1268 lines
50 KiB
C++
1268 lines
50 KiB
C++
/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2019 David Shah <dave@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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* Core routing algorithm based on CRoute:
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*
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* CRoute: A Fast High-quality Timing-driven Connection-based FPGA Router
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* Dries Vercruyce, Elias Vansteenkiste and Dirk Stroobandt
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* DOI 10.1109/FCCM.2019.00017 [PDF on SciHub]
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*
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* Modified for the nextpnr Arch API and data structures; optimised for
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* real-world FPGA architectures in particular ECP5 and Xilinx UltraScale+
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*
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*/
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#include "router2.h"
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#include <algorithm>
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#include <boost/container/flat_map.hpp>
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#include <chrono>
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#include <deque>
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#include <fstream>
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#include <queue>
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#include "log.h"
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#include "nextpnr.h"
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#include "router1.h"
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#include "timing.h"
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#include "util.h"
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NEXTPNR_NAMESPACE_BEGIN
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namespace {
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struct Router2
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{
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struct PerArcData
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{
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WireId sink_wire;
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ArcBounds bb;
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bool routed = false;
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float arc_crit = 0;
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};
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// As we allow overlap at first; the nextpnr bind functions can't be used
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// as the primary relation between arcs and wires/pips
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struct PerNetData
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{
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WireId src_wire;
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std::vector<std::vector<PerArcData>> arcs;
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ArcBounds bb;
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// Coordinates of the center of the net, used for the weight-to-average
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int cx, cy, hpwl;
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int total_route_us = 0;
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float max_crit = 0;
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};
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struct WireScore
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{
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float cost;
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float togo_cost;
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delay_t delay;
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float total() const { return cost + togo_cost; }
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};
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struct PerWireData
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{
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// nextpnr
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WireId w;
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// net --> number of arcs; driving pip
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boost::container::flat_map<int, std::pair<int, PipId>> bound_nets;
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// Historical congestion cost
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float hist_cong_cost = 1.0;
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// Wire is unavailable as locked to another arc
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bool unavailable = false;
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// This wire has to be used for this net
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int reserved_net = -1;
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// The notional location of the wire, to guarantee thread safety
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int16_t x = 0, y = 0;
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// Visit data
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struct
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{
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bool dirty = false, visited = false;
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PipId pip;
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WireScore score;
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} visit;
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};
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float present_wire_cost(const PerWireData &w, int net_uid)
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{
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int other_sources = int(w.bound_nets.size());
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if (w.bound_nets.count(net_uid))
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other_sources -= 1;
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if (other_sources == 0)
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return 1.0f;
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else
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return 1 + other_sources * curr_cong_weight;
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}
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Context *ctx;
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Router2Cfg cfg;
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Router2(Context *ctx, const Router2Cfg &cfg) : ctx(ctx), cfg(cfg) {}
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// Use 'udata' for fast net lookups and indexing
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std::vector<NetInfo *> nets_by_udata;
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std::vector<PerNetData> nets;
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bool timing_driven;
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// Criticality data from timing analysis
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NetCriticalityMap net_crit;
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void setup_nets()
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{
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// Populate per-net and per-arc structures at start of routing
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nets.resize(ctx->nets.size());
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nets_by_udata.resize(ctx->nets.size());
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size_t i = 0;
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for (auto net : sorted(ctx->nets)) {
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NetInfo *ni = net.second;
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ni->udata = i;
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nets_by_udata.at(i) = ni;
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nets.at(i).arcs.resize(ni->users.size());
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// Start net bounding box at overall min/max
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nets.at(i).bb.x0 = std::numeric_limits<int>::max();
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nets.at(i).bb.x1 = std::numeric_limits<int>::min();
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nets.at(i).bb.y0 = std::numeric_limits<int>::max();
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nets.at(i).bb.y1 = std::numeric_limits<int>::min();
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nets.at(i).cx = 0;
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nets.at(i).cy = 0;
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if (ni->driver.cell != nullptr) {
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Loc drv_loc = ctx->getBelLocation(ni->driver.cell->bel);
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nets.at(i).cx += drv_loc.x;
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nets.at(i).cy += drv_loc.y;
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}
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for (size_t j = 0; j < ni->users.size(); j++) {
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auto &usr = ni->users.at(j);
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WireId src_wire = ctx->getNetinfoSourceWire(ni);
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for (auto &dst_wire : ctx->getNetinfoSinkWires(ni, usr)) {
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nets.at(i).src_wire = src_wire;
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if (ni->driver.cell == nullptr)
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src_wire = dst_wire;
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if (ni->driver.cell == nullptr && dst_wire == WireId())
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continue;
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if (src_wire == WireId())
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log_error("No wire found for port %s on source cell %s.\n", ctx->nameOf(ni->driver.port),
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ctx->nameOf(ni->driver.cell));
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if (dst_wire == WireId())
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log_error("No wire found for port %s on destination cell %s.\n", ctx->nameOf(usr.port),
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ctx->nameOf(usr.cell));
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nets.at(i).arcs.at(j).emplace_back();
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auto &ad = nets.at(i).arcs.at(j).back();
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ad.sink_wire = dst_wire;
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// Set bounding box for this arc
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ad.bb = ctx->getRouteBoundingBox(src_wire, dst_wire);
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// Expand net bounding box to include this arc
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nets.at(i).bb.x0 = std::min(nets.at(i).bb.x0, ad.bb.x0);
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nets.at(i).bb.x1 = std::max(nets.at(i).bb.x1, ad.bb.x1);
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nets.at(i).bb.y0 = std::min(nets.at(i).bb.y0, ad.bb.y0);
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nets.at(i).bb.y1 = std::max(nets.at(i).bb.x1, ad.bb.y1);
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}
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// Add location to centroid sum
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Loc usr_loc = ctx->getBelLocation(usr.cell->bel);
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nets.at(i).cx += usr_loc.x;
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nets.at(i).cy += usr_loc.y;
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}
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nets.at(i).hpwl = std::max(
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std::abs(nets.at(i).bb.y1 - nets.at(i).bb.y0) + std::abs(nets.at(i).bb.x1 - nets.at(i).bb.x0), 1);
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nets.at(i).cx /= int(ni->users.size() + 1);
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nets.at(i).cy /= int(ni->users.size() + 1);
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if (ctx->debug)
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log_info("%s: bb=(%d, %d)->(%d, %d) c=(%d, %d) hpwl=%d\n", ctx->nameOf(ni), nets.at(i).bb.x0,
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nets.at(i).bb.y0, nets.at(i).bb.x1, nets.at(i).bb.y1, nets.at(i).cx, nets.at(i).cy,
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nets.at(i).hpwl);
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i++;
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}
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}
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std::unordered_map<WireId, int> wire_to_idx;
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std::vector<PerWireData> flat_wires;
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PerWireData &wire_data(WireId w) { return flat_wires[wire_to_idx.at(w)]; }
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void setup_wires()
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{
