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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 gatecat <gatecat@ds0.me>
*
* 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.
*
*/
#ifndef CHAIN_UTILS_H
#define CHAIN_UTILS_H
#include "nextpnr.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
struct CellChain
{
std::vector<CellInfo *> cells;
};
// Generic chain finder
template <typename F1, typename F2, typename F3>
std::vector<CellChain> find_chains(const Context *ctx, F1 cell_type_predicate, F2 get_previous, F3 get_next,
size_t min_length = 2)
{
std::set<IdString> chained;
std::vector<CellChain> chains;
for (auto &cell : ctx->cells) {
if (chained.find(cell.first) != chained.end())
continue;
CellInfo *ci = cell.second.get();
if (cell_type_predicate(ctx, ci)) {
CellInfo *start = ci;
CellInfo *prev_start = ci;
while (prev_start != nullptr) {
start = prev_start;
prev_start = get_previous(ctx, start);
}
CellChain chain;
CellInfo *end = start;
while (end != nullptr) {
if (chained.insert(end->name).second)
chain.cells.push_back(end);
end = get_next(ctx, end);
}
if (chain.cells.size() >= min_length) {
chains.push_back(chain);
for (auto c : chain.cells)
chained.insert(c->name);
}
}
}
return chains;
}
NEXTPNR_NAMESPACE_END
#endif
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