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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Clifford Wolf <clifford@symbioticeda.com>
* Copyright (C) 2018 David Shah <david@symbioticeda.com>
*
* 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.
*
*/
#pragma once
#include <cstddef>
#include "nextpnr.h"
NEXTPNR_NAMESPACE_BEGIN
// FastBels is a lookup class that provides a fast lookup for finding BELs
// that support a given cell type.
struct FastBels
{
struct TypeData
{
size_t type_index;
int number_of_possible_bels;
};
FastBels(Context *ctx, bool check_bel_available, int minBelsForGridPick)
: ctx(ctx), check_bel_available(check_bel_available), minBelsForGridPick(minBelsForGridPick)
{
}
void addCellType(IdString cell_type)
{
auto iter = cell_types.find(cell_type);
if (iter != cell_types.end()) {
// This cell type has already been added to the fast BEL lookup.
return;
}
size_t type_idx = cell_types.size();
auto &cell_type_data = cell_types[cell_type];
cell_type_data.type_index = type_idx;
fast_bels_by_cell_type.resize(type_idx + 1);
auto &bel_data = fast_bels_by_cell_type.at(type_idx);
for (auto bel : ctx->getBels()) {
if (!ctx->isValidBelForCellType(cell_type, bel)) {
continue;
}
cell_type_data.number_of_possible_bels += 1;
}
for (auto bel : ctx->getBels()) {
if (check_bel_available && !ctx->checkBelAvail(bel)) {
continue;
}
if (!ctx->isValidBelForCellType(cell_type, bel)) {
continue;
}
Loc loc = ctx->getBelLocation(bel);
if (minBelsForGridPick >= 0 && cell_type_data.number_of_possible_bels < minBelsForGridPick) {
loc.x = loc.y = 0;
}
if (int(bel_data.size()) < (loc.x + 1)) {
bel_data.resize(loc.x + 1);
}
if (int(bel_data.at(loc.x).size()) < (loc.y + 1)) {
bel_data.at(loc.x).resize(loc.y + 1);
}
bel_data.at(loc.x).at(loc.y).push_back(bel);
}
}
void addBelBucket(BelBucketId partition)
{
auto iter = partition_types.find(partition);
if (iter != partition_types.end()) {
// This partition has already been added to the fast BEL lookup.
return;
}
size_t type_idx = partition_types.size();
auto &type_data = partition_types[partition];
type_data.type_index = type_idx;
fast_bels_by_partition_type.resize(type_idx + 1);
auto &bel_data = fast_bels_by_partition_type.at(type_idx);
for (auto bel : ctx->getBels()) {
if (ctx->getBelBucketForBel(bel) != partition) {
continue;
}
type_data.number_of_possible_bels += 1;
}
for (auto bel : ctx->getBels()) {
if (check_bel_available && !ctx->checkBelAvail(bel)) {
continue;
}
if (ctx->getBelBucketForBel(bel) != partition) {
continue;
}
Loc loc = ctx->getBelLocation(bel);
if (minBelsForGridPick >= 0 && type_data.number_of_possible_bels < minBelsForGridPick) {
loc.x = loc.y = 0;
}
if (int(bel_data.size()) < (loc.x + 1)) {
bel_data.resize(loc.x + 1);
}
if (int(bel_data.at(loc.x).size()) < (loc.y + 1)) {
bel_data.at(loc.x).resize(loc.y + 1);
}
bel_data.at(loc.x).at(loc.y).push_back(bel);
}
}
typedef std::vector<std::vector<std::vector<BelId>>> FastBelsData;
int getBelsForCellType(IdString cell_type, FastBelsData **data)
{
auto iter = cell_types.find(cell_type);
if (iter == cell_types.end()) {
addCellType(cell_type);
iter = cell_types.find(cell_type);
NPNR_ASSERT(iter != cell_types.end());
}
auto cell_type_data = iter->second;
*data = &fast_bels_by_cell_type.at(cell_type_data.type_index);
return cell_type_data.number_of_possible_bels;
}
size_t getBelsForBelBucket(BelBucketId partition, FastBelsData **data)
{
auto iter = partition_types.find(partition);
if (iter == partition_types.end()) {
addBelBucket(partition);
iter = partition_types.find(partition);
NPNR_ASSERT(iter != partition_types.end());
}
auto type_data = iter->second;
*data = &fast_bels_by_partition_type.at(type_data.type_index);
return type_data.number_of_possible_bels;
}
Context *ctx;
const bool check_bel_available;
const int minBelsForGridPick;
std::unordered_map<IdString, TypeData> cell_types;
std::vector<FastBelsData> fast_bels_by_cell_type;
std::unordered_map<BelBucketId, TypeData> partition_types;
std::vector<FastBelsData> fast_bels_by_partition_type;
};
NEXTPNR_NAMESPACE_END
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