:0] in,
	output [2:0] out_both,
	output [3:1] out_any,
	output [3:0] out_different
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [3:0] in,
	output [2:0] out_both,
	output [3:1] out_any,
	output [3:0] out_different
);

	assign out_both = in[2:0] & in[3:1];
	assign out_any = in[2:0] | in[3:1];
	assign out_different = in^{in[0], in[3:1]};

endmodule

module stimulus_gen (
	input clk,
	input tb_match,
	output logic [3:0] in,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		in <= 4'h3;
		@(negedge clk);
		wavedrom_start();
			@(posedge clk) in <= 3;
			@(posedge clk) in <= 6;
			@(posedge clk) in <= 12;
			@(posedge clk) in <= 9;
			@(posedge clk) in <= 5;
		@(negedge clk);
		wavedrom_stop();
		in <= $random;
		repeat(100) begin
			@(negedge clk) in <= $random;
			@(posedge clk) in <= $random;
		end
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_both;
		int errortime_out_both;
		int errors_out_any;
		int errortime_out_any;
		int errors_out_different;
		int errortime_out_different;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [3:0] in;
	logic [2:0] out_both_ref;
	logic [2:0] out_both_dut;
	logic [3:1] out_any_ref;
	logic [3:1] out_any_dut;
	logic [3:0] out_different_ref;
	logic [3:0] out_different_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_both_ref,out_both_dut,out_any_ref,out_any_dut,out_different_ref,out_different_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out_both(out_both_ref),
		.out_any(out_any_ref),
		.out_different(out_different_ref) );

	top_module top_module1 (
		.in,
		.out_both(out_both_dut),
		.out_any(out_any_dut),
		.out_different(out_different_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_both) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_both", stats1.errors_out_both, stats1.errortime_out_both);
		else $display("Hint: Output '%s' has no mismatches.", "out_both");
		if (stats1.errors_out_any) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_any", stats1.errors_out_any, stats1.errortime_out_any);
		else $display("Hint: Output '%s' has no mismatches.", "out_any");
		if (stats1.errors_out_different) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_different", stats1.errors_out_different, stats1.errortime_out_different);
		else $display("Hint: Output '%s' has no mismatches.", "out_different");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_both_ref, out_any_ref, out_different_ref } === ( { out_both_ref, out_any_ref, out_different_ref } ^ { out_both_dut, out_any_dut, out_different_dut } ^ { out_both_ref, out_any_ref, out_different_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_both_ref !== ( out_both_ref ^ out_both_dut ^ out_both_ref ))
		begin if (stats1.errors_out_both == 0) stats1.errortime_out_both = $time;
			stats1.errors_out_both = stats1.errors_out_both+1'b1; end
		if (out_any_ref !== ( out_any_ref ^ out_any_dut ^ out_any_ref ))
		begin if (stats1.errors_out_any == 0) stats1.errortime_out_any = $time;
			stats1.errors_out_any = stats1.errors_out_any+1'b1; end
		if (out_different_ref !== ( out_different_ref ^ out_different_dut ^ out_different_ref ))
		begin if (stats1.errors_out_different == 0) stats1.errortime_out_different = $time;
			stats1.errors_out_different = stats1.errors_out_different+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input [3:0] in,
	output [2:0] out_both,
	output [3:1] out_any,
	output [3:0] out_different
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [3:0] in,
	output [2:0] out_both,
	output [3:1] out_any,
	output [3:0] out_different
);

	assign out_both = in[2:0] & in[3:1];
	assign out_any = in[2:0] | in[3:1];
	assign out_different = in^{in[0], in[3:1]};

endmodule

module stimulus_gen (
	input clk,
	input tb_match,
	output logic [3:0] in,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	initial begin
		in <= 4'h3;
		@(negedge clk);
		wavedrom_start();
			@(posedge clk) in <= 3;
			@(posedge clk) in <= 6;
			@(posedge clk) in <= 12;
			@(posedge clk) in <= 9;
			@(posedge clk) in <= 5;
		@(negedge clk);
		wavedrom_stop();
		in <= $random;
		repeat(100) begin
			@(negedge clk) in <= $random;
			@(posedge clk) in <= $random;
		end
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_both;
		int errortime_out_both;
		int errors_out_any;
		int errortime_out_any;
		int errors_out_different;
		int errortime_out_different;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [3:0] in;
	logic [2:0] out_both_ref;
	logic [2:0] out_both_dut;
	logic [3:1] out_any_ref;
	logic [3:1] out_any_dut;
	logic [3:0] out_different_ref;
	logic [3:0] out_different_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_both_ref,out_both_dut,out_any_ref,out_any_dut,out_different_ref,out_different_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out_both(out_both_ref),
		.out_any(out_any_ref),
		.out_different(out_different_ref) );

