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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2022 Marcelina Kościelnicka <mwk@0x04.net>
*
* 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 BmuxmapPass : public Pass {
BmuxmapPass() : Pass("bmuxmap", "transform $bmux cells to trees of $mux cells") { }
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" bmuxmap [selection]\n");
log("\n");
log("This pass transforms $bmux cells to trees of $mux cells.\n");
log("\n");
log(" -pmux\n");
log(" transform to $pmux instead of $mux cells.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
{
bool pmux_mode = false;
log_header(design, "Executing BMUXMAP pass.\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) {
if (args[argidx] == "-pmux") {
pmux_mode = true;
continue;
}
break;
}
extra_args(args, argidx, design);
for (auto module : design->selected_modules())
for (auto cell : module->selected_cells())
{
if (cell->type != ID($bmux))
continue;
SigSpec sel = cell->getPort(ID::S);
SigSpec data = cell->getPort(ID::A);
int width = GetSize(cell->getPort(ID::Y));
int s_width = GetSize(cell->getPort(ID::S));
if(pmux_mode)
{
int num_cases = 1 << s_width;
SigSpec new_a = SigSpec(State::Sx, width);
SigSpec new_s = module->addWire(NEW_ID, num_cases);
SigSpec new_data = module->addWire(NEW_ID, width);
for (int val = 0; val < num_cases; val++)
{
module->addEq(NEW_ID, sel, SigSpec(val, GetSize(sel)), new_s[val]);
}
RTLIL::Cell *pmux = module->addPmux(NEW_ID, new_a, data, new_s, new_data);
pmux->add_strpool_attribute(ID::src, cell->get_strpool_attribute(ID::src));
data = new_data;
}
else
{
for (int idx = 0; idx < GetSize(sel); idx++) {
SigSpec new_data = module->addWire(NEW_ID, GetSize(data)/2);
for (int i = 0; i < GetSize(new_data); i += width) {
RTLIL::Cell *mux = module->addMux(NEW_ID,
data.extract(i*2, width),
data.extract(i*2+width, width),
sel[idx],
new_data.extract(i, width));
mux->add_strpool_attribute(ID::src, cell->get_strpool_attribute(ID::src));
}
data = new_data;
}
}
module->connect(cell->getPort(ID::Y), data);
module->remove(cell);
}
}
} BmuxmapPass;
PRIVATE_NAMESPACE_END
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