diff options
Diffstat (limited to 'passes/techmap/abc9_ops.cc')
| -rw-r--r-- | passes/techmap/abc9_ops.cc | 486 |
1 files changed, 486 insertions, 0 deletions
diff --git a/passes/techmap/abc9_ops.cc b/passes/techmap/abc9_ops.cc new file mode 100644 index 000000000..019868adb --- /dev/null +++ b/passes/techmap/abc9_ops.cc @@ -0,0 +1,486 @@ +/* + * yosys -- Yosys Open SYnthesis Suite + * + * Copyright (C) 2012 Clifford Wolf <clifford@clifford.at> + * 2019 Eddie Hung <eddie@fpgeh.com> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + */ + +#include "kernel/register.h" +#include "kernel/sigtools.h" +#include "kernel/utils.h" + +USING_YOSYS_NAMESPACE +PRIVATE_NAMESPACE_BEGIN + +void break_scc(RTLIL::Module *module) +{ + // For every unique SCC found, (arbitrarily) find the first + // cell in the component, and convert all wires driven by + // its output ports into a new PO, and drive its previous + // sinks with a new PI + pool<RTLIL::Const> ids_seen; + for (auto cell : module->selected_cells()) { + auto it = cell->attributes.find(ID(abc9_scc_id)); + if (it == cell->attributes.end()) + continue; + auto r = ids_seen.insert(it->second); + cell->attributes.erase(it); + if (!r.second) + continue; + for (auto &c : cell->connections_) { + if (c.second.is_fully_const()) continue; + if (cell->output(c.first)) { + SigBit b = c.second.as_bit(); + Wire *w = b.wire; + if (w->port_input) { + // In this case, hopefully the loop break has been already created + // Get the non-prefixed wire + Wire *wo = module->wire(stringf("%s.abco", b.wire->name.c_str())); + log_assert(wo != nullptr); + log_assert(wo->port_output); + log_assert(b.offset < GetSize(wo)); + c.second = RTLIL::SigBit(wo, b.offset); + } + else { + // Create a new output/input loop break + w->port_input = true; + w = module->wire(stringf("%s.abco", w->name.c_str())); + if (!w) { + w = module->addWire(stringf("%s.abco", b.wire->name.c_str()), GetSize(b.wire)); + w->port_output = true; + } + else { + log_assert(w->port_input); + log_assert(b.offset < GetSize(w)); + } + w->set_bool_attribute(ID(abc9_scc_break)); + c.second = RTLIL::SigBit(w, b.offset); + } + } + } + } + + module->fixup_ports(); +} + +void unbreak_scc(RTLIL::Module *module) +{ + // Now 'unexpose' those wires by undoing + // the expose operation -- remove them from PO/PI + // and re-connecting them back together + for (auto wire : module->wires()) { + auto it = wire->attributes.find(ID(abc9_scc_break)); + if (it != wire->attributes.end()) { + wire->attributes.erase(it); + log_assert(wire->port_output); + wire->port_output = false; + std::string name = wire->name.str(); + RTLIL::Wire *i_wire = module->wire(name.substr(0, GetSize(name) - 5)); + log_assert(i_wire); + log_assert(i_wire->port_input); + i_wire->port_input = false; + module->connect(i_wire, wire); + } + } + module->fixup_ports(); +} + +void prep_dff(RTLIL::Module *module) +{ + auto design = module->design; + log_assert(design); + + SigMap assign_map(module); + + typedef SigSpec clkdomain_t; + dict<clkdomain_t, int> clk_to_mergeability; + + for (auto cell : module->selected_cells()) { + auto inst_module = design->module(cell->type); + if (!inst_module || !inst_module->attributes.count("\\abc9_flop") + || cell->get_bool_attribute("\\abc9_keep")) + continue; + + Wire *abc9_clock_wire = module->wire(stringf("%s.$abc9_clock", cell->name.c_str())); + if (abc9_clock_wire == NULL) + log_error("'%s$abc9_clock' is not a wire present in module '%s'.\n", cell->name.c_str(), log_id(module)); + SigSpec abc9_clock = assign_map(abc9_clock_wire); + + clkdomain_t key(abc9_clock); + + auto r = clk_to_mergeability.insert(std::make_pair(abc9_clock, clk_to_mergeability.size() + 1)); + auto r2 YS_ATTRIBUTE(unused) = cell->attributes.insert(std::make_pair(ID(abc9_mergeability), r.first->second)); + log_assert(r2.second); + + Wire *abc9_init_wire = module->wire(stringf("%s.