	top_module top_module1 (
		.in,
		.out_both(out_both_dut),
		.out_any(out_any_dut),
		.out_different(out_different_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_both) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_both", stats1.errors_out_both, stats1.errortime_out_both);
		else $display("Hint: Output '%s' has no mismatches.", "out_both");
		if (stats1.errors_out_any) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_any", stats1.errors_out_any, stats1.errortime_out_any);
		else $display("Hint: Output '%s' has no mismatches.", "out_any");
		if (stats1.errors_out_different) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_different", stats1.errors_out_different, stats1.errortime_out_different);
		else $display("Hint: Output '%s' has no mismatches.", "out_different");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_both_ref, out_any_ref, out_different_ref } === ( { out_both_ref, out_any_ref, out_different_ref } ^ { out_both_dut, out_any_dut, out_different_dut } ^ { out_both_ref, out_any_ref, out_different_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_both_ref !== ( out_both_ref ^ out_both_dut ^ out_both_ref ))
		begin if (stats1.errors_out_both == 0) stats1.errortime_out_both = $time;
			stats1.errors_out_both = stats1.errors_out_both+1'b1; end
		if (out_any_ref !== ( out_any_ref ^ out_any_dut ^ out_any_ref ))
		begin if (stats1.errors_out_any == 0) stats1.errortime_out_any = $time;
			stats1.errors_out_any = stats1.errors_out_any+1'b1; end
		if (out_different_ref !== ( out_different_ref ^ out_different_dut ^ out_different_ref ))
		begin if (stats1.errors_out_different == 0) stats1.errortime_out_different = $time;
			stats1.errors_out_different = stats1.errors_out_different+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input [99:0] in,
	output [98:0] out_both,
	output [99:1] out_any,
	output [99:0] out_different
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [99:0] in,
	output [98:0] out_both,
	output [99:1] out_any,
	output [99:0] out_different
);

	assign out_both = in & in[99:1];
	assign out_any = in | in[99:1];
	assign out_different = in^{in[0], in[99:1]};

endmodule

module stimulus_gen (
	input clk,
	input tb_match,
	output logic [99:0] in
);

	initial begin
		in <= $random;
		repeat(100) begin
			@(negedge clk) in <= $random;
			@(posedge clk) in <= $random;
		end
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_both;
		int errortime_out_both;
		int errors_out_any;
		int errortime_out_any;
		int errors_out_different;
		int errortime_out_different;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [99:0] in;
	logic [98:0] out_both_ref;
	logic [98:0] out_both_dut;
	logic [99:1] out_any_ref;
	logic [99:1] out_any_dut;
	logic [99:0] out_different_ref;
	logic [99:0] out_different_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_both_ref,out_both_dut,out_any_ref,out_any_dut,out_different_ref,out_different_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out_both(out_both_ref),
		.out_any(out_any_ref),
		.out_different(out_different_ref) );

	top_module top_module1 (
		.in,
		.out_both(out_both_dut),
		.out_any(out_any_dut),
		.out_different(out_different_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_both) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_both", stats1.errors_out_both, stats1.errortime_out_both);
		else $display("Hint: Output '%s' has no mismatches.", "out_both");
		if (stats1.errors_out_any) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_any", stats1.errors_out_any, stats1.errortime_out_any);
		else $display("Hint: Output '%s' has no mismatches.", "out_any");
		if (stats1.errors_out_different) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_different", stats1.errors_out_different, stats1.errortime_out_different);
		else $display("Hint: Output '%s' has no mismatches.", "out_different");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_both_ref, out_any_ref, out_different_ref } === ( { out_both_ref, out_any_ref, out_different_ref } ^ { out_both_dut, out_any_dut, out_different_dut } ^ { out_both_ref, out_any_ref, out_different_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_both_ref !== ( out_both_ref ^ out_both_dut ^ out_both_ref ))
		begin if (stats1.errors_out_both == 0) stats1.errortime_out_both = $time;
			stats1.errors_out_both = stats1.errors_out_both+1'b1; end
		if (out_any_ref !== ( out_any_ref ^ out_any_dut ^ out_any_ref ))
		begin if (stats1.errors_out_any == 0) stats1.errortime_out_any = $time;
			stats1.errors_out_any = stats1.errors_out_any+1'b1; end
		if (out_different_ref !== ( out_different_ref ^ out_different_dut ^ out_different_ref ))
		begin if (stats1.errors_out_different == 0) stats1.errortime_out_different = $time;
			stats1.errors_out_different = stats1.errors_out_different+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input [99:0] in,
	output [98:0] out_both,
	output [99:1] out_any,
	output [99:0] out_different
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input [99:0] in,
	output [98:0] out_both,
	output [99:1] out_any,
	output [99:0] out_different
);

	assign out_both = in & in[99:1];
	assign out_any = in | in[99:1];
	assign out_different = in^{in[0], in[99:1]};

endmodule

module stimulus_gen (
	input clk,
	input tb_match,
	output logic [99:0] in
);

	initial begin
		in <= $random;
		repeat(100) begin
			@(negedge clk) in <= $random;
			@(posedge clk) in <= $random;
		end
		#1 $finish;
	end

