mirror of
https://github.com/YosysHQ/yosys
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88 lines
2.5 KiB
C++
88 lines
2.5 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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*
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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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#include "kernel/ffinit.h"
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#include "kernel/ff.h"
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USING_YOSYS_NAMESPACE
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PRIVATE_NAMESPACE_BEGIN
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struct ZinitPass : public Pass {
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ZinitPass() : Pass("zinit", "add inverters so all FF are zero-initialized") { }
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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(" zinit [options] [selection]\n");
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log("\n");
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log("Add inverters as needed to make all FFs zero-initialized.\n");
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log("\n");
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log(" -all\n");
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log(" also add zero initialization to uninitialized FFs\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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bool all_mode = false;
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log_header(design, "Executing ZINIT pass (make all FFs zero-initialized).\n");
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size_t argidx;
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for (argidx = 1; argidx < args.size(); argidx++)
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{
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if (args[argidx] == "-all") {
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all_mode = true;
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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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{
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SigMap sigmap(module);
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FfInitVals initvals(&sigmap, module);
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for (auto cell : module->selected_cells())
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{
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if (!cell->is_builtin_ff())
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continue;
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FfData ff(&initvals, cell);
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log("FF init value for cell %s (%s): %s = %s\n", log_id(cell), log_id(cell->type),
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log_signal(ff.sig_q), log_signal(ff.val_init));
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pool<int> bits;
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for (int i = 0; i < ff.width; i++) {
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if (ff.val_init[i] == State::S1)
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bits.insert(i);
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else if (ff.val_init[i] != State::S0 && all_mode)
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ff.val_init.set(i, State::S0);
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}
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ff.flip_bits(bits);
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ff.emit();
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}
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}
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}
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} ZinitPass;
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PRIVATE_NAMESPACE_END
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