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author | Clifford Wolf <clifford@clifford.at> | 2019-06-20 13:44:21 +0200 |
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committer | Clifford Wolf <clifford@clifford.at> | 2019-06-20 13:44:21 +0200 |
commit | 2454ad99bf49afe752d6fd1c1567f59ee9e26736 (patch) | |
tree | f0994e4d7bcc9621b63d1e4cd07f2fe8134611a5 /passes/opt | |
parent | 73bd1d59a7579ea74fb4a201771c983eeaf9a76a (diff) | |
download | yosys-2454ad99bf49afe752d6fd1c1567f59ee9e26736.tar.gz yosys-2454ad99bf49afe752d6fd1c1567f59ee9e26736.tar.bz2 yosys-2454ad99bf49afe752d6fd1c1567f59ee9e26736.zip |
Refactor "opt_rmdff -sat"
Signed-off-by: Clifford Wolf <clifford@clifford.at>
Diffstat (limited to 'passes/opt')
-rw-r--r-- | passes/opt/netlist.h | 317 | ||||
-rw-r--r-- | passes/opt/opt_rmdff.cc | 88 |
2 files changed, 46 insertions, 359 deletions
diff --git a/passes/opt/netlist.h b/passes/opt/netlist.h deleted file mode 100644 index f029ad6ab..000000000 --- a/passes/opt/netlist.h +++ /dev/null @@ -1,317 +0,0 @@ -/* -*- c++ -*- - * yosys -- Yosys Open SYnthesis Suite - * - * Copyright (C) 2012 Clifford Wolf <clifford@clifford.at> - * - * 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. - * - */ - -#ifndef SATGEN_ALGO_H -#define SATGEN_ALGO_H - -#include "kernel/celltypes.h" -#include "kernel/rtlil.h" -#include "kernel/sigtools.h" -#include <stack> - -YOSYS_NAMESPACE_BEGIN - -CellTypes comb_cells_filt() -{ - CellTypes ct; - - ct.setup_internals(); - ct.setup_stdcells(); - - return ct; -} - -struct Netlist { - RTLIL::Module *module; - SigMap sigmap; - CellTypes ct; - dict<RTLIL::SigBit, Cell *> sigbit_driver_map; - dict<RTLIL::Cell *, std::set<RTLIL::SigBit>> cell_inputs_map; - - Netlist(RTLIL::Module *module) : module(module), sigmap(module), ct(module->design) { setup_netlist(module, ct); } - - Netlist(RTLIL::Module *module, const CellTypes &ct) : module(module), sigmap(module), ct(ct) { setup_netlist(module, ct); } - - RTLIL::Cell *driver_cell(RTLIL::SigBit sig) const - { - sig = sigmap(sig); - if (!sigbit_driver_map.count(sig)) { - return NULL; - } - - return sigbit_driver_map.at(sig); - } - - RTLIL::SigSpec driver_port(RTLIL::SigBit sig) - { - RTLIL::Cell *cell = driver_cell(sig); - - if (!cell) { - return RTLIL::SigSpec(); - } - - for (auto &port : cell->connections_) { - if (ct.cell_output(cell->type, port.first)) { - RTLIL::SigSpec port_sig = sigmap(port.second); - for (int i = 0; i < GetSize(port_sig); i++) { - if (port_sig[i] == sig) { - return port.second[i]; - } - } - } - } - - return RTLIL::SigSpec(); - } - - void setup_netlist(RTLIL::Module *module, const CellTypes &ct) - { - for (auto cell : module->cells()) { - if (ct.cell_known(cell->type)) { - std::set<RTLIL::SigBit> inputs, outputs; - for (auto &port : cell->connections()) { - std::vector<RTLIL::SigBit> bits = sigmap(port.second).to_sigbit_vector(); - if (ct.cell_output(cell->type, port.first)) - outputs.insert(bits.begin(), bits.end()); - else - inputs.insert(bits.begin(), bits.end()); - } - cell_inputs_map[cell] = inputs; - for (auto &bit : outputs) { - sigbit_driver_map[bit] = cell; - }; - } - } - } -}; - -namespace detail -{ -struct NetlistConeWireIter : public std::iterator<std::input_iterator_tag, RTLIL::SigBit> { - using set_iter_t = std::set<RTLIL::SigBit>::iterator; - - const Netlist &net; - RTLIL::SigBit sig; - bool sentinel; - CellTypes *cell_filter; - - std::stack<std::pair<set_iter_t, set_iter_t>> dfs_path_stack; - std::set<RTLIL::Cell *> cells_visited; - - NetlistConeWireIter(const Netlist &net) : net(net), sentinel(true), cell_filter(NULL) {} - - NetlistConeWireIter(const Netlist &net, RTLIL::SigBit sig, CellTypes *cell_filter = NULL) - : net(net), sig(sig), sentinel(false), cell_filter(cell_filter) - { - } - - const RTLIL::SigBit &operator*() const { return sig; }; - bool operator!