diff options
Diffstat (limited to 'passes/techmap/recover_reduce.cc')
-rw-r--r-- | passes/techmap/recover_reduce.cc | 380 |
1 files changed, 190 insertions, 190 deletions
diff --git a/passes/techmap/recover_reduce.cc b/passes/techmap/recover_reduce.cc index dbd61b366..873b8ab26 100644 --- a/passes/techmap/recover_reduce.cc +++ b/passes/techmap/recover_reduce.cc @@ -24,196 +24,196 @@ USING_YOSYS_NAMESPACE PRIVATE_NAMESPACE_BEGIN struct RecoverReduceCorePass : public Pass { - enum GateType { - And, - Or, - Xor - }; - - RecoverReduceCorePass() : Pass("recover_reduce_core", "converts gate chains into $reduce_*") { } - virtual void help() - { - // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| - log("\n"); - log(" recover_reduce_core\n"); - log("\n"); - log("converts gate chains into $reduce_*\n"); - log("\n"); - log("This performs the core step of the recover_reduce command. This step recognizes\n"); - log("chains of gates found by the previous steps and converts these chains into one\n"); - log("logical cell.\n"); - log("\n"); - } - virtual void execute(std::vector<std::string> args, RTLIL::Design *design) - { - (void)args; - - for (auto module : design->selected_modules()) - { - SigMap sigmap(module); - - // Index all of the nets in the module - dict<SigBit, Cell*> sig_to_driver; - dict<SigBit, pool<Cell*>> sig_to_sink; - for (auto cell : module->selected_cells()) - { - for (auto &conn : cell->connections()) - { - if (cell->output(conn.first)) - for (auto bit : sigmap(conn.second)) - sig_to_driver[bit] = cell; - - if (cell->input(conn.first)) - { - for (auto bit : sigmap(conn.second)) - { - if (sig_to_sink.count(bit) == 0) - sig_to_sink[bit] = pool<Cell*>(); - sig_to_sink[bit].insert(cell); - } - } - } - } - - // Need to check if any wires connect to module ports - pool<SigBit> port_sigs; - for (auto wire : module->selected_wires()) - if (wire->port_input || wire->port_output) - for (auto bit : sigmap(wire)) - port_sigs.insert(bit); - - // Actual logic starts here - pool<Cell*> consumed_cells; - for (auto cell : module->selected_cells()) - { - if (consumed_cells.count(cell)) - continue; - - GateType gt; - - if (cell->type == "$_AND_") - gt = GateType::And; - else if (cell->type == "$_OR_") - gt = GateType::Or; - else if (cell->type == "$_XOR_") - gt = GateType::Xor; - else - continue; - - log("Working on cell %s...\n", cell->name.c_str()); - - // Go all the way to the sink - Cell* head_cell = cell; - Cell* x = cell; - while (true) - { - if (!((x->type == "$_AND_" && gt == GateType::And) || - (x->type == "$_OR_" && gt == GateType::Or) || - (x->type == "$_XOR_" && gt == GateType::Xor))) - break; - - head_cell = x; - - auto y = sigmap(x->getPort("\\Y")); - log_assert(y.size() == 1); - - // Should only continue if there is one fanout back into a cell (not to a port) - if (sig_to_sink[y[0]].size() != 1) - break; - - x = *sig_to_sink[y[0]].begin(); - } - - log(" Head cell is %s\n", head_cell->name.c_str()); - - pool<Cell*> cur_supercell; - std::deque<Cell*> bfs_queue = {head_cell}; - while (bfs_queue.size()) - { - Cell* x = bfs_queue.front(); - bfs_queue.pop_front(); - - cur_supercell.insert(x); - - auto a = sigmap(x->getPort("\\A")); - log_assert(a.size() == 1); - // Must have only one sink - // XXX: Check that it is indeed this node? - if (sig_to_sink[a[0]].size() + port_sigs.count(a[0]) == 1) - { - Cell* cell_a = sig_to_driver[a[0]]; - if (((cell_a->type == "$_AND_" && gt == GateType::And) || - (cell_a->type == "$_OR_" && gt == GateType::Or) || - (cell_a->type == "$_XOR_" && gt == GateType::Xor))) - { - // The cell here is the correct type, and it's definitely driving only - // this current cell. - bfs_queue.push_back(cell_a); - } - } - - auto b = sigmap(x->getPort("\\B")); - log_assert(b.size() == 1); - // Must have only one sink - // XXX: Check that it is indeed this node? - if (sig_to_sink[b[0]].size() + port_sigs.count(b[0]) == 1) - { - Cell* cell_b = sig_to_driver[b[0]]; - if (((cell_b->type == "$_AND_" && gt == GateType::And) || - (cell_b->type == "$_OR_" && gt == GateType::Or) || - (cell_b->type == "$_XOR_" && gt == GateType::Xor))) - { - // The cell here is the correct type, and it's definitely driving only - // this current cell. - bfs_queue.push_back(cell_b); - } - } - } - - log(" Cells:\n"); - for (auto x : cur_supercell) - log(" %s\n", x->name.c_str()); - - if (cur_supercell.size() > 1) - { - // Worth it to create reduce cell - log(" Creating $reduce_* cell!\n"); - - pool<SigBit> input_pool; - pool<SigBit> input_pool_intermed; - for (auto x : cur_supercell) - { - input_pool.insert(sigmap(x->getPort("\\A"))[0]); - input_pool.insert(sigmap(x->getPort("\\B"))[0]); - input_pool_intermed.insert(sigmap(x->getPort("\\Y"))[0]); - } - SigSpec input; - for (auto b : input_pool) - if (input_pool_intermed.count(b) == 0) - input.append_bit(b); - - SigBit output = sigmap(head_cell->getPort("\\Y")[0]); - - auto new_reduce_cell = module->addCell(NEW_ID, - gt == GateType::And ? "$reduce_and" : - gt == GateType::Or ? "$reduce_or" : - gt == GateType::Xor ? "$reduce_xor" : ""); - new_reduce_cell->setParam("\\A_SIGNED", 0); - new_reduce_cell->setParam("\\A_WIDTH", input.size()); - new_reduce_cell->setParam("\\Y_WIDTH", 1); - new_reduce_cell->setPort("\\A", input); - new_reduce_cell->setPort("\\Y", output); - - for (auto x : cur_supercell) - consumed_cells.insert(x); - } - } - - // Remove every cell that we've used up - for (auto cell : consumed_cells) - module->remove(cell); - } - } + enum GateType { + And, + Or, + Xor + }; + + RecoverReduceCorePass() : Pass("recover_reduce_core", "converts gate chains into $reduce_*") { } + virtual void help() + { + // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| + log("\n"); + log(" recover_reduce_core\n"); + log("\n"); + log("converts gate chains into $reduce_*\n"); + log("\n"); + log("This performs the core step of the recover_reduce command. This step recognizes\n"); + log("chains of gates found by the previous steps and converts these chains into one\n"); + log("logical cell.\n"); + log("\n"); + } + virtual void execute(std::vector<std::string> args, RTLIL::Design *design) + { + (void)args; + + for (auto module : design->selected_modules()) + { + SigMap sigmap(module); + + // Index all of the nets in the module + dict<SigBit, Cell*> sig_to_driver; + dict<SigBit, pool<Cell*>> sig_to_sink; + for (auto cell : module->selected_cells()) + { + for (auto &conn : cell->connections()) + { + if (cell->output(conn.first)) + for (auto bit : sigmap(conn.second)) + sig_to_driver[bit] = cell; + + if (cell->input(conn.first)) + { + for (auto bit : sigmap(conn.second)) + { + if (sig_to_sink.count(bit) == 0) + sig_to_sink[bit] = pool<Cell*>(); + sig_to_sink[bit].insert(cell); + } + } + } + } + + // Need to check if any wires connect to module ports + pool<SigBit> port_sigs; + for (auto wire : module->selected_wires()) + if (wire->port_input || wire->port_output) + for (auto bit : sigmap(wire)) + port_sigs.insert(bit); + + // Actual logic starts here + pool<Cell*> consumed_cells; + for (auto cell : module->selected_cells()) + { + if (consumed_cells.count(cell)) + continue; + + GateType gt; + + if (cell->type == "$_AND_") + gt = GateType::And; + else if (cell->type == "$_OR_") + gt = GateType::Or; + else if (cell->type == "$_XOR_") + gt = GateType::Xor; + else + continue; + + log("Working on cell %s...