93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
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/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2018 David Shah <david@symbioticeda.com>
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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 "place_common.h"
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#include <cmath>
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#include "log.h"
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#include "util.h"
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NEXTPNR_NAMESPACE_BEGIN
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// Get the total estimated wirelength for a net
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wirelen_t get_net_wirelength(const Context *ctx, const NetInfo *net, float &tns)
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{
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wirelen_t wirelength = 0;
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int driver_x, driver_y;
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bool driver_gb;
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CellInfo *driver_cell = net->driver.cell;
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if (!driver_cell)
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return 0;
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if (driver_cell->bel == BelId())
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return 0;
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ctx->estimatePosition(driver_cell->bel, driver_x, driver_y, driver_gb);
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WireId drv_wire = ctx->getWireBelPin(driver_cell->bel, ctx->portPinFromId(net->driver.port));
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if (driver_gb)
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return 0;
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float worst_slack = 1000;
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int xmin = driver_x, xmax = driver_x, ymin = driver_y, ymax = driver_y;
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for (auto load : net->users) {
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if (load.cell == nullptr)
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continue;
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CellInfo *load_cell = load.cell;
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if (load_cell->bel == BelId())
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continue;
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if (ctx->timing_driven) {
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WireId user_wire = ctx->getWireBelPin(load_cell->bel, ctx->portPinFromId(load.port));
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delay_t raw_wl = ctx->estimateDelay(drv_wire, user_wire);
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float slack = ctx->getDelayNS(load.budget) - ctx->getDelayNS(raw_wl);
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if (slack < 0)
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tns += slack;
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worst_slack = std::min(slack, worst_slack);
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}
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int load_x, load_y;
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bool load_gb;
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ctx->estimatePosition(load_cell->bel, load_x, load_y, load_gb);
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if (load_gb)
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continue;
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xmin = std::min(xmin, load_x);
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ymin = std::min(ymin, load_y);
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xmax = std::max(xmax, load_x);
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ymax = std::max(ymax, load_y);
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}
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if (ctx->timing_driven) {
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wirelength = wirelen_t((((ymax - ymin) + (xmax - xmin)) * std::min(5.0, (1.0 + std::exp(-worst_slack / 5)))));
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} else {
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wirelength = wirelen_t((ymax - ymin) + (xmax - xmin));
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}
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return wirelength;
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}
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// Get the total wirelength for a cell
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wirelen_t get_cell_wirelength(const Context *ctx, const CellInfo *cell)
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{
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std::set<IdString> nets;
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for (auto p : cell->ports) {
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nets.insert(p.first);
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}
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wirelen_t wirelength = 0;
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float tns = 0;
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for (auto n : nets) {
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wirelength += get_net_wirelength(ctx, ctx->nets.at(n).get(), tns);
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}
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return wirelength;
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}
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NEXTPNR_NAMESPACE_END
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