=(const NetlistConeWireIter &other) const - { - if (sentinel || other.sentinel) { - return sentinel != other.sentinel; - } else { - return sig != other.sig; - } - } - - bool operator==(const NetlistConeWireIter &other) const - { - if (sentinel || other.sentinel) { - return sentinel == other.sentinel; - } else { - return sig == other.sig; - } - } - - void next_sig_in_dag() - { - while (1) { - if (dfs_path_stack.empty()) { - sentinel = true; - return; - } - - auto &cell_inputs_iter = dfs_path_stack.top().first; - auto &cell_inputs_iter_guard = dfs_path_stack.top().second; - - cell_inputs_iter++; - if (cell_inputs_iter != cell_inputs_iter_guard) { - sig = *cell_inputs_iter; - return; - } else { - dfs_path_stack.pop(); - } - } - } - - NetlistConeWireIter &operator++() - { - RTLIL::Cell *cell = net.driver_cell(sig); - - if (!cell) { - next_sig_in_dag(); - return *this; - } - - if (cells_visited.count(cell)) { - next_sig_in_dag(); - return *this; - } - - if ((cell_filter) && (!cell_filter->cell_known(cell->type))) { - next_sig_in_dag(); - return *this; - } - - auto &inputs = net.cell_inputs_map.at(cell); - dfs_path_stack.push(std::make_pair(inputs.begin(), inputs.end())); - cells_visited.insert(cell); - sig = (*dfs_path_stack.top().first); - return *this; - } -}; - -struct NetlistConeWireIterable { - const Netlist &net; - RTLIL::SigBit sig; - CellTypes *cell_filter; - - NetlistConeWireIterable(const Netlist &net, RTLIL::SigBit sig, CellTypes *cell_filter = NULL) : net(net), sig(sig), cell_filter(cell_filter) - { - } - - NetlistConeWireIter begin() { return NetlistConeWireIter(net, sig, cell_filter); } - NetlistConeWireIter end() { return NetlistConeWireIter(net); } -}; - -struct NetlistConeCellIter : public std::iterator<std::input_iterator_tag, RTLIL::Cell *> { - const Netlist &net; - - NetlistConeWireIter sig_iter; - - NetlistConeCellIter(const Netlist &net) : net(net), sig_iter(net) {} - - NetlistConeCellIter(const Netlist &net, RTLIL::SigBit sig, CellTypes *cell_filter = NULL) : net(net), sig_iter(net, sig, cell_filter) - { - if ((!sig_iter.sentinel) && (!has_driver_cell(*sig_iter))) { - ++(*this); - } - } - - bool has_driver_cell(const RTLIL::SigBit &s) { return net.sigbit_driver_map.count(s); } - - RTLIL::Cell *operator*() const { return net.sigbit_driver_map.at(*sig_iter); }; - - bool operator!=(const NetlistConeCellIter &other) const { return sig_iter != other.sig_iter; } - bool operator==(const NetlistConeCellIter &other) const { return sig_iter == other.sig_iter; } - NetlistConeCellIter &operator++() - { - while (true) { - ++sig_iter; - if (sig_iter.sentinel) { - return *this; - } - - RTLIL::Cell* cell = net.driver_cell(*sig_iter); - - if (!cell) { - continue; - } - - if ((sig_iter.cell_filter) && (!sig_iter.cell_filter->cell_known(cell->type))) { - continue; - } - - if (!sig_iter.cells_visited.count(cell)) { - return *this; - } - } - } -}; - -struct NetlistConeCellIterable { - const Netlist &net; - RTLIL::SigBit sig; - CellTypes *cell_filter; - - NetlistConeCellIterable(const Netlist &net, RTLIL::SigBit sig, CellTypes *cell_filter = NULL) : net(net), sig(sig), cell_filter(cell_filter) - { - } - - NetlistConeCellIter begin() { return NetlistConeCellIter(net, sig, cell_filter); } - NetlistConeCellIter