$abc9_init", cell->name.c_str())); + if (abc9_init_wire == NULL) + log_error("'%s.$abc9_init' is not a wire present in module '%s'.\n", cell->name.c_str(), log_id(module)); + log_assert(GetSize(abc9_init_wire) == 1); + SigSpec abc9_init = assign_map(abc9_init_wire); + if (!abc9_init.is_fully_const()) + log_error("'%s.$abc9_init' is not a constant wire present in module '%s'.\n", cell->name.c_str(), log_id(module)); + r2 = cell->attributes.insert(std::make_pair(ID(abc9_init), abc9_init.as_const())); + log_assert(r2.second); + } + + RTLIL::Module *holes_module = design->module(stringf("%s$holes", module->name.c_str())); + if (holes_module) { + dict<SigSig, SigSig> replace; + for (auto it = holes_module->cells_.begin(); it != holes_module->cells_.end(); ) { + auto cell = it->second; + if (cell->type.in("$_DFF_N_", "$_DFF_NN0_", "$_DFF_NN1_", "$_DFF_NP0_", "$_DFF_NP1_", + "$_DFF_P_", "$_DFF_PN0_", "$_DFF_PN1", "$_DFF_PP0_", "$_DFF_PP1_")) { + SigBit D = cell->getPort("\\D"); + SigBit Q = cell->getPort("\\Q"); + // Remove the DFF cell from what needs to be a combinatorial box + it = holes_module->cells_.erase(it); + Wire *port; + if (GetSize(Q.wire) == 1) + port = holes_module->wire(stringf("$abc%s", Q.wire->name.c_str())); + else + port = holes_module->wire(stringf("$abc%s[%d]", Q.wire->name.c_str(), Q.offset)); + log_assert(port); + // Prepare to replace "assign <port> = DFF.Q;" with "assign <port> = DFF.D;" + // in order to extract the combinatorial control logic that feeds the box + // (i.e. clock enable, synchronous reset, etc.) + replace.insert(std::make_pair(SigSig(port,Q), SigSig(port,D))); + // Since `flatten` above would have created wires named "<cell>.Q", + // extract the pre-techmap cell name + auto pos = Q.wire->name.str().rfind("."); + log_assert(pos != std::string::npos); + IdString driver = Q.wire->name.substr(0, pos); + // And drive the signal that was previously driven by "DFF.Q" (typically + // used to implement clock-enable functionality) with the "<cell>.$abc9_currQ" + // wire (which itself is driven an input port) we inserted above + Wire *currQ = holes_module->wire(stringf("%s.$abc9_currQ", driver.c_str())); + log_assert(currQ); + holes_module->connect(Q, currQ); + } + else + ++it; + } + + for (auto &conn : holes_module->connections_) { + auto it = replace.find(conn); + if (it != replace.end()) + conn = it->second; + } + } +} + +void prep_holes(RTLIL::Module *module) +{ + auto design = module->design; + log_assert(design); + + SigMap sigmap(module); + + // TODO: Speed up toposort -- ultimately we care about + // box ordering, but not individual AIG cells + dict<SigBit, pool<IdString>> bit_drivers, bit_users; + TopoSort<IdString, RTLIL::sort_by_id_str> toposort; + bool abc9_box_seen = false; + + for (auto cell : module->selected_cells()) { + if (cell->type == "$_NOT_") + { + SigBit A = sigmap(cell->getPort("\\A").as_bit()); + SigBit Y = sigmap(cell->getPort("\\Y").as_bit()); + toposort.node(cell->name); + bit_users[A].insert(cell->name); + bit_drivers[Y].insert(cell->name); + continue; + } + + if (cell->type == "$_AND_") + { + SigBit A = sigmap(cell->getPort("\\A").as_bit()); + SigBit B = sigmap(cell->getPort("\\B").as_bit()); + SigBit Y = sigmap(cell->getPort("\\Y").as_bit()); + toposort.node(cell->name); + bit_users[A].insert(cell->name); + bit_users[B].insert(cell->name); + bit_drivers[Y].insert(cell->name); + continue; + } + + if (cell->type == "$__ABC9_FF_") + continue; + + RTLIL::Module* inst_module = design->module(cell->type); + if (inst_module) { + if (!inst_module->attributes.count("\\abc9_box_id") || cell->get_bool_attribute("\\abc9_keep")) + continue; + + for (const auto &conn : cell->connections()) { + auto port_wire = inst_module->wire(conn.first); + // Ignore