/* * yosys -- Yosys Open SYnthesis Suite * * Copyright (C) 2012 Clifford Wolf * * 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/log.h" #include "kernel/celltypes.h" #include "libs/sha1/sha1.h" #include #include #include #define USE_CELL_HASH_CACHE USING_YOSYS_NAMESPACE PRIVATE_NAMESPACE_BEGIN struct OptShareWorker { RTLIL::Design *design; RTLIL::Module *module; SigMap assign_map; SigMap dff_init_map; bool mode_share_all; CellTypes ct; int total_count; #ifdef USE_CELL_HASH_CACHE dict cell_hash_cache; #endif #ifdef USE_CELL_HASH_CACHE std::string int_to_hash_string(unsigned int v) { if (v == 0) return "0"; std::string str = ""; while (v > 0) { str += 'a' + (v & 15); v = v >> 4; } return str; } std::string hash_cell_parameters_and_connections(const RTLIL::Cell *cell) { if (cell_hash_cache.count(cell) > 0) return cell_hash_cache[cell]; std::string hash_string = cell->type.str() + "\n"; for (auto &it : cell->parameters) hash_string += "P " + it.first.str() + "=" + it.second.as_string() + "\n"; const dict *conn = &cell->connections(); dict alt_conn; if (cell->type == "$and" || cell->type == "$or" || cell->type == "$xor" || cell->type == "$xnor" || cell->type == "$add" || cell->type == "$mul" || cell->type == "$logic_and" || cell->type == "$logic_or" || cell->type == "$_AND_" || cell->type == "$_OR_" || cell->type == "$_XOR_") { alt_conn = *conn; if (assign_map(alt_conn.at("\\A")) < assign_map(alt_conn.at("\\B"))) { alt_conn["\\A"] = conn->at("\\B"); alt_conn["\\B"] = conn->at("\\A"); } conn = &alt_conn; } else if (cell->type == "$reduce_xor" || cell->type == "$reduce_xnor") { alt_conn = *conn; assign_map.apply(alt_conn.at("\\A")); alt_conn.at("\\A").sort(); conn = &alt_conn; } else if (cell->type == "$reduce_and" || cell->type == "$reduce_or" || cell->type == "$reduce_bool") { alt_conn = *conn; assign_map.apply(alt_conn.at("\\A")); alt_conn.at("\\A").sort_and_unify(); conn = &alt_conn; } for (auto &it : *conn) { if (cell->output(it.first)) continue; RTLIL::SigSpec sig = it.second; assign_map.apply(sig); hash_string += "C " + it.first.str() + "="; for (auto &chunk : sig.chunks()) { if (chunk.wire) hash_string += "{" + chunk.wire->name.str() + " " + int_to_hash_string(chunk.offset) + " " + int_to_hash_string(chunk.width) + "}"; else hash_string += RTLIL::Const(chunk.data).as_string(); } hash_string += "\n"; } cell_hash_cache[cell] = sha1(hash_string); return cell_hash_cache[cell]; } #endif bool compare_cell_parameters_and_connections(const RTLIL::Cell *cell1, const RTLIL::Cell *cell2, bool <) { #ifdef USE_CELL_HASH_CACHE std::string hash1 = hash_cell_parameters_and_connections(cell1); std::string hash2 = hash_cell_parameters_and_connections(cell2); if (hash1 != hash2) { lt = hash1 < hash2; return true; } #endif if (cell1->parameters != cell2->parameters) { std::map p1(cell1->parameters.begin(), cell1->parameters.end()); std::map p2(cell2->parameters.begin(), cell2->parameters.end()); lt = p1 < p2; return true; } dict conn1 = cell1->connections(); dict conn2 = cell2->connections(); for (auto &it : conn1) { if (cell1->output(it.first)) it.second = RTLIL::SigSpec(); else assign_map.apply(it.second); } for (auto &it : conn2) { if (cell2->output(it.first)) it.second = RTLIL::SigSpec(); else assign_map.apply(it.second); } if (cell1->type == "$and" || cell1->type == "$or" || cell1->type == "$xor" || cell1->type == "$xnor" || cell1->type == "$add" || cell1->type == "$mul" || cell1->type == "$logic_and" || cell1->type == "$logic_or" || cell1->type == "$_AND_" || cell1->type == "$_OR_" || cell1->type == "$_XOR_") { if (conn1.at("\\A") < conn1.at("\\B")) { RTLIL::SigSpec tmp = conn1["\\A"]; conn1["\\A"] = conn1["\\B"]; conn1["\\B"] = tmp; } if (conn2.at("\\A") < conn2.at("\\B")) { RTLIL::SigSpec tmp = conn2["\\A"]; conn2["\\A"] = conn2["\\B"]; conn2["\\B"] = tmp; } } else if (cell1->type == "$reduce_xor" || cell1->type == "$reduce_xnor") { conn1["\\A"].sort(); conn2["\\A"].sort(); } else if (cell1->type == "$reduce_and" || cell1->type == "$reduce_or" || cell1->type == "$reduce_bool") { conn1["\\A"].sort_and_unify(); conn2["\\A"].sort_and_unify(); } if (conn1 != conn2) { std::map c1(conn1.begin(), conn1.end()); std::map