endmodule

module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_out_both;
		int errortime_out_both;
		int errors_out_any;
		int errortime_out_any;
		int errors_out_different;
		int errortime_out_different;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic [99:0] in;
	logic [98:0] out_both_ref;
	logic [98:0] out_both_dut;
	logic [99:1] out_any_ref;
	logic [99:1] out_any_dut;
	logic [99:0] out_different_ref;
	logic [99:0] out_different_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,in,out_both_ref,out_both_dut,out_any_ref,out_any_dut,out_different_ref,out_different_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.in );
	reference_module good1 (
		.in,
		.out_both(out_both_ref),
		.out_any(out_any_ref),
		.out_different(out_different_ref) );

	top_module top_module1 (
		.in,
		.out_both(out_both_dut),
		.out_any(out_any_dut),
		.out_different(out_different_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_out_both) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_both", stats1.errors_out_both, stats1.errortime_out_both);
		else $display("Hint: Output '%s' has no mismatches.", "out_both");
		if (stats1.errors_out_any) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_any", stats1.errors_out_any, stats1.errortime_out_any);
		else $display("Hint: Output '%s' has no mismatches.", "out_any");
		if (stats1.errors_out_different) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "out_different", stats1.errors_out_different, stats1.errortime_out_different);
		else $display("Hint: Output '%s' has no mismatches.", "out_different");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { out_both_ref, out_any_ref, out_different_ref } === ( { out_both_ref, out_any_ref, out_different_ref } ^ { out_both_dut, out_any_dut, out_different_dut } ^ { out_both_ref, out_any_ref, out_different_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (out_both_ref !== ( out_both_ref ^ out_both_dut ^ out_both_ref ))
		begin if (stats1.errors_out_both == 0) stats1.errortime_out_both = $time;
			stats1.errors_out_both = stats1.errors_out_both+1'b1; end
		if (out_any_ref !== ( out_any_ref ^ out_any_dut ^ out_any_ref ))
		begin if (stats1.errors_out_any == 0) stats1.errortime_out_any = $time;
			stats1.errors_out_any = stats1.errors_out_any+1'b1; end
		if (out_different_ref !== ( out_different_ref ^ out_different_dut ^ out_different_ref ))
		begin if (stats1.errors_out_different == 0) stats1.errortime_out_different = $time;
			stats1.errors_out_different = stats1.errors_out_different+1'b1; end

	end
endmodule


Prompt:
module top_module(
	input clk,
	input areset,

	input predict_valid,
	input [6:0] predict_pc,
	output predict_taken,
	output [6:0] predict_history,

	input train_valid,
	input train_taken,
	input train_mispredicted,
	input [6:0] train_history,
	input [6:0] train_pc
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input clk,
	input areset,

	input predict_valid,
	input [6:0] predict_pc,
	output predict_taken,
	output [6:0] predict_history,

	input train_valid,
	input train_taken,
	input train_mispredicted,
	input [6:0] train_history,
	input [6:0] train_pc
);
	parameter n = 7;
	logic [1:0] pht [2**n-1:0];

	parameter [1:0] SNT = 0, LNT = 1, LT = 2, ST = 3;

	logic [n-1:0] predict_history_r;
	wire [n-1:0] predict_index = predict_history_r ^ predict_pc;
	wire [n-1:0] train_index = train_history ^ train_pc;

	always@(posedge clk, posedge areset)
		if (areset) begin
			for (integer i=0; i<2**n; i=i+1)
				pht[i] = LNT;
			predict_history_r = 0;
        end	else begin
			if (predict_valid)
				predict_history_r <= {predict_history_r, predict_taken};
			if(train_valid) begin
				if(pht[train_index] < 3 && train_taken)
					pht[train_index] <= pht[train_index] + 1;
				else if(pht[train_index] > 0 && !train_taken)
					pht[train_index] <= pht[train_index] - 1;
				if (train_mispredicted)
					predict_history_r <= {train_history, train_taken};
			end
		end

	assign predict_taken = predict_valid ? pht[predict_index][1] : 1'bx;
	assign predict_history = predict_valid ? predict_history_r : {n{1'bx}};
endmodule

module stimulus_gen
#(parameter N=7)
(
	input clk,
	output logic areset,

	output logic predict_valid,
	output [N-1:0] predict_pc,

	output logic train_valid,
	output train_taken,
	output train_mispredicted,
	output [N-1:0] train_history,
	output [N-1:0] train_pc,

	input tb_match,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable,
	output int wavedrom_hide_after_time
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	reg reset;
	task reset_test(input async=0);
		bit arfail, srfail, datafail;

		@(posedge clk);
		@(posedge clk) reset <= 0;
		repeat(3) @(posedge clk);

		@(negedge clk) begin datafail = !tb_match ; reset <= 1; end
		@(posedge clk) arfail = !tb_match;
		@(posedge clk) begin
			srfail = !tb_match;
			reset <= 0;
		end
		if (srfail)
			$display("Hint: Your reset doesn't seem to be working.");
		else if (arfail && (async || !datafail))
			$display("Hint: Your reset should be %0s, but doesn't appear to be.", async ? "asynchronous" : "synchronous");
		// Don't warn about synchronous reset if the half-cycle before is already wrong. It's more likely
		// a functionality error than the reset being implemented asynchronously.

