80 lines
2.6 KiB
C++
80 lines
2.6 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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* Copyright (C) 2018 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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*/
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#include "pack.h"
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#include "cells.h"
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#include "design_utils.h"
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#include "log.h"
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#include <unordered_set>
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// Pack LUTs and LUT-FF pairs
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static void pack_lut_lutffs(Design *design)
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{
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std::unordered_set<IdString> packed_cells;
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for (auto cell : design->cells) {
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CellInfo *ci = cell.second;
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if (is_lut(ci)) {
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CellInfo *packed = create_ice_cell(design, "ICESTORM_LC",
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std::string(ci->name) + "_LC");
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packed_cells.insert(ci->name);
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// See if we can pack into a DFF
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// TODO: LUT cascade
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NetInfo *o = ci->ports.at("O").net;
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CellInfo *dff = net_only_drives(o, is_ff, "D", true);
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if (dff) {
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lut_to_lc(ci, packed, false);
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dff_to_lc(dff, packed, false);
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packed_cells.insert(dff->name);
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} else {
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lut_to_lc(ci, packed, true);
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}
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}
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}
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for (auto pcell : packed_cells) {
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design->cells.erase(pcell);
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}
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}
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// Pack FFs not packed as LUTFFs
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static void pack_nonlut_ffs(Design *design)
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{
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std::unordered_set<IdString> packed_cells;
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for (auto cell : design->cells) {
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CellInfo *ci = cell.second;
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if (is_ff(ci)) {
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CellInfo *packed = create_ice_cell(design, "ICESTORM_LC",
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std::string(ci->name) + "_LC");
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packed_cells.insert(ci->name);
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dff_to_lc(ci, packed, true);
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}
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}
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for (auto pcell : packed_cells) {
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design->cells.erase(pcell);
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}
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}
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// Main pack function
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void pack_design(Design *design)
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{
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pack_lut_lutffs(design);
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pack_nonlut_ffs(design);
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}
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