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// Set up per-wire structures, so that MT parts don't have to do any memory allocation
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// This is possibly quite wasteful and not cache-optimal; further consideration necessary
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for (auto wire : ctx->getWires()) {
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PerWireData pwd;
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pwd.w = wire;
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NetInfo *bound = ctx->getBoundWireNet(wire);
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if (bound != nullptr) {
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pwd.bound_nets[bound->udata] = std::make_pair(0, bound->wires.at(wire).pip);
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if (bound->wires.at(wire).strength > STRENGTH_STRONG)
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pwd.unavailable = true;
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}
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ArcBounds wire_loc = ctx->getRouteBoundingBox(wire, wire);
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pwd.x = (wire_loc.x0 + wire_loc.x1) / 2;
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pwd.y = (wire_loc.y0 + wire_loc.y1) / 2;
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wire_to_idx[wire] = int(flat_wires.size());
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flat_wires.push_back(pwd);
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}
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for (auto net_pair : sorted(ctx->nets)) {
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auto *net = net_pair.second;
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auto &nd = nets.at(net->udata);
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for (size_t usr = 0; usr < net->users.size(); usr++) {
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auto &ad = nd.arcs.at(usr);
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for (size_t phys_pin = 0; phys_pin < ad.size(); phys_pin++) {
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if (check_arc_routing(net, usr, phys_pin)) {
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record_prerouted_net(net, usr, phys_pin);
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}
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}
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}
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}
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}
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struct QueuedWire
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{
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explicit QueuedWire(int wire = -1, PipId pip = PipId(), Loc loc = Loc(), WireScore score = WireScore{},
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int randtag = 0)
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: wire(wire), pip(pip), loc(loc), score(score), randtag(randtag){};
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int wire;
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PipId pip;
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Loc loc;
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WireScore score;
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int randtag = 0;
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struct Greater
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{
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bool operator()(const QueuedWire &lhs, const QueuedWire &rhs) const noexcept
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{
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float lhs_score = lhs.score.cost + lhs.score.togo_cost,
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rhs_score = rhs.score.cost + rhs.score.togo_cost;
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return lhs_score == rhs_score ? lhs.randtag > rhs.randtag : lhs_score > rhs_score;
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}
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};
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};
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bool hit_test_pip(ArcBounds &bb, Loc l)
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{
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return l.x >= (bb.x0 - cfg.bb_margin_x) && l.x <= (bb.x1 + cfg.bb_margin_x) &&
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l.y >= (bb.y0 - cfg.bb_margin_y) && l.y <= (bb.y1 + cfg.bb_margin_y);
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}
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double curr_cong_weight, hist_cong_weight, estimate_weight;
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struct ThreadContext
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{
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// Nets to route
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std::vector<NetInfo *> route_nets;
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// Nets that failed routing
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std::vector<NetInfo *> failed_nets;
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std::vector<std::pair<size_t, size_t>> route_arcs;
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std::priority_queue<QueuedWire, std::vector<QueuedWire>, QueuedWire::Greater> queue;
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// Special case where one net has multiple logical arcs to the same physical sink
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std::unordered_set<WireId> processed_sinks;
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// Backwards routing
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std::queue<int> backwards_queue;
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std::vector<int> dirty_wires;
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// Thread bounding box
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ArcBounds bb;
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DeterministicRNG rng;
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};
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bool thread_test_wire(ThreadContext &t, PerWireData &w)
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{
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return w.x >= t.bb.x0 && w.x <= t.bb.x1 && w.y >= t.bb.y0 && w.y <= t.bb.y1;
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}
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enum ArcRouteResult
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{
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ARC_SUCCESS,
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ARC_RETRY_WITHOUT_BB,
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ARC_FATAL,
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};
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// Define to make sure we don't print in a multithreaded context
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#define ARC_LOG_ERR(...) \
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do { \
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if (is_mt) \
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return ARC_FATAL; \
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else \
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log_error(__VA_ARGS__); \
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} while (0)
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#define ROUTE_LOG_DBG(...) \
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do { \
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if (!is_mt && ctx->debug) \
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log(__VA_ARGS__); \
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} while (0)
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void bind_pip_internal(NetInfo *net, size_t user, int wire, PipId pip)
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{
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auto &b = flat_wires.at(wire).bound_nets[net->udata];
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++b.first;
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if (b.first == 1) {
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b.second = pip;
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} else {
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NPNR_ASSERT(b.second == pip);
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}
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}
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void unbind_pip_internal(NetInfo *net, size_t user, WireId wire)
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{
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auto &b = wire_data(wire).bound_nets.at(net->udata);
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--b.first;
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if (b.first == 0) {
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wire_data(wire).bound_nets.erase(net->udata);
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}
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}
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void ripup_arc(NetInfo *net, size_t user, size_t phys_pin)
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{
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auto &ad = nets.at(net->udata).arcs.at(user).at(phys_pin);
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if (!ad.routed)
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return;
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WireId src = nets.at(net->udata).src_wire;
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WireId cursor = ad.sink_wire;
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while (cursor != src) {
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auto &wd = wire_data(cursor);
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PipId pip = wd.bound_nets.at(net->udata).second;
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unbind_pip_internal(net, user, cursor);
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cursor = ctx->getPipSrcWire(pip);
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}
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ad.routed = false;
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}
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float score_wire_for_arc(NetInfo *net, size_t user, size_t phys_pin, WireId wire, PipId pip)
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{
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auto &wd = wire_data(wire);
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auto &nd = nets.at(net->udata);
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float base_cost = ctx->getDelayNS(ctx->getPipDelay(pip).maxDelay() + ctx->getWireDelay(wire).maxDelay() +
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ctx->getDelayEpsilon());
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float present_cost = present_wire_cost(wd, net->udata);
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float hist_cost = wd.hist_cong_cost;
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float bias_cost = 0;
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int source_uses = 0;
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if (wd.bound_nets.count(net->udata))
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source_uses = wd.bound_nets.at(net->udata).first;
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if (timing_driven) {
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float max_bound_crit = 0;
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for (auto &bound : wd.bound_nets)
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if (bound.first != net->udata)
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max_bound_crit = std::max(max_bound_crit, nets.at(bound.first).max_crit);
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if (max_bound_crit >= 0.8 && nd.arcs.at(user).at(phys_pin).arc_crit < (max_bound_crit + 0.01)) {
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present_cost *= 1.5;
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}
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}
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if (pip != PipId()) {
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Loc pl = ctx->getPipLocation(pip);
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bias_cost = cfg.bias_cost_factor * (base_cost / int(net->users.size())) *
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((std::abs(pl.x - nd.cx) + std::abs(pl.y - nd.cy)) / float(nd.hpwl));
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}
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return base_cost * hist_cost * present_cost / (1 + source_uses) + bias_cost;
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}
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float get_togo_cost(NetInfo *net, size_t user, int wire, WireId sink)
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{
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auto &wd = flat_wires[wire];
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int source_uses = 0;
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if (wd.bound_nets.count(net->udata))
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source_uses = wd.bound_nets.at(net->udata).first;
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// FIXME: timing/wirelength balance?