	endtask

	assign areset = reset;

	logic [N-1:0] predict_pc_r;
	logic train_taken_r;
	logic train_mispredicted_r;
	logic [N-1:0] train_history_r;
	logic [N-1:0] train_pc_r;

	assign predict_pc = predict_valid ? predict_pc_r : {N{1'bx}};
	assign train_taken = train_valid ? train_taken_r : 1'bx;
	assign train_mispredicted = train_valid ? train_mispredicted_r : 1'bx;
	assign train_history = train_valid ? train_history_r : {N{1'bx}};
	assign train_pc = train_valid ? train_pc_r : {N{1'bx}};

	initial begin
		@(posedge clk) reset <= 1;
		@(posedge clk) reset <= 0;
		predict_valid <= 1;
		train_mispredicted_r <= 1;
		train_history_r <= 7'h7f;
		train_pc_r <= 7'h4;
		train_taken_r <= 1;
		train_valid <= 1;
		predict_valid <= 1;
		predict_pc_r <= 4;

		wavedrom_start("Asynchronous reset");
			reset_test(1); // Test for asynchronous reset
		wavedrom_stop();
		@(posedge clk) reset <= 1;
		predict_valid <= 0;

		wavedrom_start("Training entries (pc = 0xa, history = 0 and 2)");
		predict_pc_r <= 7'ha;
		predict_valid <= 1;

		train_history_r <= 7'h0;
		train_pc_r <= 7'ha;
		train_taken_r <= 1;
		train_valid <= 0;
		train_mispredicted_r <= 0;

		@(negedge clk) reset <= 0;
		@(posedge clk) train_valid <= 1;
		@(posedge clk) train_history_r <= 7'h2;
		@(posedge clk) train_valid <= 0;

		repeat(4) @(posedge clk);
		train_history_r <= 7'h0;
		train_taken_r <= 0;
		train_valid <= 1;
		@(posedge clk) train_valid <= 0;

		repeat(8) @(posedge clk);
		wavedrom_stop();

		@(posedge clk);

		wavedrom_start("History register recovery on misprediction");
		reset <= 1;
		predict_pc_r <= 7'ha;
		predict_valid <= 1;

		train_history_r <= 7'h0;
		train_pc_r <= 7'ha;
		train_taken_r <= 1;
		train_valid <= 0;
		train_mispredicted_r <= 1;

		@(negedge clk) reset <= 0;
		@(posedge clk);
		@(posedge clk) train_valid <= 1;
		@(posedge clk) train_valid <= 0;
		@(posedge clk) train_valid <= 1;
		train_history_r <= 7'h10;
		train_taken_r <= 0;
		@(posedge clk) train_valid <= 0;

		repeat(4) @(posedge clk);
		train_history_r <= 7'h0;
		train_taken_r <= 0;
		train_valid <= 1;
		@(posedge clk) train_valid <= 0;
		@(posedge clk) train_valid <= 1;
		train_history_r <= 7'h20;
		@(posedge clk) train_valid <= 0;

		repeat(3) @(posedge clk);
		wavedrom_stop();

		repeat(1000) @(posedge clk,negedge clk) begin
			{predict_valid, predict_pc_r, train_pc_r, train_taken_r, train_valid} <= {$urandom};
			train_history_r <= $urandom;
			train_mispredicted_r <= !($urandom_range(0,31));
		end

		#1 $finish;
	end

endmodule
module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_predict_taken;
		int errortime_predict_taken;
		int errors_predict_history;
		int errortime_predict_history;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic areset;
	logic predict_valid;
	logic [6:0] predict_pc;
	logic train_valid;
	logic train_taken;
	logic train_mispredicted;
	logic [6:0] train_history;
	logic [6:0] train_pc;
	logic predict_taken_ref;
	logic predict_taken_dut;
	logic [6:0] predict_history_ref;
	logic [6:0] predict_history_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,areset,predict_valid,predict_pc,train_valid,train_taken,train_mispredicted,train_history,train_pc,predict_taken_ref,predict_taken_dut,predict_history_ref,predict_history_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.areset,
		.predict_valid,
		.predict_pc,
		.train_valid,
		.train_taken,
		.train_mispredicted,
		.train_history,
		.train_pc );
	reference_module good1 (
		.clk,
		.areset,
		.predict_valid,
		.predict_pc,
		.train_valid,
		.train_taken,
		.train_mispredicted,
		.train_history,
		.train_pc,
		.predict_taken(predict_taken_ref),
		.predict_history(predict_history_ref) );

	top_module top_module1 (
		.clk,
		.areset,
		.predict_valid,
		.predict_pc,
		.train_valid,
		.train_taken,
		.train_mispredicted,
		.train_history,
		.train_pc,
		.predict_taken(predict_taken_dut),
		.predict_history(predict_history_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_predict_taken) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "predict_taken", stats1.errors_predict_taken, stats1.errortime_predict_taken);
		else $display("Hint: Output '%s' has no mismatches.", "predict_taken");
		if (stats1.errors_predict_history) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "predict_history", stats1.errors_predict_history, stats1.errortime_predict_history);
		else $display("Hint: Output '%s' has no mismatches.", "predict_history");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { predict_taken_ref, predict_history_ref } === ( { predict_taken_ref, predict_history_ref } ^ { predict_taken_dut, predict_history_dut } ^ { predict_taken_ref, predict_history_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (predict_taken_ref !== ( predict_taken_ref ^ predict_taken_dut ^ predict_taken_ref ))
		begin if (stats1.errors_predict_taken == 0) stats1.errortime_predict_taken = $time;
			stats1.errors_predict_taken = stats1.errors_predict_taken+1'b1; end
		if (predict_history_ref !== ( predict_history_ref ^ predict_history_dut ^ predict_history_ref ))
		begin if (stats1.errors_predict_history == 0) stats1.errortime_predict_history = $time;
			stats1.errors_predict_history = stats1.errors_predict_history+1'b1; end

