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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "kernel/yosys.h"
#include "kernel/sigtools.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct EquivAddPass : public Pass {
EquivAddPass() : Pass("equiv_add", "add a $equiv cell") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" equiv_add gold_sig gate_sig\n");
log("\n");
log("This command adds an $equiv cell for the specified signals.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, Design *design)
{
if (GetSize(args) != 3)
cmd_error(args, GetSize(args)-1, "Invalid number of arguments.");
if (design->selected_active_module.empty())
log_cmd_error("This command must be executed in module context!\n");
Module *module = design->module(design->selected_active_module);
log_assert(module != nullptr);
SigSpec gold_signal, gate_signal;
if (!SigSpec::parse(gate_signal, module, args[2]))
log_cmd_error("Error in gate signal: %s\n", args[2].c_str());
if (!SigSpec::parse_rhs(gate_signal, gold_signal, module, args[1]))
log_cmd_error("Error in gold signal: %s\n", args[1].c_str());
log_assert(GetSize(gold_signal) == GetSize(gate_signal));
SigSpec equiv_signal = module->addWire(NEW_ID, GetSize(gold_signal));
SigMap sigmap(module);
sigmap.apply(gold_signal);
sigmap.apply(gate_signal);
dict<SigBit, SigBit> to_equiv_bits;
pool<Cell*> added_equiv_cells;
for (int i = 0; i < GetSize(gold_signal); i++) {
Cell *equiv_cell = module->addEquiv(NEW_ID, gold_signal[i], gate_signal[i], equiv_signal[i]);
equiv_cell->set_bool_attribute("\\keep");
to_equiv_bits[gold_signal[i]] = equiv_signal[i];
to_equiv_bits[gate_signal[i]] = equiv_signal[i];
added_equiv_cells.insert(equiv_cell);
}
for (auto cell : module->cells())
for (auto conn : cell->connections())
if (!added_equiv_cells.count(cell) && cell->input(conn.first)) {
SigSpec new_sig;
for (auto bit : conn.second)
if (to_equiv_bits.count(sigmap(bit)))
new_sig.append(to_equiv_bits.at(sigmap(bit)));
else
new_sig.append(bit);
if (conn.second != new_sig)
cell->setPort(conn.first, new_sig);
}
}
} EquivAddPass;
PRIVATE_NAMESPACE_END
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