aboutsummaryrefslogtreecommitdiffstats
path: root/common/fast_bels.h
blob: be2852cd5940a6379a666a66d078b6bfeb4026dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/*
 *  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