[FIFO] improve C++ FIFO sizing template

src/finn/qnn-data/cpp/verilator_fifosim.cpp

@@ -26,12 +26,6 @@ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
-/*
-verilator -Wno-fatal -Mdir .  -y /data/finn/sickag/vivado_stitch_proj_k9817tc7 --CFLAGS "--std=c++11" -O3 --x-assign fast --x-initial fast --noassert --cc finn_design_wrapper.v --top-module finn_design_wrapper --exe sim-semseg.cpp --threads 4
-
-make OPT_FAST="-O3 -march=native" -j4 -C $(pwd) -f Vfinn_design_wrapper.mk Vfinn_design_wrapper
-*/
-
 #include <iostream>
 #include <fstream>
 #include <cstddef>
@@ -58,6 +52,7 @@ return main_time;
 extern "C" { //Open an extern C closed below
 Vfinn_design_wrapper* construct() {
     Verilated::commandArgs(0, (const char**) nullptr);
+    //Verilated::traceEverOn(true);
     Vfinn_design_wrapper* top = new Vfinn_design_wrapper();
     return top;
 }
@@ -73,6 +68,27 @@ int destruct(Vfinn_design_wrapper* top) {
     }
     return 0;
 }
+
+VerilatedVcdC* tfp;
+VerilatedVcdC* start_vcd_trace(Vfinn_design_wrapper* top, const char* filename) {
+    VerilatedVcdC* tfp = new VerilatedVcdC;
+    top->trace(tfp, 99);
+    tfp->open(filename);
+    return tfp;
+}
+int add_to_vcd_trace(VerilatedVcdC* tfp, int time) {
+    tfp->dump(time);
+    return 0;
+}
+int flush_vcd_trace(VerilatedVcdC* tfp) {
+    tfp->flush();
+    return 0;
+}
+int stop_vcd_trace(VerilatedVcdC* tfp) {
+    tfp->close();
+    return 0;
+}
+
 }
 
 // end of code taken from pyverilator_wrapper.cpp generated by PyVerilator
@@ -80,10 +96,13 @@ int destruct(Vfinn_design_wrapper* top) {
 inline void toggle_clk() {
     eval(top);
     top->ap_clk = 1;
+    //add_to_vcd_trace(tfp, main_time);
     eval(top);
     top->ap_clk = 0;
+    //add_to_vcd_trace(tfp, main_time);
 }
 
+
 void reset() {
     top->ap_rst_n = 0;
     for(unsigned i = 0; i < 10; i++) {
@@ -94,7 +113,7 @@ void reset() {
 
 int main(int argc, char *argv[]) {
     top = construct();
-
+    //tfp = start_vcd_trace(top, "trace.vcd");
     unsigned n_iters_per_input = @ITERS_PER_INPUT@;
     unsigned n_iters_per_output = @ITERS_PER_OUTPUT@;
     unsigned n_inputs = @N_INPUTS@;
@@ -143,6 +162,9 @@ int main(int argc, char *argv[]) {
         exit_criterion = ((n_in_txns >= n_iters_per_input * n_inputs) && (n_out_txns >= n_iters_per_output * n_inputs)) || (iters > max_iters);
     }
 
+    //flush_vcd_trace(tfp);
+    //stop_vcd_trace(tfp);
+
     cout << "Simulation finished" << endl;
     cout << "Number of inputs consumed " << n_in_txns << endl;
     cout << "Number of outputs produced " << n_out_txns << endl;