mirror of https://github.com/YosysHQ/yosys.git
109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
/*
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* yosys -- Yosys Open SYnthesis Suite
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*
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* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
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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 "opt_status.h"
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#include "kernel/register.h"
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#include "kernel/log.h"
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#include <stdlib.h>
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#include <stdio.h>
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bool OPT_DID_SOMETHING;
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struct OptPass : public Pass {
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OptPass() : Pass("opt", "perform simple optimizations") { }
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virtual void help()
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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(" opt [-purge] [-mux_undef] [-mux_bool] [-undriven] [selection]\n");
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log("\n");
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log("This pass calls all the other opt_* passes in a useful order. This performs\n");
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log("a series of trivial optimizations and cleanups. This pass executes the other\n");
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log("passes in the following order:\n");
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log("\n");
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log(" opt_const\n");
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log(" opt_share -nomux\n");
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log("\n");
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log(" do\n");
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log(" opt_muxtree\n");
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log(" opt_reduce\n");
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log(" opt_share\n");
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log(" opt_rmdff\n");
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log(" opt_clean [-purge]\n");
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log(" opt_const [-mux_undef] [-mux_bool] [-undriven]\n");
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log(" while [changed design]\n");
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log("\n");
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}
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virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
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{
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std::string opt_clean_args;
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std::string opt_const_args;
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log_header("Executing OPT pass (performing simple optimizations).\n");
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log_push();
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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] == "-purge") {
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opt_clean_args += " -purge";
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continue;
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}
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if (args[argidx] == "-mux_undef") {
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opt_const_args += " -mux_undef";
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continue;
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}
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if (args[argidx] == "-mux_bool") {
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opt_const_args += " -mux_bool";
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continue;
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}
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if (args[argidx] == "-undriven") {
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opt_const_args += " -undriven";
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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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log_header("Optimizing in-memory representation of design.\n");
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design->optimize();
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Pass::call(design, "opt_const");
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Pass::call(design, "opt_share -nomux");
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while (1) {
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OPT_DID_SOMETHING = false;
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Pass::call(design, "opt_muxtree");
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Pass::call(design, "opt_reduce");
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Pass::call(design, "opt_share");
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Pass::call(design, "opt_rmdff");
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Pass::call(design, "opt_clean" + opt_clean_args);
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Pass::call(design, "opt_const" + opt_const_args);
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if (OPT_DID_SOMETHING == false)
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break;
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log_header("Rerunning OPT passes. (Maybe there is more to do..)\n");
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}
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log_header("Optimizing in-memory representation of design.\n");
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design->optimize();
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log_header("Finished OPT passes. (There is nothing left to do.)\n");
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log_pop();
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}
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} OptPass;
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