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return (ctx->getDelayNS(ctx->estimateDelay(wd.w, sink)) / (1 + source_uses)) + cfg.ipin_cost_adder;
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}
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bool check_arc_routing(NetInfo *net, size_t usr, size_t phys_pin)
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{
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auto &ad = nets.at(net->udata).arcs.at(usr).at(phys_pin);
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WireId src_wire = nets.at(net->udata).src_wire;
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WireId cursor = ad.sink_wire;
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while (wire_data(cursor).bound_nets.count(net->udata)) {
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auto &wd = wire_data(cursor);
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if (wd.bound_nets.size() != 1)
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return false;
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auto &uh = wd.bound_nets.at(net->udata).second;
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if (uh == PipId())
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break;
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cursor = ctx->getPipSrcWire(uh);
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}
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return (cursor == src_wire);
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}
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void record_prerouted_net(NetInfo *net, size_t usr, size_t phys_pin)
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{
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auto &ad = nets.at(net->udata).arcs.at(usr).at(phys_pin);
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ad.routed = true;
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WireId src = nets.at(net->udata).src_wire;
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WireId cursor = ad.sink_wire;
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while (cursor != src) {
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size_t wire_idx = wire_to_idx.at(cursor);
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auto &wd = flat_wires.at(wire_idx);
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PipId pip = wd.bound_nets.at(net->udata).second;
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bind_pip_internal(net, usr, wire_idx, pip);
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cursor = ctx->getPipSrcWire(pip);
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}
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}
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// Returns true if a wire contains no source ports or driving pips
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bool is_wire_undriveable(WireId wire)
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{
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for (auto bp : ctx->getWireBelPins(wire))
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if (ctx->getBelPinType(bp.bel, bp.pin) != PORT_IN)
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return false;
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for (auto p : ctx->getPipsUphill(wire))
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if (ctx->checkPipAvail(p))
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return false;
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return true;
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}
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// Find all the wires that must be used to route a given arc
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void reserve_wires_for_arc(NetInfo *net, size_t i)
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{
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WireId src = ctx->getNetinfoSourceWire(net);
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for (auto sink : ctx->getNetinfoSinkWires(net, net->users.at(i))) {
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std::unordered_set<WireId> rsv;
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WireId cursor = sink;
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bool done = false;
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if (ctx->debug)
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log("reserving wires for arc %d of net %s\n", int(i), ctx->nameOf(net));
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while (!done) {
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auto &wd = wire_data(cursor);
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if (ctx->debug)
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log(" %s\n", ctx->nameOfWire(cursor));
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wd.reserved_net = net->udata;
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if (cursor == src)
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break;
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WireId next_cursor;
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for (auto uh : ctx->getPipsUphill(cursor)) {
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WireId w = ctx->getPipSrcWire(uh);
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if (is_wire_undriveable(w))
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continue;
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if (next_cursor != WireId()) {