inout for the sake of topographical ordering + if (port_wire->port_input && !port_wire->port_output) + for (auto bit : sigmap(conn.second)) + bit_users[bit].insert(cell->name); + if (port_wire->port_output) + for (auto bit : sigmap(conn.second)) + bit_drivers[bit].insert(cell->name); + } + + abc9_box_seen = true; + + toposort.node(cell->name); + } + } + + if (!abc9_box_seen) + return; + + for (auto &it : bit_users) + if (bit_drivers.count(it.first)) + for (auto driver_cell : bit_drivers.at(it.first)) + for (auto user_cell : it.second) + toposort.edge(driver_cell, user_cell); + +#if 0 + toposort.analyze_loops = true; +#endif + bool no_loops YS_ATTRIBUTE(unused) = toposort.sort(); +#if 0 + unsigned i = 0; + for (auto &it : toposort.loops) { + log(" loop %d\n", i++); + for (auto cell_name : it) { + auto cell = module->cell(cell_name); + log_assert(cell); + log("\t%s (%s @ %s)\n", log_id(cell), log_id(cell->type), cell->get_src_attribute().c_str()); + } + } +#endif + log_assert(no_loops); + + vector<Cell*> box_list; + for (auto cell_name : toposort.sorted) { + RTLIL::Cell *cell = module->cell(cell_name); + log_assert(cell); + + RTLIL::Module* box_module = design->module(cell->type); + if (!box_module || !box_module->attributes.count("\\abc9_box_id") + || cell->get_bool_attribute("\\abc9_keep")) + continue; + + bool blackbox = box_module->get_blackbox_attribute(true /* ignore_wb */); + + // Fully pad all unused input connections of this box cell with S0 + // Fully pad all undriven output connections of this box cell with anonymous wires + // NB: Assume box_module->ports are sorted alphabetically + // (as RTLIL::Module::fixup_ports() would do) + for (const auto &port_name : box_module->ports) { + RTLIL::Wire* w = box_module->wire(port_name); + log_assert(w); + auto it = cell->connections_.find(port_name); + if (w->port_input) { + RTLIL::SigSpec rhs; + if (it != cell->connections_.end()) { + if (GetSize(it->second) < GetSize(w)) + it->second.append(RTLIL::SigSpec(State::S0, GetSize(w)-GetSize(it->second))); + rhs = it->second; + } + else { + rhs = RTLIL::SigSpec(State::S0, GetSize(w)); + cell->setPort(port_name, rhs); + } + } + if (w->port_output) { + RTLIL::SigSpec rhs; + auto it = cell->connections_.find(w->name); + if (it != cell->connections_.end()) { + if (GetSize(it->second) < GetSize(w)) + it->second.append(module->addWire(NEW_ID, GetSize(w)-GetSize(it->second))); + rhs = it->second; + } + else { + Wire *wire = module->addWire(NEW_ID, GetSize(w)); + if (blackbox) + wire->set_bool_attribute(ID(abc9_padding)); + rhs = wire; + cell->setPort(port_name, rhs); + } + } + } + + box_list.emplace_back(cell); + } + log_assert(!box_list.empty()); + + RTLIL::Module *holes_module = design->addModule(stringf("%s$holes", module->name.c_str())); + log_assert(holes_module); + holes_module->set_bool_attribute("\\abc9_holes"); + + dict<IdString, Cell*> cell_cache; + + int port_id = 1; + for (auto cell : box_list) { + RTLIL::Module* orig_box_module = design->module(cell->type); + log_assert(orig_box_module); + IdString derived_name = orig_box_module->derive(design, cell->parameters); + RTLIL::Module* box_module = design->module(derived_name); + if (box_module->has_processes()) + Pass::call_on_module(design, box_module, "proc"); + + int box_inputs = 0; + auto r = cell_cache.insert(std::make_pair(derived_name, nullptr)); + Cell *holes_cell = r.first->second; + if (r.second && box_module->get_bool_attribute("\\whitebox")) { + holes_cell = holes_module->addCell(cell->name, cell->type); + holes_cell->parameters = cell->parameters; + r.first->second = holes_cell; + + // Since Module::derive() will create a new module, there + // is a chance that the ports will be alphabetically ordered + // again, which is a problem when carry-chains are involved. + // Inherit