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Added "write_blif -noalias"

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This commit is contained in:
Clifford Wolf 2016-05-06 15:05:53 +02:00
parent 126da0ad3d
commit d10dfccabb
1 changed files with 28 additions and 8 deletions
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36
backends/blif/blif.cc
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@ -41,13 +41,14 @@ struct BlifDumperConfig
bool param_mode; bool param_mode;
bool attr_mode; bool attr_mode;
bool blackbox_mode; bool blackbox_mode;
bool noalias_mode;
std::string buf_type, buf_in, buf_out; std::string buf_type, buf_in, buf_out;
std::map<RTLIL::IdString, std::pair<RTLIL::IdString, RTLIL::IdString>> unbuf_types; 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; 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), BlifDumperConfig() : icells_mode(false), conn_mode(false), impltf_mode(false), gates_mode(false),
cname_mode(false), param_mode(false), attr_mode(false), blackbox_mode(false) { } cname_mode(false), param_mode(false), attr_mode(false), blackbox_mode(false), noalias_mode(false) { }
}; };
struct BlifDumper struct BlifDumper
@ -86,6 +87,7 @@ struct BlifDumper
} }
vector<shared_str> cstr_buf; vector<shared_str> cstr_buf;
pool<SigBit> cstr_bits_seen;
const char *cstr(RTLIL::IdString id) const char *cstr(RTLIL::IdString id)
{ {
@ -99,6 +101,8 @@ struct BlifDumper
const char *cstr(RTLIL::SigBit sig) const char *cstr(RTLIL::SigBit sig)
{ {
cstr_bits_seen.insert(sig);
if (sig.wire == NULL) { if (sig.wire == NULL) {
if (sig == RTLIL::State::S0) return config->false_type == "-" ? config->false_out.c_str() : "$false"; if (sig == RTLIL::State::S0) return config->false_type == "-" ? config->false_out.c_str() : "$false";
if (sig == RTLIL::State::S1) return config->true_type == "-" ? config->true_out.c_str() : "$true"; if (sig == RTLIL::State::S1) return config->true_type == "-" ? config->true_out.c_str() : "$true";
@ -373,14 +377,21 @@ struct BlifDumper
for (auto &conn : module->connections()) for (auto &conn : module->connections())
for (int i = 0; i < conn.first.size(); i++) for (int i = 0; i < conn.first.size(); i++)
if (config->conn_mode) {
f << stringf(".conn %s %s\n", cstr(conn.second.extract(i, 1)), cstr(conn.first.extract(i, 1))); SigBit lhs_bit = conn.first[i];
else if (!config->buf_type.empty()) SigBit rhs_bit = conn.second[i];
f << stringf(".%s %s %s=%s %s=%s\n", subckt_or_gate(config->buf_type), config->buf_type.c_str(), config->buf_in.c_str(), cstr(conn.second.extract(i, 1)),
config->buf_out.c_str(), cstr(conn.first.extract(i, 1)));
else
f << stringf(".names %s %s\n1 1\n", cstr(conn.second.extract(i, 1)), cstr(conn.first.extract(i, 1)));
if (config->noalias_mode && cstr_bits_seen.count(lhs_bit) == 0)
continue;
if (config->conn_mode)
f << stringf(".conn %s %s\n", cstr(rhs_bit), cstr(lhs_bit));
else if (!config->buf_type.empty())
f << stringf(".%s %s %s=%s %s=%s\n", subckt_or_gate(config->buf_type), config->buf_type.c_str(),
config->buf_in.c_str(), cstr(rhs_bit), config->buf_out.c_str(), cstr(lhs_bit));
else
f << stringf(".names %s %s\n1 1\n", cstr(rhs_bit), cstr(lhs_bit));
}
f << stringf(".end\n"); f << stringf(".end\n");
} }
@ -420,6 +431,11 @@ struct BlifBackend : public Backend {
log(" the wire name to be used for the constant signal and no cell driving\n"); log(" the wire name to be used for the constant signal and no cell driving\n");
log(" that wire is generated.\n"); log(" that wire is generated.\n");
log("\n"); log("\n");
log(" -noalias\n");
log(" if a net name is aliasing another net name, then by default a net\n");
log(" without fanout is created that is driven by the other net. This option\n");
log(" suppresses the generation of this nets without fanout.\n");
log("\n");
log("The following options can be useful when the generated file is not going to be\n"); log("The following options can be useful when the generated file is not going to be\n");
log("read by a BLIF parser but a custom tool. It is recommended to not name the output\n"); log("read by a BLIF parser but a custom tool. It is recommended to not name the output\n");
log("file *.blif when any of this options is used.\n"); log("file *.blif when any of this options is used.\n");
@ -529,6 +545,10 @@ struct BlifBackend : public Backend {
config.impltf_mode = true; config.impltf_mode = true;
continue; continue;
} }
if (args[argidx] == "-noalias") {
config.noalias_mode = true;
continue;
}
break; break;
} }
extra_args(f, filename, args, argidx); extra_args(f, filename, args, argidx);