	end
endmodule


Prompt:
module top_module(
	input clk,
	input areset,

	input predict_valid,
	input [6:0] predict_pc,
	output predict_taken,
	output [6:0] predict_history,

	input train_valid,
	input train_taken,
	input train_mispredicted,
	input [6:0] train_history,
	input [6:0] train_pc
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module(
	input clk,
	input areset,

	input predict_valid,
	input [6:0] predict_pc,
	output predict_taken,
	output [6:0] predict_history,

	input train_valid,
	input train_taken,
	input train_mispredicted,
	input [6:0] train_history,
	input [6:0] train_pc
);
	parameter n = 7;
	logic [1:0] pht [2**n-1:0];

	parameter [1:0] SNT = 0, LNT = 1, LT = 2, ST = 3;

	logic [n-1:0] predict_history_r;
	wire [n-1:0] predict_index = predict_history_r ^ predict_pc;
	wire [n-1:0] train_index = train_history ^ train_pc;

	always@(posedge clk, posedge areset)
		if (areset) begin
			for (integer i=0; i<2**n; i=i+1)
				pht[i] = LNT;
			predict_history_r = 0;
        end	else begin
			if (predict_valid)
				predict_history_r <= {predict_history_r, predict_taken};
			if(train_valid) begin
				if(pht[train_index] < 3 && train_taken)
					pht[train_index] <= pht[train_index] + 1;
				else if(pht[train_index] > 0 && !train_taken)
					pht[train_index] <= pht[train_index] - 1;
				if (train_mispredicted)
					predict_history_r <= {train_history, train_taken};
			end
		end

	assign predict_taken = predict_valid ? pht[predict_index][1] : 1'bx;
	assign predict_history = predict_valid ? predict_history_r : {n{1'bx}};
endmodule

module stimulus_gen
#(parameter N=7)
(
	input clk,
	output logic areset,

	output logic predict_valid,
	output [N-1:0] predict_pc,

	output logic train_valid,
	output train_taken,
	output train_mispredicted,
	output [N-1:0] train_history,
	output [N-1:0] train_pc,

	input tb_match,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable,
	output int wavedrom_hide_after_time
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	reg reset;
	task reset_test(input async=0);
		bit arfail, srfail, datafail;

		@(posedge clk);
		@(posedge clk) reset <= 0;
		repeat(3) @(posedge clk);

		@(negedge clk) begin datafail = !tb_match ; reset <= 1; end
		@(posedge clk) arfail = !tb_match;
		@(posedge clk) begin
			srfail = !tb_match;
			reset <= 0;
		end
		if (srfail)
			$display("Hint: Your reset doesn't seem to be working.");
		else if (arfail && (async || !datafail))
			$display("Hint: Your reset should be %0s, but doesn't appear to be.", async ? "asynchronous" : "synchronous");
		// Don't warn about synchronous reset if the half-cycle before is already wrong. It's more likely
		// a functionality error than the reset being implemented asynchronously.

	endtask

	assign areset = reset;

	logic [N-1:0] predict_pc_r;
	logic train_taken_r;
	logic train_mispredicted_r;
	logic [N-1:0] train_history_r;
	logic [N-1:0] train_pc_r;

	assign predict_pc = predict_valid ? predict_pc_r : {N{1'bx}};
	assign train_taken = train_valid ? train_taken_r : 1'bx;
	assign train_mispredicted = train_valid ? train_mispredicted_r : 1'bx;
	assign train_history = train_valid ? train_history_r : {N{1'bx}};
	assign train_pc = train_valid ? train_pc_r : {N{1'bx}};

	initial begin
		@(posedge clk) reset <= 1;
		@(posedge clk) reset <= 0;
		predict_valid <= 1;
		train_mispredicted_r <= 1;
		train_history_r <= 7'h7f;
		train_pc_r <= 7'h4;
		train_taken_r <= 1;
		train_valid <= 1;
		predict_valid <= 1;
		predict_pc_r <= 4;

		wavedrom_start("Asynchronous reset");
			reset_test(1); // Test for asynchronous reset
		wavedrom_stop();
		@(posedge clk) reset <= 1;
		predict_valid <= 0;

		wavedrom_start("Training entries (pc = 0xa, history = 0 and 2)");
		predict_pc_r <= 7'ha;
		predict_valid <= 1;

		train_history_r <= 7'h0;
		train_pc_r <= 7'ha;
		train_taken_r <= 1;
		train_valid <= 0;
		train_mispredicted_r <= 0;

