mirror of https://github.com/YosysHQ/yosys.git
Optimise some more
This commit is contained in:
parent
d09d4e0706
commit
bc22e2e3ee
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@ -38,8 +38,8 @@ YOSYS_NAMESPACE_BEGIN
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struct ConstEvalAig
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struct ConstEvalAig
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{
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{
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RTLIL::Module *module;
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RTLIL::Module *module;
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dict<RTLIL::SigBit, RTLIL::Const> values_map;
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dict<RTLIL::SigBit, RTLIL::State> values_map;
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SigSet<RTLIL::Cell*> sig2driver;
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dict<RTLIL::SigBit, RTLIL::Cell*> sig2driver;
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dict<SigBit, pool<RTLIL::SigBit>> sig2deps;
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dict<SigBit, pool<RTLIL::SigBit>> sig2deps;
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ConstEvalAig(RTLIL::Module *module) : module(module)
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ConstEvalAig(RTLIL::Module *module) : module(module)
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@ -52,8 +52,10 @@ struct ConstEvalAig
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if (!ct.cell_known(it.second->type))
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if (!ct.cell_known(it.second->type))
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continue;
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continue;
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for (auto &it2 : it.second->connections())
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for (auto &it2 : it.second->connections())
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if (ct.cell_output(it.second->type, it2.first))
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if (ct.cell_output(it.second->type, it2.first)) {
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sig2driver.insert(it2.second, it.second);
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auto r = sig2driver.insert(std::make_pair(it2.second, it.second));
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log_assert(r.second);
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}
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}
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}
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}
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}
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@ -63,18 +65,19 @@ struct ConstEvalAig
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sig2deps.clear();
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sig2deps.clear();
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}
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}
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void set(RTLIL::SigSpec sig, RTLIL::Const value)
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void set(RTLIL::SigBit sig, RTLIL::State value)
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{
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{
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#ifndef NDEBUG
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auto it = values_map.find(sig);
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auto it = values_map.find(sig);
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RTLIL::SigSpec current_val;
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#ifndef NDEBUG
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if (it != values_map.end())
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if (it != values_map.end()) {
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current_val = it->second;
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RTLIL::State current_val = it->second;
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for (int i = 0; i < GetSize(current_val); i++)
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log_assert(current_val == value);
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log_assert(current_val[i].wire != NULL || current_val[i] == value.bits[i]);
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}
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#endif
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#endif
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for (int i = 0; i < GetSize(sig); i++)
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if (it != values_map.end())
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values_map[sig[i]] = value[i];
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it->second = value;
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else
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values_map[sig] = value;
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}
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}
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void set_incremental(RTLIL::SigSpec sig, RTLIL::Const value)
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void set_incremental(RTLIL::SigSpec sig, RTLIL::Const value)
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@ -84,7 +87,7 @@ struct ConstEvalAig
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for (int i = 0; i < GetSize(sig); i++) {
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for (int i = 0; i < GetSize(sig); i++) {
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auto it = values_map.find(sig[i]);
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auto it = values_map.find(sig[i]);
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if (it != values_map.end()) {
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if (it != values_map.end()) {
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RTLIL::SigSpec current_val = it->second;
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RTLIL::State current_val = it->second;
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if (current_val != value[i])
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if (current_val != value[i])
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for (auto dep : sig2deps[sig[i]])
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for (auto dep : sig2deps[sig[i]])
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values_map.erase(dep);
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values_map.erase(dep);
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@ -99,40 +102,34 @@ struct ConstEvalAig
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{
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{
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sig2deps[output].insert(output);
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sig2deps[output].insert(output);
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std::set<RTLIL::Cell*> driver_cells;
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RTLIL::Cell *cell = sig2driver.at(output);
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sig2driver.find(output, driver_cells);
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RTLIL::SigBit sig_a = cell->getPort("\\A");
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for (auto cell : driver_cells) {
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sig2deps[sig_a].insert(sig2deps[output].begin(), sig2deps[output].end());
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RTLIL::SigBit sig_a = cell->getPort("\\A");
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if (!inputs.count(sig_a))
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sig2deps[sig_a].insert(sig2deps[output].begin(), sig2deps[output].end());
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compute_deps(sig_a, inputs);
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if (!inputs.count(sig_a))
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compute_deps(sig_a, inputs);
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if (cell->type == "$_AND_") {
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if (cell->type == "$_AND_") {
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RTLIL::SigSpec sig_b = cell->getPort("\\B");
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RTLIL::SigSpec sig_b = cell->getPort("\\B");
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sig2deps[sig_b].insert(sig2deps[output].begin(), sig2deps[output].end());
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sig2deps[sig_b].insert(sig2deps[output].begin(), sig2deps[output].end());
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if (!inputs.count(sig_b))
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if (!inputs.count(sig_b))
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compute_deps(sig_b, inputs);
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compute_deps(sig_b, inputs);
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}
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else if (cell->type == "$_NOT_") {
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}
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else log_abort();
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}
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}
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else if (cell->type == "$_NOT_") {
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}
