mirror of https://github.com/YosysHQ/yosys.git
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
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/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.com>
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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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#include "kernel/cost.h"
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USING_YOSYS_NAMESPACE
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PRIVATE_NAMESPACE_BEGIN
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struct KeepHierarchyPass : public Pass {
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KeepHierarchyPass() : Pass("keep_hierarchy", "add the keep_hierarchy attribute") {}
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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(" keep_hierarchy [options]\n");
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log("\n");
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log("Add the keep_hierarchy attribute.\n");
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log("\n");
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log(" -min_cost <min_cost>\n");
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log(" only add the attribute to modules estimated to have more\n");
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log(" than <min_cost> gates after simple techmapping. Intended\n");
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log(" for tuning trade-offs between quality and yosys runtime.\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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unsigned int min_cost = 0;
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log_header(design, "Executing KEEP_HIERARCHY 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] == "-min_cost" && argidx+1 < args.size()) {
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min_cost = std::stoi(args[++argidx].c_str());
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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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CellCosts costs(design);
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for (auto module : design->selected_modules()) {
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if (min_cost) {
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unsigned int cost = costs.get(module);
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if (cost > min_cost) {
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log("Marking %s (module too big: %d > %d).\n", log_id(module), cost, min_cost);
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module->set_bool_attribute(ID::keep_hierarchy);
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}
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} else {
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log("Marking %s.\n", log_id(module));
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module->set_bool_attribute(ID::keep_hierarchy);
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}
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}
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}
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} KeepHierarchyPass;
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PRIVATE_NAMESPACE_END
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