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Added techmap support for _TECHMAP_CONNMAP_*_

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This commit is contained in:
Clifford Wolf 2014-02-18 19:23:32 +01:00
parent 02e6f2c5be
commit a71d09421d
1 changed files with 39 additions and 0 deletions
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39
passes/techmap/techmap.cc
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@ -271,6 +271,37 @@ struct TechmapWorker
parameters[stringf("\\_TECHMAP_CONSTVAL_%s_", RTLIL::id2cstr(conn.first))] = RTLIL::SigSpec(v).as_const();
}
}
int unique_bit_id_counter = 0;
std::map<RTLIL::SigBit, int> unique_bit_id;
unique_bit_id[RTLIL::State::S0] = unique_bit_id_counter++;
unique_bit_id[RTLIL::State::S1] = unique_bit_id_counter++;
unique_bit_id[RTLIL::State::Sx] = unique_bit_id_counter++;
unique_bit_id[RTLIL::State::Sz] = unique_bit_id_counter++;
for (auto conn : cell->connections)
if (tpl->avail_parameters.count(stringf("\\_TECHMAP_CONNMAP_%s_", RTLIL::id2cstr(conn.first))) != 0) {
for (auto &bit : sigmap(conn.second).to_sigbit_vector())
if (unique_bit_id.count(bit) == 0)
unique_bit_id[bit] = unique_bit_id_counter++;
}
int bits = 0;
for (int i = 0; i < 32; i++)
if (((unique_bit_id_counter-1) & (1 << i)) != 0)
bits = i;
if (tpl->avail_parameters.count("\\_TECHMAP_BITS_CONNMAP_"))
parameters["\\_TECHMAP_BITS_CONNMAP_"] = bits;
for (auto conn : cell->connections)
if (tpl->avail_parameters.count(stringf("\\_TECHMAP_CONNMAP_%s_", RTLIL::id2cstr(conn.first))) != 0) {
RTLIL::Const value;
for (auto &bit : sigmap(conn.second).to_sigbit_vector()) {
RTLIL::Const chunk(unique_bit_id.at(bit), bits);
value.bits.insert(value.bits.end(), chunk.bits.begin(), chunk.bits.end());
}
parameters[stringf("\\_TECHMAP_CONNMAP_%s_", RTLIL::id2cstr(conn.first))] = value;
}
}
std::pair<RTLIL::IdString, std::map<RTLIL::IdString, RTLIL::Const>> key(tpl_name, parameters);
@ -468,6 +499,14 @@ struct TechmapPass : public Pass {
log(" former has a 1-bit for each constant input bit and the latter has the\n");
log(" value for this bit. The unused bits of the latter are set to undef (x).\n");
log("\n");
log(" _TECHMAP_BITS_CONNMAP_\n");
log(" _TECHMAP_CONNMAP_<port-name>_\n");
log(" For an N-bit port, the _TECHMAP_CONNMAP_<port-name>_ parameter, if it\n");
log(" exists, will be set to an N*_TECHMAP_BITS_CONNMAP_ bit vector containing\n");
log(" N words (of _TECHMAP_BITS_CONNMAP_ bits each) that assign each single\n");
log(" bit driver a unique id. The values 0-3 are reserved for 0, 1, x, and z.\n");
log(" This can be used to detect shorted inputs.\n");
log("\n");
log("When a module in the map file has a parameter where the according cell in the\n");
log("design has a port, the module from the map file is only used if the port in\n");
log("the design is connected to a constant value. The parameter is then set to the\n");