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done = true;
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break;
|
|
}
|
|
next_cursor = w;
|
|
}
|
|
if (next_cursor == WireId())
|
|
break;
|
|
cursor = next_cursor;
|
|
}
|
|
}
|
|
}
|
|
|
|
void find_all_reserved_wires()
|
|
{
|
|
for (auto net : nets_by_udata) {
|
|
WireId src = ctx->getNetinfoSourceWire(net);
|
|
if (src == WireId())
|
|
continue;
|
|
for (size_t i = 0; i < net->users.size(); i++)
|
|
reserve_wires_for_arc(net, i);
|
|
}
|
|
}
|
|
|
|
void reset_wires(ThreadContext &t)
|
|
{
|
|
for (auto w : t.dirty_wires) {
|
|
flat_wires[w].visit.visited = false;
|
|
flat_wires[w].visit.dirty = false;
|
|
flat_wires[w].visit.pip = PipId();
|
|
flat_wires[w].visit.score = WireScore();
|
|
}
|
|
t.dirty_wires.clear();
|
|
}
|
|
|
|
void set_visited(ThreadContext &t, int wire, PipId pip, WireScore score)
|
|
{
|
|
auto &v = flat_wires.at(wire).visit;
|
|
if (!v.dirty)
|
|
t.dirty_wires.push_back(wire);
|
|
v.dirty = true;
|
|
v.visited = true;
|
|
v.pip = pip;
|
|
v.score = score;
|
|
}
|
|
bool was_visited(int wire) { return flat_wires.at(wire).visit.visited; }
|
|
|
|
ArcRouteResult route_arc(ThreadContext &t, NetInfo *net, size_t i, size_t phys_pin, bool is_mt, bool is_bb = true)
|
|
{
|
|
|
|
auto &nd = nets[net->udata];
|
|
auto &ad = nd.arcs.at(i).at(phys_pin);
|
|
auto &usr = net->users.at(i);
|
|
ROUTE_LOG_DBG("Routing arc %d of net '%s' (%d, %d) -> (%d, %d)\n", int(i), ctx->nameOf(net), ad.bb.x0, ad.bb.y0,
|
|
ad.bb.x1, ad.bb.y1);
|
|
WireId src_wire = ctx->getNetinfoSourceWire(net), dst_wire = ctx->getNetinfoSinkWire(net, usr, phys_pin);
|
|
if (src_wire == WireId())
|
|
ARC_LOG_ERR("No wire found for port %s on source cell %s.\n", ctx->nameOf(net->driver.port),
|
|
ctx->nameOf(net->driver.cell));
|
|
if (dst_wire == WireId())
|
|
ARC_LOG_ERR("No wire found for port %s on destination cell %s.\n", ctx->nameOf(usr.port),
|
|
ctx->nameOf(usr.cell));
|
|
int src_wire_idx = wire_to_idx.at(src_wire);
|
|
int dst_wire_idx = wire_to_idx.at(dst_wire);
|
|
// Check if arc was already done _in this iteration_
|
|
if (t.processed_sinks.count(dst_wire))
|
|
return ARC_SUCCESS;
|
|
|
|
if (!t.queue.empty()) {
|
|
std::priority_queue<QueuedWire, std::vector<QueuedWire>, QueuedWire::Greater> new_queue;
|
|
t.queue.swap(new_queue);
|
|
}
|
|
if (!t.backwards_queue.empty()) {
|
|
std::queue<int> new_queue;
|
|
t.backwards_queue.swap(new_queue);
|
|
}
|
|
// First try strongly iteration-limited routing backwards BFS
|
|
// this will deal with certain nets faster than forward A*
|
|
// and comes at a minimal performance cost for the others
|
|
// This could also be used to speed up forwards routing by a hybrid
|
|
// bidirectional approach
|
|
int backwards_iter = 0;
|
|
int backwards_limit =
|
|
ctx->getBelGlobalBuf(net->driver.cell->bel) ? cfg.global_backwards_max_iter : cfg.backwards_max_iter;
|
|
t.backwards_queue.push(wire_to_idx.at(dst_wire));
|
|
while (!t.backwards_queue.empty() && backwards_iter < backwards_limit) {
|
|
int cursor = t.backwards_queue.front();
|
|
t.backwards_queue.pop();
|
|
auto &cwd = flat_wires[cursor];
|
|
PipId cpip;
|
|
if (cwd.bound_nets.count(net->udata)) {
|
|
// If we can tack onto existing routing; try that
|
|
// Only do this if the existing routing is uncontented; however
|
|
int cursor2 = cursor;
|
|
bool bwd_merge_fail = false;
|
|
while (flat_wires.at(cursor2).bound_nets.count(net->udata)) {
|
|
if (flat_wires.at(cursor2).bound_nets.size() > 1) {
|
|
bwd_merge_fail = true;
|
|
break;
|
|
}
|
|
PipId p = flat_wires.at(cursor2).bound_nets.at(net->udata).second;
|
|
if (p == PipId())
|
|
break;
|
|
cursor2 = wire_to_idx.at(ctx->getPipSrcWire(p));
|
|
}
|
|
if (!bwd_merge_fail && cursor2 == src_wire_idx) {
|
|
// Found a path to merge to existing routing; backwards
|
|
cursor2 = cursor;
|
|
while (flat_wires.at(cursor2).bound_nets.count(net->udata)) {
|
|
PipId p = flat_wires.at(cursor2).bound_nets.at(net->udata).second;
|
|
if (p == PipId())
|
|
break;
|
|
cursor2 = wire_to_idx.at(ctx->getPipSrcWire(p));
|
|
set_visited(t, cursor2, p, WireScore());
|
|
}
|
|
break;
|
|
}
|
|
cpip = cwd.bound_nets.at(net->udata).second;
|
|
}
|
|
bool did_something = false;
|
|
for (auto uh : ctx->getPipsUphill(flat_wires[cursor].w)) {
|
|
did_something = true;
|
|
if (!ctx->checkPipAvail(uh) && ctx->getBoundPipNet(uh) != net)
|
|
continue;
|
|
if (cpip != PipId() && cpip != uh)
|
|
continue; // don't allow multiple pips driving a wire with a net
|
|
int next = wire_to_idx.at(ctx->getPipSrcWire(uh));
|
|
if (was_visited(next))
|
|
continue; // skip wires that have already been visited
|
|
auto &wd = flat_wires[next];
|
|
if (wd.unavailable)
|
|
continue;
|
|
if (wd.reserved_net != -1 && wd.reserved_net != net->udata)
|
|
continue;
|
|
if (wd.bound_nets.size() > 1 || (wd.bound_nets.size() == 1 && !wd.bound_nets.count(net->udata)))
|
|
continue; // never allow congestion in backwards routing
|
|
if (!thread_test_wire(t, wd))
|
|
continue; // thread safety issue
|
|
t.backwards_queue.push(next);
|
|
set_visited(t, next, uh, WireScore());
|
|
}
|
|
if (did_something)
|
|
++backwards_iter;
|
|
}
|
|
// Check if backwards routing succeeded in reaching source
|
|
if (was_visited(src_wire_idx)) {
|
|
ROUTE_LOG_DBG(" Routed (backwards): ");
|
|
int cursor_fwd = src_wire_idx;
|
|
bind_pip_internal(net, i, src_wire_idx, PipId());
|
|
while (was_visited(cursor_fwd)) {
|
|
auto &v = flat_wires.at(cursor_fwd).visit;
|
|
cursor_fwd = wire_to_idx.at(ctx->getPipDstWire(v.pip));
|
|
