Merge pull request #391 from YosysHQ/router2-upstream

Upstreaming router2

1 files changed, 56 insertions, 0 deletions

diff --git a/common/router2.h b/common/router2.h
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+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2019  David Shah <dave@ds0.me>
+ *
+ *  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.
+ *
+ */
+
+#include "nextpnr.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+struct Router2Cfg
+{
+    Router2Cfg(Context *ctx);
+
+    // Maximum iterations for backwards routing attempt
+    int backwards_max_iter;
+    // Maximum iterations for backwards routing attempt for global nets
+    int global_backwards_max_iter;
+    // Padding added to bounding boxes to account for imperfect routing,
+    // congestion, etc
+    int bb_margin_x, bb_margin_y;
+    // Cost factor added to input pin wires; effectively reduces the
+    // benefit of sharing interconnect
+    float ipin_cost_adder;
+    // Cost factor for "bias" towards center location of net
+    float bias_cost_factor;
+    // Starting current and historical congestion cost factor
+    float init_curr_cong_weight, hist_cong_weight;
+    // Current congestion cost multiplier
+    float curr_cong_mult;
+
+    // Weight given to delay estimate in A*. Higher values
+    // mean faster and more directed routing, at the risk
+    // of choosing a less congestion/delay-optimal route
+    float estimate_weight;
+
+    // Print additional performance profiling information
+    bool perf_profile = false;
+};
+
+void router2(Context *ctx, const Router2Cfg &cfg);
+
+NEXTPNR_NAMESPACE_END
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