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
|
/*
* nextpnr -- Next Generation Place and Route
*
* 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.
*
*/
#ifndef PLACE_COMMON_H
#define PLACE_COMMON_H
#include "nextpnr.h"
#include <set>
NEXTPNR_NAMESPACE_BEGIN
typedef int64_t wirelen_t;
// Get the total estimated wirelength for a net
template <typename T>
wirelen_t get_net_wirelength(const T &proxy, const Context *ctx, const NetInfo *net, float &tns)
{
wirelen_t wirelength = 0;
int driver_x, driver_y;
bool driver_gb;
CellInfo *driver_cell = net->driver.cell;
if (!driver_cell)
return 0;
if (driver_cell->bel == BelId())
return 0;
ctx->estimatePosition(driver_cell->bel, driver_x, driver_y, driver_gb);
WireId drv_wire = proxy.getWireBelPin(driver_cell->bel, ctx->portPinFromId(net->driver.port));
if (driver_gb)
return 0;
float worst_slack = 1000;
int xmin = driver_x, xmax = driver_x, ymin = driver_y, ymax = driver_y;
for (auto load : net->users) {
if (load.cell == nullptr)
continue;
CellInfo *load_cell = load.cell;
if (load_cell->bel == BelId())
continue;
if (ctx->timing_driven) {
WireId user_wire = proxy.getWireBelPin(load_cell->bel, ctx->portPinFromId(load.port));
delay_t raw_wl = ctx->estimateDelay(drv_wire, user_wire);
float slack = ctx->getDelayNS(load.budget) - ctx->getDelayNS(raw_wl);
if (slack < 0)
tns += slack;
worst_slack = std::min(slack, worst_slack);
}
int load_x, load_y;
bool load_gb;
ctx->estimatePosition(load_cell->bel, load_x, load_y, load_gb);
if (load_gb)
continue;
xmin = std::min(xmin, load_x);
ymin = std::min(ymin, load_y);
xmax = std::max(xmax, load_x);
ymax = std::max(ymax, load_y);
}
if (ctx->timing_driven) {
wirelength = wirelen_t((((ymax - ymin) + (xmax - xmin)) * std::min(5.0, (1.0 + std::exp(-worst_slack / 5)))));
} else {
wirelength = wirelen_t((ymax - ymin) + (xmax - xmin));
}
return wirelength;
}
// Return the wirelength of all nets connected to a cell
template <typename T>
wirelen_t get_cell_wirelength(const T &proxy, const Context *ctx, const CellInfo *cell)
{
std::set<IdString> nets;
for (auto p : cell->ports) {
if (p.second.net)
nets.insert(p.second.net->name);
}
wirelen_t wirelength = 0;
float tns = 0;
for (auto n : nets) {
wirelength += get_net_wirelength(proxy, ctx, ctx->nets.at(n).get(), tns);
}
return wirelength;
}
// Return the wirelength of all nets connected to a cell, when the cell is at a given bel
template <typename T>
wirelen_t get_cell_wirelength_at_bel(const T &proxy, const Context *ctx, CellInfo *cell, BelId bel)
{
BelId oldBel = cell->bel;
cell->bel = bel;
wirelen_t wirelen = get_cell_wirelength(proxy, ctx, cell);
cell->bel = oldBel;
return wirelen;
}
// Place a single cell in the lowest wirelength Bel available, optionally requiring validity check
bool place_single_cell(MutateContext &proxy, Context *ctx, CellInfo *cell, bool require_legality);
NEXTPNR_NAMESPACE_END
#endif
|