the port ordering from the original module here... + // (and set the port_id below, when iterating through those) + log_assert(GetSize(box_module->ports) == GetSize(orig_box_module->ports)); + box_module->ports = orig_box_module->ports; + } + + // NB: Assume box_module->ports are sorted alphabetically + // (as RTLIL::Module::fixup_ports() would do) + int box_port_id = 1; + for (const auto &port_name : box_module->ports) { + RTLIL::Wire *w = box_module->wire(port_name); + log_assert(w); + if (r.second) + w->port_id = box_port_id++; + RTLIL::Wire *holes_wire; + RTLIL::SigSpec port_sig; + if (w->port_input) + for (int i = 0; i < GetSize(w); i++) { + box_inputs++; + holes_wire = holes_module->wire(stringf("\\i%d", box_inputs)); + if (!holes_wire) { + holes_wire = holes_module->addWire(stringf("\\i%d", box_inputs)); + holes_wire->port_input = true; + holes_wire->port_id = port_id++; + holes_module->ports.push_back(holes_wire->name); + } + if (holes_cell) + port_sig.append(holes_wire); + } + if (w->port_output) + for (int i = 0; i < GetSize(w); i++) { + if (GetSize(w) == 1) + holes_wire = holes_module->addWire(stringf("$abc%s.%s", cell->name.c_str(), log_id(w->name))); + else + holes_wire = holes_module->addWire(stringf("$abc%s.%s[%d]", cell->name.c_str(), log_id(w->name), i)); + holes_wire->port_output = true; + holes_wire->port_id = port_id++; + holes_module->ports.push_back(holes_wire->name); + if (holes_cell) + port_sig.append(holes_wire); + else + holes_module->connect(holes_wire, State::S0); + } + if (!port_sig.empty()) { + if (r.second) + holes_cell->setPort(w->name, port_sig); + else + holes_module->connect(holes_cell->getPort(w->name), port_sig); + } + } + + // For flops only, create an extra 1-bit input that drives a new wire + // called "<cell>.$abc9_currQ" that is used below + if (box_module->get_bool_attribute("\\abc9_flop")) { + log_assert(holes_cell); + + box_inputs++; + Wire *holes_wire = holes_module->wire(stringf("\\i%d", box_inputs)); + if (!holes_wire) { + holes_wire = holes_module->addWire(stringf("\\i%d", box_inputs)); + holes_wire->port_input = true; + holes_wire->port_id = port_id++; + holes_module->ports.push_back(holes_wire->name); + } + Wire *w = holes_module->addWire(stringf("%s.$abc9_currQ", cell->name.c_str())); + holes_module->connect(w, holes_wire); + } + } +} + +struct Abc9OpsPass : public Pass { + Abc9OpsPass() : Pass("abc9_ops", "helper functions for ABC9") { } + void help() YS_OVERRIDE + { + // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| + log("\n"); + log(" abc9_ops [options] [selection]\n"); + log("\n"); + } + void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE + { + log_header(design, "Executing ABC9_OPS pass (helper functions for ABC9).\n"); + log_push(); + + bool break_scc_mode = false; + bool unbreak_scc_mode = false; + bool prep_dff_mode = false; + bool prep_holes_mode = false; + + size_t argidx; + for (argidx = 1; argidx < args.size(); argidx++) { + std::string arg = args[argidx]; + if (arg == "-break_scc") { + break_scc_mode = true; + continue; + } + if (arg == "-unbreak_scc") { + unbreak_scc_mode = true; + continue; + } + if (arg == "-prep_dff") { + prep_dff_mode = true; + continue; + } + if (arg == "-prep_holes") { + prep_holes_mode = true; + continue; + } + break; + } + extra_args(args, argidx, design); + + for (auto mod : design->selected_modules()) { + if (mod->get_blackbox_attribute()) + continue; + if (mod->get_bool_attribute("\\abc9_holes")) + continue; + + if (mod->processes.size() > 0) { + log("Skipping module %s as it contains processes.\n", log_id(mod)); + continue; + } + + if (break_scc_mode) + break_scc(mod); + if (unbreak_scc_mode) + unbreak_scc(mod); + if (prep_dff_mode) + prep_dff(mod); + if (prep_holes_mode) + prep_holes(mod); + } + } +} Abc9OpsPass; + +PRIVATE_NAMESPACE_END |