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rmports: Now remove ports from cell instances if we optimized them out of that cell

This commit is contained in:
Andrew Zonenberg 2017-08-14 11:44:05 -07:00
parent 0ee27d0226
commit 15e41d6363
1 changed files with 35 additions and 2 deletions
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37
passes/opt/rmports.cc
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@ -43,12 +43,44 @@ struct RmportsPassPass : public Pass {
{
log_header(design, "Executing RMPORTS pass (remove top level ports with no connections).\n");
//The set of ports we removed
std::map< RTLIL::IdString, std::set<RTLIL::IdString> > removed_ports;
//Find all of the unused ports, and remove them from that module
auto modules = design->selected_modules();
for(auto mod : modules)
ProcessModule(mod);
ScanModule(mod, removed_ports);
//Remove the unused ports from all instances of those modules
for(auto mod : modules)
CleanupModule(mod, removed_ports);
}
void ProcessModule(RTLIL::Module* module)
void CleanupModule(RTLIL::Module* module, std::map< RTLIL::IdString, std::set<RTLIL::IdString> >& removed_ports)
{
log("Removing now-unused cell ports in module %s\n", module->name.c_str());
auto cells = module->cells();
for(auto cell : cells)
{
if(removed_ports.find(cell->type) == removed_ports.end())
{
//log(" Not touching instance \"%s\" because we didn't remove any ports from module \"%s\"\n",
// cell->name.c_str(), cell->type.c_str());
continue;
}
auto ports_to_remove = removed_ports[cell->type];
for(auto p : ports_to_remove)
{
log(" Removing port \"%s\" from instance \"%s\"\n",
p.c_str(), cell->type.c_str());
cell->unsetPort(p);
}
}
}
void ScanModule(RTLIL::Module* module, std::map< RTLIL::IdString, std::set<RTLIL::IdString> >& removed_ports)
{
log("Finding unconnected ports in module %s\n", module->name.c_str());
@ -118,6 +150,7 @@ struct RmportsPassPass : public Pass {
for(auto port : unused_ports)
{
log(" removing unused port %s\n", port.c_str());
removed_ports[module->name].emplace(port);
//Remove from ports list
for(size_t i=0; i<module->ports.size(); i++)