bind_pip_internal(net, i, cursor_fwd, v.pip);
|
|
if (ctx->debug) {
|
|
auto &wd = flat_wires.at(cursor_fwd);
|
|
ROUTE_LOG_DBG(" wire: %s (curr %d hist %f)\n", ctx->nameOfWire(wd.w),
|
|
int(wd.bound_nets.size()) - 1, wd.hist_cong_cost);
|
|
}
|
|
}
|
|
NPNR_ASSERT(cursor_fwd == dst_wire_idx);
|
|
ad.routed = true;
|
|
t.processed_sinks.insert(dst_wire);
|
|
reset_wires(t);
|
|
return ARC_SUCCESS;
|
|
}
|
|
|
|
// Normal forwards A* routing
|
|
reset_wires(t);
|
|
WireScore base_score;
|
|
base_score.cost = 0;
|
|
base_score.delay = ctx->getWireDelay(src_wire).maxDelay();
|
|
base_score.togo_cost = get_togo_cost(net, i, src_wire_idx, dst_wire);
|
|
|
|
// Add source wire to queue
|
|
t.queue.push(QueuedWire(src_wire_idx, PipId(), Loc(), base_score));
|
|
set_visited(t, src_wire_idx, PipId(), base_score);
|
|
|
|
int toexplore = 25000 * std::max(1, (ad.bb.x1 - ad.bb.x0) + (ad.bb.y1 - ad.bb.y0));
|
|
int iter = 0;
|
|
int explored = 1;
|
|
bool debug_arc = /*usr.cell->type.str(ctx).find("RAMB") != std::string::npos && (usr.port ==
|
|
ctx->id("ADDRATIEHIGH0") || usr.port == ctx->id("ADDRARDADDRL0"))*/
|
|
false;
|
|
while (!t.queue.empty() && (!is_bb || iter < toexplore)) {
|
|
auto curr = t.queue.top();
|
|
auto &d = flat_wires.at(curr.wire);
|
|
t.queue.pop();
|
|
++iter;
|
|
#if 0
|
|
ROUTE_LOG_DBG("current wire %s\n", ctx->nameOfWire(curr.wire));
|
|
#endif
|
|
// Explore all pips downhill of cursor
|
|
for (auto dh : ctx->getPipsDownhill(d.w)) {
|
|
// Skip pips outside of box in bounding-box mode
|
|
#if 0
|
|
ROUTE_LOG_DBG("trying pip %s\n", ctx->nameOfPip(dh));
|
|
#endif
|
|
#if 0
|
|
int wire_intent = ctx->wireIntent(curr.wire);
|
|
if (is_bb && !hit_test_pip(ad.bb, ctx->getPipLocation(dh)) && wire_intent != ID_PSEUDO_GND && wire_intent != ID_PSEUDO_VCC)
|
|
continue;
|
|
#else
|
|
if (is_bb && !hit_test_pip(ad.bb, ctx->getPipLocation(dh)))
|
|
continue;
|
|
if (!ctx->checkPipAvail(dh) && ctx->getBoundPipNet(dh) != net)
|
|
continue;
|
|
#endif
|
|
// Evaluate score of next wire
|
|
WireId next = ctx->getPipDstWire(dh);
|
|
int next_idx = wire_to_idx.at(next);
|
|
if (was_visited(next_idx))
|
|
continue;
|
|
#if 1
|
|
if (debug_arc)
|
|
ROUTE_LOG_DBG(" src wire %s\n", ctx->nameOfWire(next));
|
|
#endif
|
|
auto &nwd = flat_wires.at(next_idx);
|
|
if (nwd.unavailable)
|
|
continue;
|
|
if (nwd.reserved_net != -1 && nwd.reserved_net != net->udata)
|
|
continue;
|
|
if (nwd.bound_nets.count(net->udata) && nwd.bound_nets.at(net->udata).second != dh)
|
|
continue;
|
|
if (!thread_test_wire(t, nwd))
|
|
continue; // thread safety issue
|
|
WireScore next_score;
|
|
next_score.cost = curr.score.cost + score_wire_for_arc(net, i, phys_pin, next, dh);
|
|
next_score.delay =
|
|
curr.score.delay + ctx->getPipDelay(dh).maxDelay() + ctx->getWireDelay(next).maxDelay();
|
|
next_score.togo_cost = cfg.estimate_weight * get_togo_cost(net, i, next_idx, dst_wire);
|
|
const auto &v = nwd.visit;
|
|
if (!v.visited || (v.score.total() > next_score.total())) {
|
|
++explored;
|
|
#if 0
|
|
ROUTE_LOG_DBG("exploring wire %s cost %f togo %f\n", ctx->nameOfWire(next), next_score.cost,
|
|
next_score.togo_cost);
|
|
#endif
|
|
// Add wire to queue if it meets criteria
|
|
t.queue.push(QueuedWire(next_idx, dh, ctx->getPipLocation(dh), next_score, t.rng.rng()));
|
|
set_visited(t, next_idx, dh, next_score);
|
|
if (next == dst_wire) {
|
|
toexplore = std::min(toexplore, iter + 5);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (was_visited(dst_wire_idx)) {
|
|
ROUTE_LOG_DBG(" Routed (explored %d wires): ", explored);
|
|
int cursor_bwd = dst_wire_idx;
|
|
while (was_visited(cursor_bwd)) {
|
|
auto &v = flat_wires.at(cursor_bwd).visit;
|
|
bind_pip_internal(net, i, cursor_bwd, v.pip);
|
|
if (ctx->debug) {
|
|
auto &wd = flat_wires.at(cursor_bwd);
|
|
ROUTE_LOG_DBG(" wire: %s (curr %d hist %f share %d)\n", ctx->nameOfWire(wd.w),
|
|
int(wd.bound_nets.size()) - 1, wd.hist_cong_cost,
|
|
wd.bound_nets.count(net->udata) ? wd.bound_nets.at(net->udata).first : 0);
|
|
}
|
|
if (v.pip == PipId()) {
|
|
NPNR_ASSERT(cursor_bwd == src_wire_idx);
|
|
break;
|
|
}
|
|
ROUTE_LOG_DBG(" pip: %s (%d, %d)\n", ctx->nameOfPip(v.pip), ctx->getPipLocation(v.pip).x,
|
|
ctx->getPipLocation(v.pip).y);
|
|
cursor_bwd = wire_to_idx.at(ctx->getPipSrcWire(v.pip));
|
|
}
|
|
t.processed_sinks.insert(dst_wire);
|
|
ad.routed = true;
|
|
reset_wires(t);
|
|
return ARC_SUCCESS;
|
|
} else {
|
|
reset_wires(t);
|
|
return ARC_RETRY_WITHOUT_BB;
|
|
}
|
|
}
|
|
#undef ARC_ERR
|
|
|
|
bool route_net(ThreadContext &t, NetInfo *net, bool is_mt)
|
|
{
|
|
|
|
#ifdef ARCH_ECP5
|
|
if (net->is_global)
|
|
return true;
|
|
#endif
|
|
|
|
ROUTE_LOG_DBG("Routing net '%s'...\n", ctx->nameOf(net));
|
|
|
|
auto rstart = std::chrono::high_resolution_clock::now();
|
|
|
|
// Nothing to do if net is undriven
|
|
if (net->driver.cell == nullptr)
|
|
return true;
|
|
|
|
bool have_failures = false;
|
|
t.processed_sinks.clear();
|
|
t.route_arcs.clear();
|
|
auto &nd = nets.at(net->udata);
|
|
for (size_t i = 0; i < net->users.size(); i++) {
|
|
auto &ad = nd.arcs.at(i);
|
|
for (size_t j = 0; j < ad.size(); j++) {
|
|
// Ripup failed arcs to start with
|
|
// Check if arc is already legally routed
|
|
if (check_arc_routing(net, i, j)) {
|
|
ROUTE_LOG_DBG("Arc '%s' (user %zu, arc %zu) already routed skipping.\n", ctx->nameOf(net), i, j);
|
|
continue;
|
|
}
|
|
auto &usr = net->users.at(i);
|
|
WireId dst_wire = ctx->getNetinfoSinkWire(net, usr, j);
|
|
// Case of arcs that were pre-routed strongly (e.g. clocks)
|
|
