ice40: Start work on the placement legaliser
Signed-off-by: David Shah <davey1576@gmail.com>
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78
ice40/place_legaliser.cc
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78
ice40/place_legaliser.cc
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/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2018 David Shah <david@symbioticeda.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#include "place_legaliser.h"
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#include <algorithm>
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#include <vector>
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#include "cells.h"
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#include "design_utils.h"
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#include "log.h"
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#include "util.h"
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NEXTPNR_NAMESPACE_BEGIN
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// Generic chain finder
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template <typename F1, typename F2, typename F3>
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std::vector<std::vector<CellInfo *>> find_chains(const Context *ctx, F1 cell_type_predicate, F2 get_previous,
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F3 get_next, size_t min_length = 2)
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{
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std::set<IdString> chained;
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std::vector<std::vector<CellInfo *>> chains;
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for (auto cell : ctx->cells) {
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if (chained.find(cell.first) != chained.end())
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continue;
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CellInfo *ci = cell.second;
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if (cell_type_predicate(ctx, ci)) {
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CellInfo *start = ci;
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CellInfo *prev_start = ci;
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while (prev_start != nullptr) {
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start = prev_start;
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prev_start = get_previous(ctx, start);
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}
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std::vector<CellInfo *> chain;
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CellInfo *end = start;
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while (end != nullptr) {
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chain.push_back(end);
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end = get_next(ctx, end);
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}
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if (chain.size() >= min_length) {
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chains.push_back(chain);
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for (auto c : chain)
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chained.insert(c->name);
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}
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}
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}
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return chains;
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};
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bool legalise_design(Context *ctx)
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{
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std::vector<std::vector<CellInfo *>> carry_chains = find_chains(
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ctx, is_lc,
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[](const Context *ctx, const CellInfo *cell) {
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return net_driven_by(ctx, cell->ports.at(ctx->id("CIN")).net, is_lc, ctx->id("COUT"));
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},
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[](const Context *ctx, const CellInfo *cell) {
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return net_only_drives(ctx, cell->ports.at(ctx->id("COUT")).net, is_lc, ctx->id("CIN"), false);
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});
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// TODO
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return true;
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}
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NEXTPNR_NAMESPACE_END
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31
ice40/place_legaliser.h
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31
ice40/place_legaliser.h
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@ -0,0 +1,31 @@
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/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2018 David Shah <david@symbioticeda.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#ifndef PLACE_LEGALISER_H
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#define PLACE_LEGALISER_H
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#include "nextpnr.h"
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NEXTPNR_NAMESPACE_BEGIN
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bool legalise_design(Context *ctx);
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NEXTPNR_NAMESPACE_END
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#endif
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