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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 NlutmapConfig
{
vector<int> luts;
bool assert_mode = false;
};
struct NlutmapWorker
{
const NlutmapConfig &config;
pool<Cell*> mapped_cells;
Module *module;
NlutmapWorker(const NlutmapConfig &config, Module *module) :
config(config), module(module)
{
}
RTLIL::Selection get_selection()
{
RTLIL::Selection sel(false);
for (auto cell : module->cells())
if (!mapped_cells.count(cell))
sel.select(module, cell);
return sel;
}
void run_abc(int lut_size)
{
Pass::call_on_selection(module->design, get_selection(), "lut2mux");
if (lut_size > 0)
Pass::call_on_selection(module->design, get_selection(), stringf("abc -lut 1:%d", lut_size));
else
Pass::call_on_selection(module->design, get_selection(), "abc");
Pass::call_on_module(module->design, module, "opt_clean");
}
void run()
{
vector<int> available_luts = config.luts;
while (GetSize(available_luts) > 1)
{
int n_luts = available_luts.back();
int lut_size = GetSize(available_luts);
available_luts.pop_back();
if (n_luts == 0)
continue;
run_abc(lut_size);
SigMap sigmap(module);
dict<Cell*, int> candidate_ratings;
dict<SigBit, int> bit_lut_count;
for (auto cell : module->cells())
{
if (cell->type != "$lut" || mapped_cells.count(cell))
continue;
if (GetSize(cell->getPort("\\A")) == lut_size || lut_size == 2)
candidate_ratings[cell] = 0;
for (auto &conn : cell->connections())
for (auto bit : sigmap(conn.second))
bit_lut_count[bit]++;
}
for (auto &cand : candidate_ratings)
{
for (auto &conn : cand.first->connections())
for (auto bit : sigmap(conn.second))
cand.second -= bit_lut_count[bit];
}
vector<pair<int, IdString>> rated_candidates;
for (auto &cand : candidate_ratings)
rated_candidates.push_back(pair<int, IdString>(cand.second, cand.first->name));
std::sort(rated_candidates.begin(), rated_candidates.end());
while (n_luts > 0 && !rated_candidates.empty()) {
mapped_cells.insert(module->cell(rated_candidates.back().second));
rated_candidates.pop_back();
n_luts--;
}
if (!available_luts.empty())
available_luts.back() += n_luts;
}
if (config.assert_mode) {
for (auto cell : module->cells())
if (cell->type == "$lut" && !mapped_cells.count(cell))
log_error("Insufficient number of LUTs to map all logic cells!\n");
}
run_abc(0);
}
};
struct NlutmapPass : public Pass {
NlutmapPass() : Pass("nlutmap", "map to LUTs of different sizes") { }
void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" nlutmap [options] [selection]\n");
log("\n");
log("This pass uses successive calls to 'abc' to map to an architecture. That\n");
log("provides a small number of differently sized LUTs.\n");
log("\n");
log(" -luts N_1,N_2,N_3,...\n");
log(" The number of LUTs with 1, 2, 3, ... inputs that are\n");
log(" available in the target architecture.\n");
log("\n");
log(" -assert\n");
log(" Create an error if not all logic can be mapped\n");
log("\n");
log("Excess logic that does not fit into the specified LUTs is mapped back\n");
log("to generic logic gates ($_AND_, etc.).\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
NlutmapConfig config;
log_header(design, "Executing NLUTMAP pass (mapping to constant drivers).\n");
log_push();
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-luts" && argidx+1 < args.size()) {
vector<string> tokens = split_tokens(args[++argidx], ",");
config.luts.clear();
for (auto &token : tokens)
config.luts.push_back(atoi(token.c_str()));
continue;
}
if (args[argidx] == "-assert") {
config.assert_mode = true;
continue;
}
break;
}
extra_args(args, argidx, design);
for (auto module : design->selected_whole_modules_warn())
{
NlutmapWorker worker(config, module);
worker.run();
}
log_pop();
}
} NlutmapPass;
PRIVATE_NAMESPACE_END
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