if (net->wires.count(dst_wire) && net->wires.at(dst_wire).strength > STRENGTH_STRONG)
|
|
return ARC_SUCCESS;
|
|
// Ripup arc to start with
|
|
ripup_arc(net, i, j);
|
|
t.route_arcs.emplace_back(i, j);
|
|
}
|
|
}
|
|
for (auto a : t.route_arcs) {
|
|
auto res1 = route_arc(t, net, a.first, a.second, is_mt, true);
|
|
if (res1 == ARC_FATAL)
|
|
return false; // Arc failed irrecoverably
|
|
else if (res1 == ARC_RETRY_WITHOUT_BB) {
|
|
if (is_mt) {
|
|
// Can't break out of bounding box in multi-threaded mode, so mark this arc as a failure
|
|
have_failures = true;
|
|
} else {
|
|
// Attempt a re-route without the bounding box constraint
|
|
ROUTE_LOG_DBG("Rerouting arc %d.%d of net '%s' without bounding box, possible tricky routing...\n",
|
|
int(a.first), int(a.second), ctx->nameOf(net));
|
|
auto res2 = route_arc(t, net, a.first, a.second, is_mt, false);
|
|
// If this also fails, no choice but to give up
|
|
if (res2 != ARC_SUCCESS)
|
|
log_error("Failed to route arc %d.%d of net '%s', from %s to %s.\n", int(a.first),
|
|
int(a.second), ctx->nameOf(net), ctx->nameOfWire(ctx->getNetinfoSourceWire(net)),
|
|
ctx->nameOfWire(ctx->getNetinfoSinkWire(net, net->users.at(a.first), a.second)));
|
|
}
|
|
}
|
|
}
|
|
if (cfg.perf_profile) {
|
|
auto rend = std::chrono::high_resolution_clock::now();
|
|
nets.at(net->udata).total_route_us +=
|
|
(std::chrono::duration_cast<std::chrono::microseconds>(rend - rstart).count());
|
|
}
|
|
return !have_failures;
|
|
}
|
|
#undef ROUTE_LOG_DBG
|
|
|
|
int total_wire_use = 0;
|
|
int overused_wires = 0;
|
|
int total_overuse = 0;
|
|
std::vector<int> route_queue;
|
|
std::set<int> failed_nets;
|
|
|
|
void update_congestion()
|
|
{
|
|
total_overuse = 0;
|
|
overused_wires = 0;
|
|
total_wire_use = 0;
|
|
failed_nets.clear();
|
|
for (auto &wire : flat_wires) {
|
|
total_wire_use += int(wire.bound_nets.size());
|
|
int overuse = int(wire.bound_nets.size()) - 1;
|
|
if (overuse > 0) {
|
|
wire.hist_cong_cost = std::min(1e9, wire.hist_cong_cost + overuse * hist_cong_weight);
|
|
total_overuse += overuse;
|
|
overused_wires += 1;
|
|
for (auto &bound : wire.bound_nets)
|
|
failed_nets.insert(bound.first);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool bind_and_check(NetInfo *net, int usr_idx, int phys_pin)
|
|
{
|
|
#ifdef ARCH_ECP5
|
|
if (net->is_global)
|
|
return true;
|
|
#endif
|
|
bool success = true;
|
|
auto &nd = nets.at(net->udata);
|
|
auto &ad = nd.arcs.at(usr_idx).at(phys_pin);
|
|
auto &usr = net->users.at(usr_idx);
|
|
WireId src = ctx->getNetinfoSourceWire(net);
|
|
// Skip routes with no source
|
|
if (src == WireId())
|
|
return true;
|
|
WireId dst = ctx->getNetinfoSinkWire(net, usr, phys_pin);
|
|
// Skip routes where the destination is already bound
|
|
if (dst == WireId())
|
|
return true;
|
|
if (ctx->getBoundWireNet(dst) == net) {
|
|
if (ctx->debug) {
|
|
log("Net %s already bound (because wire %s is part of net), not binding\n", ctx->nameOf(net),
|
|
ctx->nameOfWire(dst));
|
|
}
|
|
return true;
|
|
}
|
|
// Skip routes where there is no routing (special cases)
|
|
if (!ad.routed) {
|
|
if ((src == dst) && ctx->getBoundWireNet(dst) != net)
|
|
ctx->bindWire(src, net, STRENGTH_WEAK);
|
|
if (ctx->debug) {
|
|
log("Net %s not routed, not binding\n", ctx->nameOf(net));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
WireId cursor = dst;
|
|
|
|
std::vector<PipId> to_bind;
|
|
|
|
while (cursor != src) {
|
|
if (!ctx->checkWireAvail(cursor)) {
|
|
if (ctx->getBoundWireNet(cursor) == net)
|
|
break; // hit the part of the net that is already bound
|
|
else {
|
|
success = false;
|
|
break;
|
|
}
|
|
}
|
|
auto &wd = wire_data(cursor);
|
|
if (!wd.bound_nets.count(net->udata)) {
|
|
log("Failure details:\n");
|
|
log(" Cursor: %s\n", ctx->nameOfWire(cursor));
|
|
log_error("Internal error; incomplete route tree for arc %d of net %s.\n", usr_idx, ctx->nameOf(net));
|
|
}
|
|
auto &p = wd.bound_nets.at(net->udata).second;
|
|
if (!ctx->checkPipAvail(p)) {
|
|
success = false;
|
|
break;
|
|
} else {
|
|
to_bind.push_back(p);
|
|
}
|
|
cursor = ctx->getPipSrcWire(p);
|
|
}
|
|
|
|
if (success) {
|
|
if (ctx->getBoundWireNet(src) == nullptr)
|
|
ctx->bindWire(src, net, STRENGTH_WEAK);
|
|
for (auto tb : to_bind)
|
|
ctx->bindPip(tb, net, STRENGTH_WEAK);
|
|
} else {
|
|
ripup_arc(net, usr_idx, phys_pin);
|
|
failed_nets.insert(net->udata);
|
|
}
|
|
return success;
|
|
}
|
|
|
|
int arch_fail = 0;
|
|
bool bind_and_check_all()
|
|
{
|
|
bool success = true;
|
|
std::vector<WireId> net_wires;
|
|
for (auto net : nets_by_udata) {
|
|
#ifdef ARCH_ECP5
|
|
if (net->is_global)
|
|
continue;
|
|
#endif
|
|
// Ripup wires and pips used by the net in nextpnr's structures
|
|
net_wires.clear();
|
|
for (auto &w : net->wires) {
|
|
if (w.second.strength <= STRENGTH_STRONG) {
|
|
net_wires.push_back(w.first);
|
|
} else if (ctx->debug) {
|
|
log("Net %s didn't rip up wire %s because strength was %d\n", ctx->nameOf(net),
|
|
ctx->nameOfWire(w.first), w.second.strength);
|
|
}
|
|
}
|
|
for (auto w : net_wires)
|
|
ctx->unbindWire(w);
|
|
|
|
if (ctx->debug) {
|
|
log("Ripped up %zu wires on net %s\n", net_wires.size(), ctx->nameOf(net));
|
|
}
|
|
|
|
// Bind the arcs using the routes we have discovered
|
|
for (size_t i = 0; i < net->users.size(); i++) {
|
|
for (size_t phys_pin = 0; phys_pin < nets.at(net->udata).arcs.at(i).size(); phys_pin++) {
|
|
if (!bind_and_check(net, i, phys_pin)) {
|
|
++arch_fail;
|
|
success = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return success;
|
|
}
|
|
|
|
