67 lines
2.4 KiB
C++
67 lines
2.4 KiB
C++
/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2019 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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NEXTPNR_NAMESPACE_BEGIN
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inline float default_base_cost(Context *ctx, WireId wire, PipId pip, float crit_weight)
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{
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(void)crit_weight; // unused
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return ctx->getDelayNS(ctx->getPipDelay(pip).maxDelay() + ctx->getWireDelay(wire).maxDelay() +
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ctx->getDelayEpsilon());
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}
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struct Router2Cfg
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{
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Router2Cfg(Context *ctx);
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// Maximum iterations for backwards routing attempt
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int backwards_max_iter;
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// Maximum iterations for backwards routing attempt for global nets
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int global_backwards_max_iter;
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// Padding added to bounding boxes to account for imperfect routing,
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// congestion, etc
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int bb_margin_x, bb_margin_y;
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// Cost factor added to input pin wires; effectively reduces the
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// benefit of sharing interconnect
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float ipin_cost_adder;
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// Cost factor for "bias" towards center location of net
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float bias_cost_factor;
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// Starting current and historical congestion cost factor
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float init_curr_cong_weight, hist_cong_weight;
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// Current congestion cost multiplier
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float curr_cong_mult;
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// Weight given to delay estimate in A*. Higher values
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// mean faster and more directed routing, at the risk
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// of choosing a less congestion/delay-optimal route
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float estimate_weight;
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// Print additional performance profiling information
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bool perf_profile = false;
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std::string heatmap;
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std::function<float(Context *ctx, WireId wire, PipId pip, float crit_weight)> get_base_cost = default_base_cost;
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};
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void router2(Context *ctx, const Router2Cfg &cfg);
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NEXTPNR_NAMESPACE_END
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