\n", cell->name.c_str()); + + // Go all the way to the sink + Cell* head_cell = cell; + Cell* x = cell; + while (true) + { + if (!((x->type == "$_AND_" && gt == GateType::And) || + (x->type == "$_OR_" && gt == GateType::Or) || + (x->type == "$_XOR_" && gt == GateType::Xor))) + break; + + head_cell = x; + + auto y = sigmap(x->getPort("\\Y")); + log_assert(y.size() == 1); + + // Should only continue if there is one fanout back into a cell (not to a port) + if (sig_to_sink[y[0]].size() != 1) + break; + + x = *sig_to_sink[y[0]].begin(); + } + + log(" Head cell is %s\n", head_cell->name.c_str()); + + pool<Cell*> cur_supercell; + std::deque<Cell*> bfs_queue = {head_cell}; + while (bfs_queue.size()) + { + Cell* x = bfs_queue.front(); + bfs_queue.pop_front(); + + cur_supercell.insert(x); + + auto a = sigmap(x->getPort("\\A")); + log_assert(a.size() == 1); + // Must have only one sink + // XXX: Check that it is indeed this node? + if (sig_to_sink[a[0]].size() + port_sigs.count(a[0]) == 1) + { + Cell* cell_a = sig_to_driver[a[0]]; + if (((cell_a->type == "$_AND_" && gt == GateType::And) || + (cell_a->type == "$_OR_" && gt == GateType::Or) || + (cell_a->type == "$_XOR_" && gt == GateType::Xor))) + { + // The cell here is the correct type, and it's definitely driving only + // this current cell. + bfs_queue.push_back(cell_a); + } + } + + auto b = sigmap(x->getPort("\\B")); + log_assert(b.size() == 1); + // Must have only one sink + // XXX: Check that it is indeed this node? + if (sig_to_sink[b[0]].size() + port_sigs.count(b[0]) == 1) + { + Cell* cell_b = sig_to_driver[b[0]]; + if (((cell_b->type == "$_AND_" && gt == GateType::And) || + (cell_b->type == "$_OR_" && gt == GateType::Or) || + (cell_b->type == "$_XOR_" && gt == GateType::Xor))) + { + // The cell here is the correct type, and it's definitely driving only + // this current cell. + bfs_queue.push_back(cell_b); + } + } + } + + log(" Cells:\n"); + for (auto x : cur_supercell) + log(" %s\n", x->name.c_str()); + + if (cur_supercell.size() > 1) + { + // Worth it to create reduce cell + log(" Creating $reduce_* cell!\n"); + + pool<SigBit> input_pool; + pool<SigBit> input_pool_intermed; + for (auto x : cur_supercell) + { + input_pool.insert(sigmap(x->getPort("\\A"))[0]); + input_pool.insert(sigmap(x->getPort("\\B"))[0]); + input_pool_intermed.insert(sigmap(x->getPort("\\Y"))[0]); + } + SigSpec input; + for (auto b : input_pool) + if (input_pool_intermed.count(b) == 0) + input.append_bit(b); + + SigBit output = sigmap(head_cell->getPort("\\Y")[0]); + + auto new_reduce_cell = module->addCell(NEW_ID, + gt == GateType::And ? "$reduce_and" : + gt == GateType::Or ? "$reduce_or" : + gt == GateType::Xor ? "$reduce_xor" : ""); + new_reduce_cell->setParam("\\A_SIGNED", 0); + new_reduce_cell->setParam("\\A_WIDTH", input.size()); + new_reduce_cell->setParam("\\Y_WIDTH", 1); + new_reduce_cell->setPort("\\A", input); + new_reduce_cell->setPort("\\Y", output); + + for (auto x : cur_supercell) + consumed_cells.insert(x); + } + } + + // Remove every cell that we've used up + for (auto cell : consumed_cells) + module->remove(cell); + } + } } RecoverReduceCorePass; PRIVATE_NAMESPACE_END |