end() { return NetlistConeCellIter(net); } -}; - -// struct NetlistConeInputsIter : public std::iterator<std::input_iterator_tag, const RTLIL::Cell *> { -// const Netlist &net; -// RTLIL::SigBit sig; - -// NetlistConeWireIter sig_iter; - -// bool has_driver_cell(const RTLIL::SigBit &s) { return net.sigbit_driver_map.count(s); } - -// NetlistConeInputsIter(const Netlist &net, RTLIL::SigBit sig = NULL) : net(net), sig(sig), sig_iter(net, sig) -// { -// if ((sig != NULL) && (has_driver_cell(sig_iter))) { -// ++(*this); -// } -// } - -// const RTLIL::SigBit &operator*() const { return sig_iter; }; -// bool operator!=(const NetlistConeInputsIter &other) const { return sig_iter != other.sig_iter; } -// bool operator==(const NetlistConeInputsIter &other) const { return sig_iter == other.sig_iter; } -// NetlistConeInputsIter &operator++() -// { -// do { -// ++sig_iter; -// if (sig_iter->empty()) { -// return *this; -// } -// } while (has_driver_cell(sig_iter)); - -// return *this; -// } -// }; - -// struct NetlistConeInputsIterable { -// const Netlist &net; -// RTLIL::SigBit sig; - -// NetlistConeInputsIterable(const Netlist &net, RTLIL::SigBit sig) : net(net), sig(sig) {} - -// NetlistConeInputsIter begin() { return NetlistConeInputsIter(net, sig); } -// NetlistConeInputsIter end() { return NetlistConeInputsIter(net); } -// }; -} // namespace detail - -detail::NetlistConeWireIterable cone(const Netlist &net, RTLIL::SigBit sig, CellTypes *cell_filter = NULL) -{ - return detail::NetlistConeWireIterable(net, net.sigmap(sig), cell_filter = cell_filter); -} - -// detail::NetlistConeInputsIterable cone_inputs(RTLIL::SigBit sig) { return NetlistConeInputsIterable(this, &sig); } -detail::NetlistConeCellIterable cell_cone(const Netlist &net, RTLIL::SigBit sig, CellTypes *cell_filter = NULL) -{ - return detail::NetlistConeCellIterable(net, net.sigmap(sig), cell_filter); -} - -YOSYS_NAMESPACE_END - -#endif diff --git a/passes/opt/opt_rmdff.cc b/passes/opt/opt_rmdff.cc index 0ab91ca9e..5fc28ae92 100644 --- a/passes/opt/opt_rmdff.cc +++ b/passes/opt/opt_rmdff.cc @@ -22,7 +22,6 @@ #include "kernel/rtlil.h" #include "kernel/satgen.h" #include "kernel/sigtools.h" -#include "netlist.h" #include <stdio.h> #include <stdlib.h> @@ -31,9 +30,8 @@ PRIVATE_NAMESPACE_BEGIN SigMap assign_map, dff_init_map; SigSet<RTLIL::Cell*> mux_drivers; +dict<SigBit, RTLIL::Cell*> bit2driver; dict<SigBit, pool<SigBit>> init_attributes; -std::map<RTLIL::Module*, Netlist> netlists; -std::map<RTLIL::Module *, CellTypes> comb_filters; bool keepdc; bool sat; @@ -459,41 +457,46 @@ bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff) dff->unsetPort("\\E"); } - if (sat && has_init) { + if (sat && has_init && (!sig_r.size() || val_init == val_rv)) + { bool removed_sigbits = false; - // Create netlist for the module if not already available - if (!netlists.count(mod)) { - netlists.emplace(mod, Netlist(mod)); - comb_filters.emplace(mod, comb_cells_filt()); - } - - // Load netlist for the module from the pool - Netlist &net = netlists.at(mod); - + ezSatPtr ez; + SatGen satgen(ez.get(), &assign_map); + pool<Cell*> sat_cells; + + std::function<void(Cell*)> sat_import_cell = [&](Cell *c) { + if (!sat_cells.insert(c).second) + return; + if (!satgen.importCell(c)) + return; + for (auto &conn : c->connections()) { + if (!c->input(conn.first)) + continue; + for (auto bit : assign_map(conn.second)) + if (bit2driver.count(bit)) + sat_import_cell(bit2driver.at(bit)); + } + }; // For each register bit, try to prove that it cannot change from the initial value. If