c2(conn2.begin(), conn2.end()); lt = c1 < c2; return true; } if (cell1->type.substr(0, 1) == "$" && conn1.count("\\Q") != 0) { std::vector q1 = dff_init_map(cell1->getPort("\\Q")).to_sigbit_vector(); std::vector q2 = dff_init_map(cell2->getPort("\\Q")).to_sigbit_vector(); for (size_t i = 0; i < q1.size(); i++) if ((q1.at(i).wire == NULL || q2.at(i).wire == NULL) && q1.at(i) != q2.at(i)) { lt = q1.at(i) < q2.at(i); return true; } } return false; } bool compare_cells(const RTLIL::Cell *cell1, const RTLIL::Cell *cell2) { if (cell1->type != cell2->type) return cell1->type < cell2->type; if ((!mode_share_all && !ct.cell_known(cell1->type)) || !cell1->known()) return cell1 < cell2; if (cell1->has_keep_attr() || cell2->has_keep_attr()) return cell1 < cell2; bool lt; if (compare_cell_parameters_and_connections(cell1, cell2, lt)) return lt; return false; } struct CompareCells { OptShareWorker *that; CompareCells(OptShareWorker *that) : that(that) {} bool operator()(const RTLIL::Cell *cell1, const RTLIL::Cell *cell2) const { return that->compare_cells(cell1, cell2); } }; OptShareWorker(RTLIL::Design *design, RTLIL::Module *module, bool mode_nomux, bool mode_share_all) : design(design), module(module), assign_map(module), mode_share_all(mode_share_all) { total_count = 0; ct.setup_internals(); ct.setup_internals_mem(); ct.setup_stdcells(); ct.setup_stdcells_mem(); if (mode_nomux) { ct.cell_types.erase("$mux"); ct.cell_types.erase("$pmux"); } log("Finding identical cells in module `%s'.\n", module->name.c_str()); assign_map.set(module); dff_init_map.set(module); for (auto &it : module->wires_) if (it.second->attributes.count("\\init") != 0) dff_init_map.add(it.second, it.second->attributes.at("\\init")); bool did_something = true; while (did_something) { #ifdef USE_CELL_HASH_CACHE cell_hash_cache.clear(); #endif std::vector cells; cells.reserve(module->cells_.size()); for (auto &it : module->cells_) { if (!design->selected(module, it.second)) continue; if (ct.cell_known(it.second->type) || (mode_share_all && it.second->known())) cells.push_back(it.second); } did_something = false; std::map sharemap(CompareCells(this)); for (auto cell : cells) { if (sharemap.count(cell) > 0) { did_something = true; log(" Cell `%s' is identical to cell `%s'.\n", cell->name.c_str(), sharemap[cell]->name.c_str()); for (auto &it : cell->connections()) { if (cell->output(it.first)) { RTLIL::SigSpec other_sig = sharemap[cell]->getPort(it.first); log(" Redirecting output %s: %s = %s\n", it.first.c_str(), log_signal(it.second), log_signal(other_sig)); module->connect(RTLIL::SigSig(it.second, other_sig)); assign_map.add(it.second, other_sig); } } log(" Removing %s cell `%s' from module `%s'.\n", cell->type.c_str(), cell->name.c_str(), module->name.c_str()); cell_hash_cache.erase(cell); module->remove(cell); total_count++; } else { sharemap[cell] = cell; } } } } }; struct OptSharePass : public Pass { OptSharePass() : Pass("opt_share", "consolidate identical cells") { } virtual void help() { // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| log("\n"); log(" opt_share [options] [selection]\n"); log("\n"); log("This pass identifies cells with identical type and input signals. Such cells\n"); log("are then merged to one cell.\n"); log("\n"); log(" -nomux\n"); log(" Do not merge MUX cells.\n"); log("\n"); log(" -share_all\n"); log(" Operate on all cell types, not just built-in types.\n"); log("\n"); } virtual void execute(std::vector args, RTLIL::Design *design) { log_header("Executing OPT_SHARE pass (detect identical cells).\n"); bool mode_nomux = false; bool mode_share_all = false; size_t argidx; for (argidx = 1; argidx < args.size(); argidx++) { std::string arg = args[argidx]; if (arg == "-nomux") { mode_nomux = true; continue; } if (arg == "-share_all") { mode_share_all = true; continue; } break; } extra_args(args, argidx, design); int total_count = 0; for (auto module : design->selected_modules()) { OptShareWorker worker(design, module, mode_nomux, mode_share_all); total_count += worker.total_count; } if (total_count) design->scratchpad_set_bool("opt.did_something", true); log("Removed a total of %d cells.\n", total_count); } } OptSharePass; PRIVATE_NAMESPACE_END