void write_heatmap(std::ostream &out, bool congestion = false)
|
|
{
|
|
std::vector<std::vector<int>> hm_xy;
|
|
int max_x = 0, max_y = 0;
|
|
for (auto &wd : flat_wires) {
|
|
int val = int(wd.bound_nets.size()) - (congestion ? 1 : 0);
|
|
if (wd.bound_nets.empty())
|
|
continue;
|
|
// Estimate wire location by driving pip location
|
|
PipId drv;
|
|
for (auto &bn : wd.bound_nets)
|
|
if (bn.second.second != PipId()) {
|
|
drv = bn.second.second;
|
|
break;
|
|
}
|
|
if (drv == PipId())
|
|
continue;
|
|
Loc l = ctx->getPipLocation(drv);
|
|
max_x = std::max(max_x, l.x);
|
|
max_y = std::max(max_y, l.y);
|
|
if (l.y >= int(hm_xy.size()))
|
|
hm_xy.resize(l.y + 1);
|
|
if (l.x >= int(hm_xy.at(l.y).size()))
|
|
hm_xy.at(l.y).resize(l.x + 1);
|
|
if (val > 0)
|
|
hm_xy.at(l.y).at(l.x) += val;
|
|
}
|
|
for (int y = 0; y <= max_y; y++) {
|
|
for (int x = 0; x <= max_x; x++) {
|
|
if (y >= int(hm_xy.size()) || x >= int(hm_xy.at(y).size()))
|
|
out << "0,";
|
|
else
|
|
out << hm_xy.at(y).at(x) << ",";
|
|
}
|
|
out << std::endl;
|
|
}
|
|
}
|
|
int mid_x = 0, mid_y = 0;
|
|
|
|
void partition_nets()
|
|
{
|
|
// Create a histogram of positions in X and Y positions
|
|
std::map<int, int> cxs, cys;
|
|
for (auto &n : nets) {
|
|
if (n.cx != -1)
|
|
++cxs[n.cx];
|
|
if (n.cy != -1)
|
|
++cys[n.cy];
|
|
}
|
|
// 4-way split for now
|
|
int accum_x = 0, accum_y = 0;
|
|
int halfway = int(nets.size()) / 2;
|
|
for (auto &p : cxs) {
|
|
if (accum_x < halfway && (accum_x + p.second) >= halfway)
|
|
mid_x = p.first;
|
|
accum_x += p.second;
|
|
}
|
|
for (auto &p : cys) {
|
|
if (accum_y < halfway && (accum_y + p.second) >= halfway)
|
|
mid_y = p.first;
|
|
accum_y += p.second;
|
|
}
|
|
if (ctx->verbose) {
|
|
log_info(" x splitpoint: %d\n", mid_x);
|
|
log_info(" y splitpoint: %d\n", mid_y);
|
|
}
|
|
std::vector<int> bins(5, 0);
|
|
for (auto &n : nets) {
|
|
if (n.bb.x0 < mid_x && n.bb.x1 < mid_x && n.bb.y0 < mid_y && n.bb.y1 < mid_y)
|
|
++bins[0]; // TL
|
|
else if (n.bb.x0 >= mid_x && n.bb.x1 >= mid_x && n.bb.y0 < mid_y && n.bb.y1 < mid_y)
|
|
++bins[1]; // TR
|
|
else if (n.bb.x0 < mid_x && n.bb.x1 < mid_x && n.bb.y0 >= mid_y && n.bb.y1 >= mid_y)
|
|
++bins[2]; // BL
|
|
else if (n.bb.x0 >= mid_x && n.bb.x1 >= mid_x && n.bb.y0 >= mid_y && n.bb.y1 >= mid_y)
|
|
++bins[3]; // BR
|
|
else
|
|
++bins[4]; // cross-boundary
|
|
}
|
|
if (ctx->verbose)
|
|
for (int i = 0; i < 5; i++)
|
|
log_info(" bin %d N=%d\n", i, bins[i]);
|
|
}
|
|
|
|
void router_thread(ThreadContext &t)
|
|
{
|
|
for (auto n : t.route_nets) {
|
|
bool result = route_net(t, n, true);
|
|
if (!result)
|
|
t.failed_nets.push_back(n);
|
|
}
|
|
}
|
|
|
|
void do_route()
|
|
{
|
|
// Don't multithread if fewer than 200 nets (heuristic)
|
|
if (route_queue.size() < 200) {
|
|
ThreadContext st;
|
|
st.rng.rngseed(ctx->rng64());
|
|
st.bb = ArcBounds(0, 0, std::numeric_limits<int>::max(), std::numeric_limits<int>::max());
|
|
for (size_t j = 0; j < route_queue.size(); j++) {
|
|
route_net(st, nets_by_udata[route_queue[j]], false);
|
|
}
|
|
return;
|
|
}
|
|
const int Nq = 4, Nv = 2, Nh = 2;
|
|
const int N = Nq + Nv + Nh;
|
|
std::vector<ThreadContext> tcs(N + 1);
|
|
for (auto &th : tcs) {
|
|
th.rng.rngseed(ctx->rng64());
|
|
}
|
|
int le_x = mid_x - cfg.bb_margin_x;
|
|
int rs_x = mid_x + cfg.bb_margin_x;
|
|
int le_y = mid_y - cfg.bb_margin_y;
|
|
int rs_y = mid_y + cfg.bb_margin_y;
|
|
// Set up thread bounding boxes
|
|
tcs.at(0).bb = ArcBounds(0, 0, mid_x, mid_y);
|
|
tcs.at(1).bb = ArcBounds(mid_x + 1, 0, std::numeric_limits<int>::max(), le_y);
|
|
tcs.at(2).bb = ArcBounds(0, mid_y + 1, mid_x, std::numeric_limits<int>::max());
|
|
tcs.at(3).bb =
|
|
ArcBounds(mid_x + 1, mid_y + 1, std::numeric_limits<int>::max(), std::numeric_limits<int>::max());
|
|
|
|
tcs.at(4).bb = ArcBounds(0, 0, std::numeric_limits<int>::max(), mid_y);
|
|
tcs.at(5).bb = ArcBounds(0, mid_y + 1, std::numeric_limits<int>::max(), std::numeric_limits<int>::max());
|
|
|
|
tcs.at(6).bb = ArcBounds(0, 0, mid_x, std::numeric_limits<int>::max());
|
|
tcs.at(7).bb = ArcBounds(mid_x + 1, 0, std::numeric_limits<int>::max(), std::numeric_limits<int>::max());
|
|
|
|
tcs.at(8).bb = ArcBounds(0, 0, std::numeric_limits<int>::max(), std::numeric_limits<int>::max());
|
|
|
|
for (auto n : route_queue) {
|
|
auto &nd = nets.at(n);
|
|
auto ni = nets_by_udata.at(n);
|
|
int bin = N;
|
|
// Quadrants
|
|
if (nd.bb.x0 < le_x && nd.bb.x1 < le_x && nd.bb.y0 < le_y && nd.bb.y1 < le_y)
|
|
bin = 0;
|
|
else if (nd.bb.x0 >= rs_x && nd.bb.x1 >= rs_x && nd.bb.y0 < le_y && nd.bb.y1 < le_y)
|
|
bin = 1;
|
|
else if (nd.bb.x0 < le_x && nd.bb.x1 < le_x && nd.bb.y0 >= rs_y && nd.bb.y1 >= rs_y)
|
|
bin = 2;
|
|
else if (nd.bb.x0 >= rs_x && nd.bb.x1 >= rs_x && nd.bb.y0 >= rs_y && nd.bb.y1 >= rs_y)
|
|
bin = 3;
|
|
// Vertical split
|
|
else if (nd.bb.y0 < le_y && nd.bb.y1 < le_y)
|
|
bin = Nq + 0;
|
|
else if (nd.bb.y0 >= rs_y && nd.bb.y1 >= rs_y)
|
|
bin = Nq + 1;
|
|
// Horizontal split
|
|
else if (nd.bb.x0 < le_x && nd.bb.x1 < le_x)
|
|
bin = Nq + Nv + 0;
|
|
else if (nd.bb.x0 >= rs_x && nd.bb.x1 >= rs_x)
|
|
bin = Nq + Nv + 1;
|
|
tcs.at(bin).route_nets.push_back(ni);
|
|
}
|
|
if (ctx->verbose)
|
|
log_info("%d/%d nets not multi-threadable\n", int(tcs.at(N).route_nets.size()), int(route_queue.size()));
|
|
#ifdef NPNR_DISABLE_THREADS
|
|
// Singlethreaded routing - quadrants
|
|
for (int i = 0; i < Nq; i++) {
|
|
router_thread(tcs.at(i));
|
|
}
|
|
// Vertical splits
|
|
for (int i = Nq; i < Nq + Nv; i++) {
|
|
router_thread(tcs.at(i));
|
|
}
|
|
