1 files changed, 135 insertions, 0 deletions
diff --git a/scripts/smtbmc/tracecmp3.v b/scripts/smtbmc/tracecmp3.v
new file mode 100644
index 0000000..a1bb63b
--- /dev/null
+++ b/scripts/smtbmc/tracecmp3.v
@@ -0,0 +1,135 @@
+// Based on the benchmark from 2016 Yosys-SMTBMC presentation, which in turn is
+// based on the tracecmp2 test from this directory.
+
+module testbench (
+	input clk,
+	input [31:0] mem_rdata_in,
+
+	input             pcpi_wr,
+	input      [31:0] pcpi_rd,
+	input             pcpi_wait,
+	input             pcpi_ready
+);
+	reg resetn = 0;
+
+	always @(posedge clk)
+		resetn <= 1;
+
+	wire        cpu0_trap;
+	wire        cpu0_mem_valid;
+	wire        cpu0_mem_instr;
+	wire        cpu0_mem_ready;
+	wire [31:0] cpu0_mem_addr;
+	wire [31:0] cpu0_mem_wdata;
+	wire [3:0]  cpu0_mem_wstrb;
+	wire [31:0] cpu0_mem_rdata;
+	wire        cpu0_trace_valid;
+	wire [35:0] cpu0_trace_data;
+
+	wire        cpu1_trap;
+	wire        cpu1_mem_valid;
+	wire        cpu1_mem_instr;
+	wire        cpu1_mem_ready;
+	wire [31:0] cpu1_mem_addr;
+	wire [31:0] cpu1_mem_wdata;
+	wire [3:0]  cpu1_mem_wstrb;
+	wire [31:0] cpu1_mem_rdata;
+	wire        cpu1_trace_valid;
+	wire [35:0] cpu1_trace_data;
+
+	wire        mem_ready;
+	wire [31:0] mem_rdata;
+
+	assign mem_ready = cpu0_mem_valid && cpu1_mem_valid;
+	assign mem_rdata = mem_rdata_in;
+
+	assign cpu0_mem_ready = mem_ready;
+	assign cpu0_mem_rdata = mem_rdata;
+
+	assign cpu1_mem_ready = mem_ready;
+	assign cpu1_mem_rdata = mem_rdata;
+
+	reg [ 2:0] trace_balance = 3'b010;
+	reg [35:0] trace_buffer_cpu0 = 0, trace_buffer_cpu1 = 0;
+
+	always @(posedge clk) begin
+		if (resetn) begin
+			if (cpu0_trace_valid)
+				trace_buffer_cpu0 <= cpu0_trace_data;
+
+			if (cpu1_trace_valid)
+				trace_buffer_cpu1 <= cpu1_trace_data;
+
+			if (cpu0_trace_valid && !cpu1_trace_valid)
+				trace_balance <= trace_balance << 1;
+
+			if (!cpu0_trace_valid && cpu1_trace_valid)
+				trace_balance <= trace_balance >> 1;
+		end
+	end
+
+	always @* begin
+		if (resetn && cpu0_mem_ready) begin
+			assert(cpu0_mem_addr == cpu1_mem_addr);
+			assert(cpu0_mem_wstrb == cpu1_mem_wstrb);
+			if (cpu0_mem_wstrb[3]) assert(cpu0_mem_wdata[31:24] == cpu1_mem_wdata[31:24]);
+			if (cpu0_mem_wstrb[2]) assert(cpu0_mem_wdata[23:16] == cpu1_mem_wdata[23:16]);
+			if (cpu0_mem_wstrb[1]) assert(cpu0_mem_wdata[15: 8] == cpu1_mem_wdata[15: 8]);
+			if (cpu0_mem_wstrb[0]) assert(cpu0_mem_wdata[ 7: 0] == cpu1_mem_wdata[ 7: 0]);
+		end
+		if (trace_balance == 3'b010) begin
+			assert(trace_buffer_cpu0 == trace_buffer_cpu1);
+		end
+	end
+
+	picorv32 #(
+		.ENABLE_COUNTERS(0),
+		.REGS_INIT_ZERO(1),
+		.COMPRESSED_ISA(1),
+		.ENABLE_TRACE(1),
+
+		.TWO_STAGE_SHIFT(0),
+		.ENABLE_PCPI(1)
+	) cpu0 (
+		.clk         (clk             ),
+		.resetn      (resetn          ),
+		.trap        (cpu0_trap       ),
+		.mem_valid   (cpu0_mem_valid  ),
+		.mem_instr   (cpu0_mem_instr  ),
+		.mem_ready   (cpu0_mem_ready  ),
+		.mem_addr    (cpu0_mem_addr   ),
+		.mem_wdata   (cpu0_mem_wdata  ),
+		.mem_wstrb   (cpu0_mem_wstrb  ),
+		.mem_rdata   (cpu0_mem_rdata  ),
+		.pcpi_wr     (pcpi_wr         ),
+		.pcpi_rd     (pcpi_rd         ),
+		.pcpi_wait   (pcpi_wait       ),
+		.pcpi_ready  (pcpi_ready      ),
+		.trace_valid (cpu0_trace_valid),
+		.trace_data  (cpu0_trace_data )
+	);
+
+	picorv32 #(
+		.ENABLE_COUNTERS(0),
+		.REGS_INIT_ZERO(1),
+		.COMPRESSED_ISA(1),
+		.ENABLE_TRACE(1),
+
+		.TWO_STAGE_SHIFT(1),
+		.TWO_CYCLE_COMPARE(1),
+		.TWO_CYCLE_ALU(1)
+	) cpu1 (
+		.clk         (clk             ),
+		.resetn      (resetn          ),
+		.trap        (cpu1_trap       ),
+		.mem_valid   (cpu1_mem_valid  ),
+		.mem_instr   (cpu1_mem_instr  ),
+		.mem_ready   (cpu1_mem_ready  ),
+		.mem_addr    (cpu1_mem_addr   ),
+		.mem_wdata   (cpu1_mem_wdata  ),
+		.mem_wstrb   (cpu1_mem_wstrb  ),
+		.mem_rdata   (cpu1_mem_rdata  ),
+		.trace_valid (cpu1_trace_valid),
+		.trace_data  (cpu1_trace_data )
+	);
+endmodule