so, remove it for (int position = 0; position < GetSize(sig_d); position += 1) { RTLIL::SigBit q_sigbit = sig_q[position]; RTLIL::SigBit d_sigbit = sig_d[position]; - if ((!q_sigbit.wire) || (!d_sigbit.wire)) { + if ((!q_sigbit.wire) || (!d_sigbit.wire)) continue; - } - ezSatPtr ez; - SatGen satgen(ez.get(), &net.sigmap); + if (!bit2driver.count(d_sigbit)) + continue; - // Create SAT instance only for the cells that influence the register bit combinatorially - for (const auto &cell : cell_cone(net, d_sigbit, &comb_filters.at(mod))) { - if (!satgen.importCell(cell)) - log_error("Can't create SAT model for cell %s (%s)!\n", RTLIL::id2cstr(cell->name), - RTLIL::id2cstr(cell->type)); - } + sat_import_cell(bit2driver.at(d_sigbit)); - RTLIL::Const sigbit_init_val = val_init.extract(position); - int init_sat_pi = satgen.importSigSpec(sigbit_init_val).front(); + RTLIL::State sigbit_init_val = val_init[position]; + if (sigbit_init_val != State::S0 && sigbit_init_val != State::S1) + continue; + int init_sat_pi = satgen.importSigSpec(sigbit_init_val).front(); int q_sat_pi = satgen.importSigBit(q_sigbit); int d_sat_pi = satgen.importSigBit(d_sigbit); @@ -501,24 +504,21 @@ bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff) bool counter_example_found = ez->solve(ez->IFF(q_sat_pi, init_sat_pi), ez->NOT(ez->IFF(d_sat_pi, init_sat_pi))); // If the register bit cannot change, we can replace it with a constant - if (!counter_example_found) { - - RTLIL::SigSpec driver_port = net.driver_port(q_sigbit); - RTLIL::Wire *dummy_wire = mod->addWire(NEW_ID, 1); - - for (auto &conn : mod->connections_) - net.sigmap(conn.first).replace(driver_port, dummy_wire, &conn.first); - - remove_init_attr(driver_port); - driver_port = dummy_wire; + if (!counter_example_found) + { + log("Setting constant %d-bit at position %d on %s (%s) from module %s.\n", sigbit_init_val ? 1 : 0, + position, log_id(dff), log_id(dff->type), log_id(mod)); - mod->connect(RTLIL::SigSig(q_sigbit, sigbit_init_val)); + SigSpec tmp = dff->getPort("\\D"); + tmp[position] = sigbit_init_val; + dff->setPort("\\D", tmp); removed_sigbits = true; } } if (removed_sigbits) { + handle_dff(mod, dff); return true; } } @@ -566,8 +566,6 @@ struct OptRmdffPass : public Pass { break; } extra_args(args, argidx, design); - netlists.clear(); - comb_filters.clear(); for (auto module : design->selected_modules()) { pool<SigBit> driven_bits; @@ -576,6 +574,7 @@ struct OptRmdffPass : public Pass { assign_map.set(module); dff_init_map.set(module); mux_drivers.clear(); + bit2driver.clear(); init_attributes.clear(); for (auto wire : module->wires()) @@ -600,17 +599,21 @@ struct OptRmdffPass : public Pass { driven_bits.insert(bit); } } - mux_drivers.clear(); std::vector<RTLIL::IdString> dff_list; std::vector<RTLIL::IdString> dffsr_list; std::vector<RTLIL::IdString> dlatch_list; for (auto cell : module->cells()) { - for (auto &conn : cell->connections()) - if (cell->output(conn.first) || !cell->known()) - for (auto bit : assign_map(conn.second)) + for (auto &conn : cell->connections()) { + bool is_output = cell->output(conn.first); + if (is_output || !cell->known()) + for (auto bit : assign_map(conn.second)) { + if (is_output) + bit2driver[bit] = cell; driven_bits.insert(bit); + } + } if (cell->type == "$mux" || cell->type == "$pmux") { if (cell->getPort("\\A").size() == cell->getPort("\\B").size()) @@ -682,6 +685,7 @@ struct OptRmdffPass : public Pass { assign_map.clear(); mux_drivers.clear(); + bit2driver.clear(); init_attributes.clear(); if (total_count || total_initdrv) |