// Horizontal splits
|
|
for (int i = Nq + Nv; i < Nq + Nv + Nh; i++) {
|
|
router_thread(tcs.at(i));
|
|
}
|
|
#else
|
|
// Multithreaded part of routing - quadrants
|
|
std::vector<boost::thread> threads;
|
|
for (int i = 0; i < Nq; i++) {
|
|
threads.emplace_back([this, &tcs, i]() { router_thread(tcs.at(i)); });
|
|
}
|
|
for (auto &t : threads)
|
|
t.join();
|
|
threads.clear();
|
|
// Vertical splits
|
|
for (int i = Nq; i < Nq + Nv; i++) {
|
|
threads.emplace_back([this, &tcs, i]() { router_thread(tcs.at(i)); });
|
|
}
|
|
for (auto &t : threads)
|
|
t.join();
|
|
threads.clear();
|
|
// Horizontal splits
|
|
for (int i = Nq + Nv; i < Nq + Nv + Nh; i++) {
|
|
threads.emplace_back([this, &tcs, i]() { router_thread(tcs.at(i)); });
|
|
}
|
|
for (auto &t : threads)
|
|
t.join();
|
|
threads.clear();
|
|
#endif
|
|
// Singlethreaded part of routing - nets that cross partitions
|
|
// or don't fit within bounding box
|
|
for (auto st_net : tcs.at(N).route_nets)
|
|
route_net(tcs.at(N), st_net, false);
|
|
// Failed nets
|
|
for (int i = 0; i < N; i++)
|
|
for (auto fail : tcs.at(i).failed_nets)
|
|
route_net(tcs.at(N), fail, false);
|
|
}
|
|
|
|
void operator()()
|
|
{
|
|
log_info("Running router2...\n");
|
|
log_info("Setting up routing resources...\n");
|
|
auto rstart = std::chrono::high_resolution_clock::now();
|
|
setup_nets();
|
|
setup_wires();
|
|
find_all_reserved_wires();
|
|
partition_nets();
|
|
curr_cong_weight = cfg.init_curr_cong_weight;
|
|
hist_cong_weight = cfg.hist_cong_weight;
|
|
ThreadContext st;
|
|
int iter = 1;
|
|
|
|
for (size_t i = 0; i < nets_by_udata.size(); i++)
|
|
route_queue.push_back(i);
|
|
|
|
timing_driven = ctx->setting<bool>("timing_driven");
|
|
log_info("Running main router loop...\n");
|
|
do {
|
|
ctx->sorted_shuffle(route_queue);
|
|
|
|
if (timing_driven && (int(route_queue.size()) > (int(nets_by_udata.size()) / 50))) {
|
|
// Heuristic: reduce runtime by skipping STA in the case of a "long tail" of a few
|
|
// congested nodes
|
|
get_criticalities(ctx, &net_crit);
|
|
for (auto n : route_queue) {
|
|
IdString name = nets_by_udata.at(n)->name;
|
|
auto fnd = net_crit.find(name);
|
|
auto &net = nets.at(n);
|
|
net.max_crit = 0;
|
|
if (fnd == net_crit.end())
|
|
continue;
|
|
for (int i = 0; i < int(fnd->second.criticality.size()); i++) {
|
|
float c = fnd->second.criticality.at(i);
|
|
for (auto &a : net.arcs.at(i))
|
|
a.arc_crit = c;
|
|
net.max_crit = std::max(net.max_crit, c);
|
|
}
|
|
}
|
|
std::stable_sort(route_queue.begin(), route_queue.end(),
|
|
[&](int na, int nb) { return nets.at(na).max_crit > nets.at(nb).max_crit; });
|
|
}
|
|
|
|
#if 0
|
|
for (size_t j = 0; j < route_queue.size(); j++) {
|
|
route_net(st, nets_by_udata[route_queue[j]], false);
|
|
if ((j % 1000) == 0 || j == (route_queue.size() - 1))
|
|
log(" routed %d/%d\n", int(j), int(route_queue.size()));
|
|
}
|
|
#endif
|
|
do_route();
|
|
route_queue.clear();
|
|
update_congestion();
|
|
#if 0
|
|
if (iter == 1 && ctx->debug) {
|
|
std::ofstream cong_map("cong_map_0.csv");
|
|
write_heatmap(cong_map, true);
|
|
}
|
|
#endif
|
|
if (overused_wires == 0) {
|
|
// Try and actually bind nextpnr Arch API wires
|
|
bind_and_check_all();
|
|
}
|
|
for (auto cn : failed_nets)
|
|
route_queue.push_back(cn);
|
|
log_info(" iter=%d wires=%d overused=%d overuse=%d archfail=%s\n", iter, total_wire_use, overused_wires,
|
|
total_overuse, overused_wires > 0 ? "NA" : std::to_string(arch_fail).c_str());
|
|
++iter;
|
|
if (curr_cong_weight < 1e9)
|
|
curr_cong_weight *= cfg.curr_cong_mult;
|
|
} while (!failed_nets.empty());
|
|
if (cfg.perf_profile) {
|
|
std::vector<std::pair<int, IdString>> nets_by_runtime;
|
|
for (auto &n : nets_by_udata) {
|
|
nets_by_runtime.emplace_back(nets.at(n->udata).total_route_us, n->name);
|
|
}
|
|
std::sort(nets_by_runtime.begin(), nets_by_runtime.end(), std::greater<std::pair<int, IdString>>());
|
|
log_info("1000 slowest nets by runtime:\n");
|
|
for (int i = 0; i < std::min(int(nets_by_runtime.size()), 1000); i++) {
|
|
log(" %80s %6d %.1fms\n", nets_by_runtime.at(i).second.c_str(ctx),
|
|
int(ctx->nets.at(nets_by_runtime.at(i).second)->users.size()),
|
|
nets_by_runtime.at(i).first / 1000.0);
|
|
}
|
|
}
|
|
auto rend = std::chrono::high_resolution_clock::now();
|
|
log_info("Router2 time %.02fs\n", std::chrono::duration<float>(rend - rstart).count());
|
|
|
|
log_info("Running router1 to check that route is legal...\n");
|
|
|
|
router1(ctx, Router1Cfg(ctx));
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
void router2(Context *ctx, const Router2Cfg &cfg)
|
|
{
|
|
Router2 rt(ctx, cfg);
|
|
rt.ctx = ctx;
|
|
rt();
|
|
}
|
|
|
|
Router2Cfg::Router2Cfg(Context *ctx)
|
|
{
|
|
backwards_max_iter = ctx->setting<int>("router2/bwdMaxIter", 20);
|
|
global_backwards_max_iter = ctx->setting<int>("router2/glbBwdMaxIter", 200);
|
|
bb_margin_x = ctx->setting<int>("router2/bbMargin/x", 3);
|
|
bb_margin_y = ctx->setting<int>("router2/bbMargin/y", 3);
|
|
ipin_cost_adder = ctx->setting<float>("router2/ipinCostAdder", 0.0f);
|
|
bias_cost_factor = ctx->setting<float>("router2/biasCostFactor", 0.25f);
|
|
init_curr_cong_weight = ctx->setting<float>("router2/initCurrCongWeight", 0.5f);
|
|
hist_cong_weight = ctx->setting<float>("router2/histCongWeight", 1.0f);
|
|
curr_cong_mult = ctx->setting<float>("router2/currCongWeightMult", 2.0f);
|
|
estimate_weight = ctx->setting<float>("router2/estimateWeight", 1.75f);
|
|
perf_profile = ctx->setting<bool>("router2/perfProfile", false);
|
|
}
|
|
|
|
NEXTPNR_NAMESPACE_END
|