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Add gatesi_mode in BLIF format

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This commit is contained in:
kamay 2025-03-04 11:31:59 +01:00
parent 763001885f
commit e0077b188d
2 changed files with 46 additions and 7 deletions
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32
backends/blif/blif.cc
View file

@ -44,6 +44,7 @@ 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;
@ -51,7 +52,7 @@ struct BlifDumperConfig
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
@ -118,16 +119,21 @@ struct BlifDumper
return str;
}
const std::string str_init(RTLIL::SigBit sig)
template <bool Space = true> const std::string str_init(RTLIL::SigBit sig)
{
sigmap.apply(sig);
if (init_bits.count(sig) == 0)
return " 2";
if (init_bits.count(sig) == 0) {
if constexpr (Space)
return " 2";
else
return "2";
}
string str = stringf(" %d", init_bits.at(sig));
return str;
if constexpr (Space)
return stringf(" %d", init_bits.at(sig));
else
return stringf("%d", init_bits.at(sig));
}
const char *subckt_or_gate(std::string cell_type)
@ -469,6 +475,11 @@ struct BlifDumper
f << stringf(".names %s %s\n1 1\n", str(rhs_bit), str(lhs_bit));
}
if (config->gatesi_mode) {
for (auto &&init_bit : init_bits)
f << stringf(".gateinit %s=%s\n", str(init_bit.first), str_init<false>(init_bit.first));
}
f << stringf(".end\n");
}
@ -550,6 +561,9 @@ 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(" write initial bit(s) with .gateinit 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
{
@ -640,6 +654,10 @@ 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);

21
frontends/blif/blifparse.cc
View file

@ -470,6 +470,27 @@ void parse_blif(RTLIL::Design *design, std::istream &f, IdString dff_name, bool
continue;
}
if (!strcmp(cmd, ".gateinit"))
{
char *p = strtok(NULL, " \t\r\n");
if (p == NULL)
goto error;
char *n = strtok(p, "=");
char *init = strtok(NULL, "=");
if (n == NULL || init == NULL)
goto error;
if (init[0] != '0' && init[0] != '1')
goto error;
if (blif_wire(n)->attributes.find(ID::init) == blif_wire(n)->attributes.end())
blif_wire(n)->attributes.emplace(ID::init, Const(init[0] == '1' ? 1 : 0, 1));
else
blif_wire(n)->attributes[ID::init] = Const(init[0] == '1' ? 1 : 0, 1);
continue;
}
if (!strcmp(cmd, ".names"))
{
char *p;