74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2018 Clifford Wolf <clifford@clifford.at>
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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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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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// Disconnect a net (if connected) from old, and connect it to rep
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void replace_port(CellInfo *old_cell, IdString old_name, CellInfo *rep_cell,
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IdString rep_name);
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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
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template <typename F1>
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CellInfo *net_only_drives(NetInfo *net, F1 cell_pred, IdString port,
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bool exclusive = false)
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{
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if (net == nullptr)
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return nullptr;
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if (exclusive && (net->users.size() != 1)) {
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return nullptr;
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} else {
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for (const auto &load : net->users) {
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if (cell_pred(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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}
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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>
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CellInfo *net_driven_by(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 (cell_pred(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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NEXTPNR_NAMESPACE_END
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#endif
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