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else log_abort();
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}
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}
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bool eval(RTLIL::Cell *cell)
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bool eval(RTLIL::Cell *cell)
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{
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{
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RTLIL::SigSpec sig_y = cell->getPort("\\Y");
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RTLIL::SigBit sig_y = cell->getPort("\\Y");
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auto it = values_map.find(sig_y);
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if (values_map.count(sig_y))
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if (it != values_map.end())
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sig_y = it->second;
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if (sig_y.is_fully_const())
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return true;
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return true;
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RTLIL::SigSpec sig_a = cell->getPort("\\A");
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RTLIL::SigBit sig_a = cell->getPort("\\A");
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if (sig_a.size() > 0 && !eval(sig_a))
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if (!eval(sig_a))
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return false;
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return false;
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RTLIL::Const eval_ret;
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RTLIL::State eval_ret = RTLIL::Sx;
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if (cell->type == "$_NOT_") {
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if (cell->type == "$_NOT_") {
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if (sig_a == RTLIL::S0) eval_ret = RTLIL::S1;
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if (sig_a == RTLIL::S0) eval_ret = RTLIL::S1;
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else if (sig_a == RTLIL::S1) eval_ret = RTLIL::S0;
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else if (sig_a == RTLIL::S1) eval_ret = RTLIL::S0;
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@ -144,20 +141,18 @@ struct ConstEvalAig
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}
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}
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{
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{
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RTLIL::SigSpec sig_b = cell->getPort("\\B");
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RTLIL::SigBit sig_b = cell->getPort("\\B");
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if (sig_b.size() > 0 && !eval(sig_b))
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if (!eval(sig_b))
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return false;
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return false;
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if (sig_b == RTLIL::S0) {
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if (sig_b == RTLIL::S0) {
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eval_ret = RTLIL::S0;
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eval_ret = RTLIL::S0;
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goto eval_end;
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goto eval_end;
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}
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}
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if (sig_a != RTLIL::State::S1 || sig_b != RTLIL::State::S1) {
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if (sig_a != RTLIL::S1 || sig_b != RTLIL::S1)
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eval_ret = RTLIL::State::Sx;
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goto eval_end;
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goto eval_end;
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}
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eval_ret = RTLIL::State::S1;
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eval_ret = RTLIL::S1;
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}
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}
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}
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}
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else log_abort();
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else log_abort();
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@ -167,25 +162,23 @@ eval_end:
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return true;
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return true;
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}
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}
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bool eval(RTLIL::SigSpec &sig)
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bool eval(RTLIL::SigBit &sig)
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{
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{
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auto it = values_map.find(sig);
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auto it = values_map.find(sig);
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if (it != values_map.end())
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if (it != values_map.end()) {
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sig = it->second;
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sig = it->second;
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if (sig.is_fully_const())
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return true;
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return true;
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}
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std::set<RTLIL::Cell*> driver_cells;
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RTLIL::Cell *cell = sig2driver.at(sig);
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sig2driver.find(sig, driver_cells);
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if (!eval(cell))
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for (auto cell : driver_cells)
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return false;
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if (!eval(cell))
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return false;
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it = values_map.find(sig);
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it = values_map.find(sig);
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if (it != values_map.end())
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if (it != values_map.end()) {
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sig = it->second;
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sig = it->second;
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if (sig.is_fully_const())
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return true;
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return true;
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}
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return false;
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return false;
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}
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}
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@ -411,9 +404,11 @@ void AigerReader::parse_xaiger()
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for (int j = 0; j < (1 << cutLeavesM); ++j) {
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for (int j = 0; j < (1 << cutLeavesM); ++j) {
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int gray = j ^ (j >> 1);
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int gray = j ^ (j >> 1);
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ce.set_incremental(input_sig, RTLIL::Const{gray, static_cast<int>(cutLeavesM)});
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ce.set_incremental(input_sig, RTLIL::Const{gray, static_cast<int>(cutLeavesM)});
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RTLIL::SigSpec o(output_sig);
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RTLIL::SigBit o(output_sig);
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ce.eval(o);
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bool success = ce.eval(o);
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lut_mask[gray] = o.as_const()[0];
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log_assert(success);
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log_assert(o.wire == nullptr);
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lut_mask[gray] = o.data;
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}
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}
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RTLIL::Cell *output_cell = module->cell(stringf("\\__%d__$and", rootNodeID));
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RTLIL::Cell *output_cell = module->cell(stringf("\\__%d__$and", rootNodeID));
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log_assert(output_cell);
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log_assert(output_cell);
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