		@(negedge clk) reset <= 0;
		@(posedge clk) train_valid <= 1;
		@(posedge clk) train_history_r <= 7'h2;
		@(posedge clk) train_valid <= 0;

		repeat(4) @(posedge clk);
		train_history_r <= 7'h0;
		train_taken_r <= 0;
		train_valid <= 1;
		@(posedge clk) train_valid <= 0;

		repeat(8) @(posedge clk);
		wavedrom_stop();

		@(posedge clk);

		wavedrom_start("History register recovery on misprediction");
		reset <= 1;
		predict_pc_r <= 7'ha;
		predict_valid <= 1;

		train_history_r <= 7'h0;
		train_pc_r <= 7'ha;
		train_taken_r <= 1;
		train_valid <= 0;
		train_mispredicted_r <= 1;

		@(negedge clk) reset <= 0;
		@(posedge clk);
		@(posedge clk) train_valid <= 1;
		@(posedge clk) train_valid <= 0;
		@(posedge clk) train_valid <= 1;
		train_history_r <= 7'h10;
		train_taken_r <= 0;
		@(posedge clk) train_valid <= 0;

		repeat(4) @(posedge clk);
		train_history_r <= 7'h0;
		train_taken_r <= 0;
		train_valid <= 1;
		@(posedge clk) train_valid <= 0;
		@(posedge clk) train_valid <= 1;
		train_history_r <= 7'h20;
		@(posedge clk) train_valid <= 0;

		repeat(3) @(posedge clk);
		wavedrom_stop();

		repeat(1000) @(posedge clk,negedge clk) begin
			{predict_valid, predict_pc_r, train_pc_r, train_taken_r, train_valid} <= {$urandom};
			train_history_r <= $urandom;
			train_mispredicted_r <= !($urandom_range(0,31));
		end

		#1 $finish;
	end

endmodule
module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_predict_taken;
		int errortime_predict_taken;
		int errors_predict_history;
		int errortime_predict_history;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic areset;
	logic predict_valid;
	logic [6:0] predict_pc;
	logic train_valid;
	logic train_taken;
	logic train_mispredicted;
	logic [6:0] train_history;
	logic [6:0] train_pc;
	logic predict_taken_ref;
	logic predict_taken_dut;
	logic [6:0] predict_history_ref;
	logic [6:0] predict_history_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,areset,predict_valid,predict_pc,train_valid,train_taken,train_mispredicted,train_history,train_pc,predict_taken_ref,predict_taken_dut,predict_history_ref,predict_history_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.areset,
		.predict_valid,
		.predict_pc,
		.train_valid,
		.train_taken,
		.train_mispredicted,
		.train_history,
		.train_pc );
	reference_module good1 (
		.clk,
		.areset,
		.predict_valid,
		.predict_pc,
		.train_valid,
		.train_taken,
		.train_mispredicted,
		.train_history,
		.train_pc,
		.predict_taken(predict_taken_ref),
		.predict_history(predict_history_ref) );

	top_module top_module1 (
		.clk,
		.areset,
		.predict_valid,
		.predict_pc,
		.train_valid,
		.train_taken,
		.train_mispredicted,
		.train_history,
		.train_pc,
		.predict_taken(predict_taken_dut),
		.predict_history(predict_history_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_predict_taken) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "predict_taken", stats1.errors_predict_taken, stats1.errortime_predict_taken);
		else $display("Hint: Output '%s' has no mismatches.", "predict_taken");
		if (stats1.errors_predict_history) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "predict_history", stats1.errors_predict_history, stats1.errortime_predict_history);
		else $display("Hint: Output '%s' has no mismatches.", "predict_history");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { predict_taken_ref, predict_history_ref } === ( { predict_taken_ref, predict_history_ref } ^ { predict_taken_dut, predict_history_dut } ^ { predict_taken_ref, predict_history_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (predict_taken_ref !== ( predict_taken_ref ^ predict_taken_dut ^ predict_taken_ref ))
		begin if (stats1.errors_predict_taken == 0) stats1.errortime_predict_taken = $time;
			stats1.errors_predict_taken = stats1.errors_predict_taken+1'b1; end
		if (predict_history_ref !== ( predict_history_ref ^ predict_history_dut ^ predict_history_ref ))
		begin if (stats1.errors_predict_history == 0) stats1.errortime_predict_history = $time;
			stats1.errors_predict_history = stats1.errors_predict_history+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input a,
	input b,
	output sum,
	output cout
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input a,
	input b,
	output sum,
	output cout
);

	assign {cout, sum} = a+b;

endmodule

module stimulus_gen (
	input clk,
	output logic a,b
);

	always @(posedge clk, negedge clk)
		{a,b} <= $random;

	initial begin
		repeat(100) @(negedge clk);
		$finish;
	end

endmodule
module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_sum;
		int errortime_sum;
		int errors_cout;
		int errortime_cout;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic a;
	logic b;
	logic sum_ref;
	logic sum_dut;
	logic cout_ref;
	logic cout_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,a,b,sum_ref,sum_dut,cout_ref,cout_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.a,
		.b );
	reference_module good1 (
		.a,
		.b,
		.sum(sum_ref),
		.cout(cout_ref) );

