mirror of https://github.com/YosysHQ/yosys.git
110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
/*
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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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* Akash Levy <akash@silimate.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/sigtools.h"
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USING_YOSYS_NAMESPACE
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PRIVATE_NAMESPACE_BEGIN
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bool did_something;
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#include "passes/silimate/peepopt_shift.h"
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struct OptShiftPass : public Pass {
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OptShiftPass() : Pass("opt_shift", "shift optimizations: combine and expand") { }
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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(" opt_shift [options] [selection]\n");
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log("\n");
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log("This pass performs shift optimizations.\n");
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log("\n");
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log(" -combine\n");
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log(" Combine nested shift operations (works with all\n");
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log(" combinations of $shl/$sshl and $shr/$sshr):\n");
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log(" (a <</<< b) <</<< c ===> a <</<< (b + c)\n");
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log(" (a >>>/>> b) >>>/>> c ===> a >>>/>> (b + c)\n");
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log(" (a <</<< b) >>>/>> c ===> a <</<< (b - c)\n");
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log(" (a >>>/>> b) <</<< c ===> a >>>/>> (b - c)\n");
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log(" Result uses the inner shift's type.\n");
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log("\n");
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log(" -expand\n");
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log(" Expand shifts across binary operations:\n");
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log(" (a OP b) << c ===> (a << c) OP (b << c)\n");
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log(" (a OP b) >> c ===> (a >> c) OP (b >> c)\n");
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log(" where OP in {$and, $or, $xor, $add, $sub}\n");
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log("\n");
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log(" -max_iters n\n");
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log(" max number of pass iterations to run.\n");
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log("\n");
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log("If neither -combine nor -expand is given, both are run.\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 OPT_SHIFT pass (shift optimizations).\n");
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bool run_combine = false;
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bool run_expand = false;
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int max_iters = 10000;
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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] == "-combine") {
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run_combine = true;
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continue;
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}
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if (args[argidx] == "-expand") {
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run_expand = true;
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continue;
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}
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if (args[argidx] == "-max_iters" && argidx + 1 < args.size()) {
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max_iters = std::stoi(args[++argidx]);
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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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if (!run_combine && !run_expand) {
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run_combine = true;
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run_expand = true;
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}
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for (auto module : design->selected_modules())
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{
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did_something = true;
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for (int i = 0; did_something && i < max_iters; i++)
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{
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did_something = false;
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peepopt_pm pm(module);
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pm.setup(module->selected_cells());
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if (run_combine)
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pm.run_combine_shifts();
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if (run_expand)
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pm.run_expand_shifts();
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}
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}
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}
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} OptShiftPass;
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PRIVATE_NAMESPACE_END
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