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Add gatesi_mode to init gates under gates_mode in BLIF format #4928

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Add gatesi_mode to init gates under gates_mode in BLIF format #4928

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20 changes: 18 additions & 2 deletions backends/blif/blif.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -44,14 +44,15 @@ struct BlifDumperConfig
bool iattr_mode;
bool blackbox_mode;
bool noalias_mode;
bool gatesi_mode;

std::string buf_type, buf_in, buf_out;
std::map<RTLIL::IdString, std::pair<RTLIL::IdString, RTLIL::IdString>> unbuf_types;
std::string true_type, true_out, false_type, false_out, undef_type, undef_out;

BlifDumperConfig() : icells_mode(false), conn_mode(false), impltf_mode(false), gates_mode(false),
cname_mode(false), iname_mode(false), param_mode(false), attr_mode(false), iattr_mode(false),
blackbox_mode(false), noalias_mode(false) { }
blackbox_mode(false), noalias_mode(false), gatesi_mode(false) { }
};

struct BlifDumper
Expand Down Expand Up @@ -229,6 +230,8 @@ struct BlifDumper
if (cell->type == ID($scopeinfo))
continue;

auto gate_init = cell->hasPort(ID::Q) ? str_init(cell->getPort(ID::Q)) : std::string("");

if (config->unbuf_types.count(cell->type)) {
auto portnames = config->unbuf_types.at(cell->type);
f << stringf(".names %s %s\n1 1\n",
Expand Down Expand Up @@ -410,7 +413,13 @@ struct BlifDumper
goto internal_cell;
}

f << stringf(".%s %s", subckt_or_gate(cell->type.str()), str(cell->type).c_str());
if (config->gatesi_mode && config->gates_mode) {
f << stringf(".%s %s%s", subckt_or_gate(cell->type.str()), str(cell->type).c_str(), gate_init.c_str());
}
else {
f << stringf(".%s %s", subckt_or_gate(cell->type.str()), str(cell->type).c_str());
}

for (auto &conn : cell->connections())
{
if (conn.second.size() == 1) {
Expand Down Expand Up @@ -550,6 +559,9 @@ struct BlifBackend : public Backend {
log(" -impltf\n");
log(" do not write definitions for the $true, $false and $undef wires.\n");
log("\n");
log(" -gatesi\n");
log(" append initial bit(s) for gates that needs to be initialized.\n");
log("\n");
}
void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) override
{
Expand Down Expand Up @@ -640,6 +652,10 @@ struct BlifBackend : public Backend {
config.noalias_mode = true;
continue;
}
if (args[argidx] == "-gatesi") {
config.gatesi_mode = true;
continue;
}
break;
}
extra_args(f, filename, args, argidx);
Expand Down