	top_module top_module1 (
		.a,
		.b,
		.sum(sum_dut),
		.cout(cout_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_sum) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "sum", stats1.errors_sum, stats1.errortime_sum);
		else $display("Hint: Output '%s' has no mismatches.", "sum");
		if (stats1.errors_cout) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "cout", stats1.errors_cout, stats1.errortime_cout);
		else $display("Hint: Output '%s' has no mismatches.", "cout");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { sum_ref, cout_ref } === ( { sum_ref, cout_ref } ^ { sum_dut, cout_dut } ^ { sum_ref, cout_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (sum_ref !== ( sum_ref ^ sum_dut ^ sum_ref ))
		begin if (stats1.errors_sum == 0) stats1.errortime_sum = $time;
			stats1.errors_sum = stats1.errors_sum+1'b1; end
		if (cout_ref !== ( cout_ref ^ cout_dut ^ cout_ref ))
		begin if (stats1.errors_cout == 0) stats1.errortime_cout = $time;
			stats1.errors_cout = stats1.errors_cout+1'b1; end

	end
endmodule


Prompt:
module top_module (
	input a,
	input b,
	output sum,
	output cout
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module (
	input a,
	input b,
	output sum,
	output cout
);

	assign {cout, sum} = a+b;

endmodule

module stimulus_gen (
	input clk,
	output logic a,b
);

	always @(posedge clk, negedge clk)
		{a,b} <= $random;

	initial begin
		repeat(100) @(negedge clk);
		$finish;
	end

endmodule
module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_sum;
		int errortime_sum;
		int errors_cout;
		int errortime_cout;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic a;
	logic b;
	logic sum_ref;
	logic sum_dut;
	logic cout_ref;
	logic cout_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,a,b,sum_ref,sum_dut,cout_ref,cout_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.a,
		.b );
	reference_module good1 (
		.a,
		.b,
		.sum(sum_ref),
		.cout(cout_ref) );

	top_module top_module1 (
		.a,
		.b,
		.sum(sum_dut),
		.cout(cout_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_sum) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "sum", stats1.errors_sum, stats1.errortime_sum);
		else $display("Hint: Output '%s' has no mismatches.", "sum");
		if (stats1.errors_cout) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "cout", stats1.errors_cout, stats1.errortime_cout);
		else $display("Hint: Output '%s' has no mismatches.", "cout");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { sum_ref, cout_ref } === ( { sum_ref, cout_ref } ^ { sum_dut, cout_dut } ^ { sum_ref, cout_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (sum_ref !== ( sum_ref ^ sum_dut ^ sum_ref ))
		begin if (stats1.errors_sum == 0) stats1.errortime_sum = $time;
			stats1.errors_sum = stats1.errors_sum+1'b1; end
		if (cout_ref !== ( cout_ref ^ cout_dut ^ cout_ref ))
		begin if (stats1.errors_cout == 0) stats1.errortime_cout = $time;
			stats1.errors_cout = stats1.errors_cout+1'b1; end

	end
endmodule


Prompt:
module top_module
(
    input clk,
    input areset,
    input predict_valid,
    input predict_taken,
    output logic [31:0] predict_history,

    input train_mispredicted,
    input train_taken,
    input [31:0] train_history
);

`timescale 1 ps/1 ps
`define OK 12
`define INCORRECT 13
module reference_module
(
    input clk,
    input areset,
    input predict_valid,
    input predict_taken,
    output logic [31:0] predict_history,

    input train_mispredicted,
    input train_taken,
    input [31:0] train_history
);
    always@(posedge clk, posedge areset)
		if (areset) begin
			predict_history = 0;
        end	else begin
			if (train_mispredicted)
				predict_history <= {train_history, train_taken};
			else if (predict_valid)
				predict_history <= {predict_history, predict_taken};
		end
endmodule

module stimulus_gen
(
	input clk,
	output logic areset,

	output logic predict_valid,
	output predict_taken,

	output logic train_mispredicted,
	output train_taken,
	output [31:0] train_history,

	input tb_match,
	output reg[511:0] wavedrom_title,
	output reg wavedrom_enable,
	output int wavedrom_hide_after_time
);

// Add two ports to module stimulus_gen:
//    output [511:0] wavedrom_title
//    output reg wavedrom_enable

	task wavedrom_start(input[511:0] title = "");
	endtask

	task wavedrom_stop;
		#1;
	endtask

	reg reset;
	task reset_test(input async=0);
		bit arfail, srfail, datafail;

		@(posedge clk);
		@(posedge clk) reset <= 0;
		repeat(3) @(posedge clk);

		@(negedge clk) begin datafail = !tb_match ; reset <= 1; end
		@(posedge clk) arfail = !tb_match;
		@(posedge clk) begin
			srfail = !tb_match;
			reset <= 0;
		end
		if (srfail)
			$display("Hint: Your reset doesn't seem to be working.");
		else if (arfail && (async || !datafail))
			$display("Hint: Your reset should be %0s, but doesn't appear to be.", async ? "asynchronous" : "synchronous");
		// Don't warn about synchronous reset if the half-cycle before is already wrong. It's more likely
		// a functionality error than the reset being implemented asynchronously.

