98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2018 Claire Xenia Wolf <claire@yosyshq.com>
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* Copyright (C) 2018 gatecat <gatecat@ds0.me>
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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 "nextpnr.h"
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#ifndef DESIGN_UTILS_H
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#define DESIGN_UTILS_H
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#include <algorithm>
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NEXTPNR_NAMESPACE_BEGIN
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/*
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Utilities for design manipulation, intended for use inside packing algorithms
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*/
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// If a net drives a given port of a cell matching a predicate (in many
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// cases more than one cell type, e.g. SB_DFFxx so a predicate is used), return
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// the first instance of that cell (otherwise nullptr). If exclusive is set to
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// true, then this cell must be the only load. If ignore_cell is set, that cell
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// is not considered
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template <typename F1>
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CellInfo *net_only_drives(const Context *ctx, NetInfo *net, F1 cell_pred, IdString port, bool exclusive = false,
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CellInfo *exclude = nullptr)
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{
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if (net == nullptr)
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return nullptr;
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if (exclusive) {
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if (exclude == nullptr) {
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if (net->users.entries() != 1)
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return nullptr;
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} else {
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if (net->users.entries() > 2) {
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return nullptr;
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} else if (net->users.entries() == 2) {
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bool found = false;
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for (auto &usr : net->users) {
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if (usr.cell == exclude)
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found = true;
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}
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if (!found)
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return nullptr;
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}
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}
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}
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for (const auto &load : net->users) {
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if (load.cell != exclude && cell_pred(ctx, load.cell) && load.port == port) {
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return load.cell;
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}
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}
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return nullptr;
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}
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// If a net is driven by a given port of a cell matching a predicate, return
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// that cell, otherwise nullptr
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template <typename F1> CellInfo *net_driven_by(const Context *ctx, const NetInfo *net, F1 cell_pred, IdString port)
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{
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if (net == nullptr)
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return nullptr;
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if (net->driver.cell == nullptr)
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return nullptr;
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if (cell_pred(ctx, net->driver.cell) && net->driver.port == port) {
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return net->driver.cell;
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} else {
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return nullptr;
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}
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}
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// Check if a port is used
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inline bool port_used(CellInfo *cell, IdString port_name)
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{
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auto port_fnd = cell->ports.find(port_name);
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return port_fnd != cell->ports.end() && port_fnd->second.net != nullptr;
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}
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void print_utilisation(const Context *ctx);
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NEXTPNR_NAMESPACE_END
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#endif
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