mirror of
https://github.com/YosysHQ/yosys
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70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2022 Jannis Harder <jix@yosyshq.com> <me@jix.one>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#include "kernel/yosys.h"
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USING_YOSYS_NAMESPACE
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PRIVATE_NAMESPACE_BEGIN
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struct BwmuxmapPass : public Pass {
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BwmuxmapPass() : Pass("bwmuxmap", "replace $bwmux cells with equivalent logic") {}
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void help() override
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{
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// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
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log("\n");
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log(" bwmxumap [options] [selection]\n");
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log("\n");
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log("This pass replaces $bwmux cells with equivalent logic\n");
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log("\n");
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}
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void execute(std::vector<std::string> args, RTLIL::Design *design) override
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{
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log_header(design, "Executing BWMUXMAP pass.\n");
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size_t argidx;
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for (argidx = 1; argidx < args.size(); argidx++) {
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// if (args[argidx] == "-arg") {
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// continue;
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// }
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break;
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}
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extra_args(args, argidx, design);
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for (auto module : design->selected_modules())
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for (auto cell : module->selected_cells())
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{
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if (cell->type != ID($bwmux))
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continue;
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auto &sig_y = cell->getPort(ID::Y);
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auto &sig_a = cell->getPort(ID::A);
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auto &sig_b = cell->getPort(ID::B);
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auto &sig_s = cell->getPort(ID::S);
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auto not_s = module->Not(NEW_ID, sig_s);
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auto masked_b = module->And(NEW_ID, sig_s, sig_b);
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auto masked_a = module->And(NEW_ID, not_s, sig_a);
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module->addOr(NEW_ID, masked_a, masked_b, sig_y);
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module->remove(cell);
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}
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}
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} BwmuxmapPass;
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PRIVATE_NAMESPACE_END
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