	endtask

	assign areset = reset;
	logic predict_taken_r;
	assign predict_taken = predict_valid ? predict_taken_r : 1'bx;

	logic train_taken_r;
	logic [31:0] train_history_r;
	assign train_taken = train_mispredicted ? train_taken_r : 1'bx;
	assign train_history = train_mispredicted ? train_history_r : 32'hx;

	initial begin
		@(posedge clk) reset <= 1;
		@(posedge clk) reset <= 0;
		predict_taken_r <= 1;
		predict_valid <= 1;
		train_mispredicted <= 0;
		train_history_r <= 32'h5;
		train_taken_r <= 1;

		wavedrom_start("Asynchronous reset");
			reset_test(1); // Test for asynchronous reset
		wavedrom_stop();
		@(posedge clk) reset <= 1;
		predict_valid <= 0;

		wavedrom_start("Predictions: Shift in");
		repeat(2) @(posedge clk) {predict_valid, predict_taken_r} <= {$urandom};
		reset <= 0;
		predict_valid <= 1;
		repeat(6) @(posedge clk) {predict_taken_r} <= {$urandom};
		predict_valid <= 0;
		repeat(3) @(posedge clk) {predict_taken_r} <= {$urandom};
		predict_valid <= 1;
		train_mispredicted <= 1;
		@(posedge clk) train_mispredicted <= 0;
		repeat(6) @(posedge clk) {predict_taken_r} <= {$urandom};
		wavedrom_stop();

		repeat(2000) @(posedge clk,negedge clk) begin
			{predict_valid, predict_taken_r, train_taken_r} <= {$urandom};
			train_history_r <= $urandom;
			train_mispredicted <= !($urandom_range(0,31));
		end

		#1 $finish;
	end

endmodule
module tb();

	typedef struct packed {
		int errors;
		int errortime;
		int errors_predict_history;
		int errortime_predict_history;

		int clocks;
	} stats;

	stats stats1;

	wire[511:0] wavedrom_title;
	wire wavedrom_enable;
	int wavedrom_hide_after_time;

	reg clk=0;
	initial forever
		#5 clk = ~clk;

	logic areset;
	logic predict_valid;
	logic predict_taken;
	logic train_mispredicted;
	logic train_taken;
	logic [31:0] train_history;
	logic [31:0] predict_history_ref;
	logic [31:0] predict_history_dut;

	initial begin
		$dumpfile("wave.vcd");
		$dumpvars(1, stim1.clk, tb_mismatch ,clk,areset,predict_valid,predict_taken,train_mispredicted,train_taken,train_history,predict_history_ref,predict_history_dut );
	end

	wire tb_match;		// Verification
	wire tb_mismatch = ~tb_match;

	stimulus_gen stim1 (
		.clk,
		.* ,
		.areset,
		.predict_valid,
		.predict_taken,
		.train_mispredicted,
		.train_taken,
		.train_history );
	reference_module good1 (
		.clk,
		.areset,
		.predict_valid,
		.predict_taken,
		.train_mispredicted,
		.train_taken,
		.train_history,
		.predict_history(predict_history_ref) );

	top_module top_module1 (
		.clk,
		.areset,
		.predict_valid,
		.predict_taken,
		.train_mispredicted,
		.train_taken,
		.train_history,
		.predict_history(predict_history_dut) );

	bit strobe = 0;
	task wait_for_end_of_timestep;
		repeat(5) begin
			strobe <= !strobe;  // Try to delay until the very end of the time step.
			@(strobe);
		end
	endtask

	final begin
		if (stats1.errors_predict_history) $display("Hint: Output '%s' has %0d mismatches. First mismatch occurred at time %0d.", "predict_history", stats1.errors_predict_history, stats1.errortime_predict_history);
		else $display("Hint: Output '%s' has no mismatches.", "predict_history");

		$display("Hint: Total mismatched samples is %1d out of %1d samples\n", stats1.errors, stats1.clocks);
		$display("Simulation finished at %0d ps", $time);
		$display("Mismatches: %1d in %1d samples", stats1.errors, stats1.clocks);
	end

	// Verification: XORs on the right makes any X in good_vector match anything, but X in dut_vector will only match X.
	assign tb_match = ( { predict_history_ref } === ( { predict_history_ref } ^ { predict_history_dut } ^ { predict_history_ref } ) );
	// Use explicit sensitivity list here. @(*) causes NetProc::nex_input() to be called when trying to compute
	// the sensitivity list of the @(strobe) process, which isn't implemented.
	always @(posedge clk, negedge clk) begin

		stats1.clocks++;
		if (!tb_match) begin
			if (stats1.errors == 0) stats1.errortime = $time;
			stats1.errors++;
		end
		if (predict_history_ref !== ( predict_history_ref ^ predict_history_dut ^ predict_history_ref ))
		begin if (stats1.errors_predict_history == 0) stats1.errortime_predict_history = $time;
			stats1.errors_predict_history = stats1.errors_predict_history+1'b1; end

	end
endmodule