diff options
| -rw-r--r-- | fpga_interchange/fpga_interchange.cpp | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/fpga_interchange/fpga_interchange.cpp b/fpga_interchange/fpga_interchange.cpp index 92d409f9..1c6e6ce8 100644 --- a/fpga_interchange/fpga_interchange.cpp +++ b/fpga_interchange/fpga_interchange.cpp @@ -544,7 +544,9 @@ void FpgaInterchange::write_physical_netlist(const Context * ctx, const std::str for(auto & net_pair : ctx->nets) { auto &net = *net_pair.second; - if (net.users.empty()) + // Remove disconnected nets that do not have any users + auto net_name = std::string(net.name.c_str(ctx)); + if (net.users.empty() && net_name.rfind("$frontend$", 0) == 0) nets_to_remove++; } @@ -553,7 +555,8 @@ void FpgaInterchange::write_physical_netlist(const Context * ctx, const std::str for(auto & net_pair : ctx->nets) { auto &net = *net_pair.second; - if (net.users.empty()) + auto net_name = std::string(net.name.c_str(ctx)); + if (net.users.empty() && net_name.rfind("$frontend$", 0) == 0) continue; const CellInfo *driver_cell = net.driver.cell; @@ -1087,6 +1090,14 @@ ModuleReader::ModuleReader(const LogicalNetlistImpl *root, if(iter == net_indicies.end()) { PortKey port_key = port_connections.first; auto port = ports[port_key.port_idx]; + + // Disconnected outputs should be marked, so to be ignored when + // writing the physical netlist. + // Skipping these nets lets the basic frontend to assign a default + // name that starts with $frontend$. + if (port.getDir() == LogicalNetlist::Netlist::Direction::OUTPUT) + continue; + disconnected_nets[net_idx] = stringf("%s.%d", root->strings.at(port.getName()).c_str(), i); } } |