/* * yosys -- Yosys Open SYnthesis Suite * * Copyright (C) 2022 Jannis Harder <jix@yosyshq.com> <me@jix.one> * * 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/yosys.h" USING_YOSYS_NAMESPACE PRIVATE_NAMESPACE_BEGIN struct BwmuxmapPass : public Pass { BwmuxmapPass() : Pass("bwmuxmap", "replace $bwmux cells with equivalent logic") {} void help() override { // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| log("\n"); log(" bwmxumap [options] [selection]\n"); log("\n"); log("This pass replaces $bwmux cells with equivalent logic\n"); log("\n"); } void execute(std::vector<std::string> args, RTLIL::Design *design) override { log_header(design, "Executing BWMUXMAP pass.\n"); size_t argidx; for (argidx = 1; argidx < args.size(); argidx++) { // if (args[argidx] == "-arg") { // continue; // } break; } extra_args(args, argidx, design); for (auto module : design->selected_modules()) for (auto cell : module->selected_cells()) { if (cell->type != ID($bwmux)) continue; auto &sig_y = cell->getPort(ID::Y); auto &sig_a = cell->getPort(ID::A); auto &sig_b = cell->getPort(ID::B); auto &sig_s = cell->getPort(ID::S); auto not_s = module->Not(NEW_ID, sig_s); auto masked_b = module->And(NEW_ID, sig_s, sig_b); auto masked_a = module->And(NEW_ID, not_s, sig_a); module->addOr(NEW_ID, masked_a, masked_b, sig_y); module->remove(cell); } } } BwmuxmapPass; PRIVATE_NAMESPACE_END