From a27c7b45dee834dbf7342df0acff257aab946f25 Mon Sep 17 00:00:00 2001 From: David Shah Date: Sun, 30 Sep 2018 16:29:26 +0100 Subject: Refactor chain finder to its own file Signed-off-by: David Shah --- common/chain_utils.h | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 common/chain_utils.h (limited to 'common/chain_utils.h') diff --git a/common/chain_utils.h b/common/chain_utils.h new file mode 100644 index 00000000..b783e30b --- /dev/null +++ b/common/chain_utils.h @@ -0,0 +1,68 @@ +/* + * nextpnr -- Next Generation Place and Route + * + * Copyright (C) 2018 David Shah + * + * 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 cells; +}; + +// Generic chain finder +template +std::vector find_chains(const Context *ctx, F1 cell_type_predicate, F2 get_previous, F3 get_next, + size_t min_length = 2) +{ + std::set chained; + std::vector chains; + for (auto cell : sorted(ctx->cells)) { + if (chained.find(cell.first) != chained.end()) + continue; + CellInfo *ci = cell.second; + 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) { + 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 -- cgit v1.2.3