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
|
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2017 Robert Ou <rqou@robertou.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.
*
*/
#include "kernel/yosys.h"
#include "kernel/sigtools.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct RecoverReduceCorePass : public Pass {
enum GateType {
And,
Or,
Xor
};
RecoverReduceCorePass() : Pass("recover_reduce_core", "converts gate chains into $reduce_*") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" recover_reduce_core\n");
log("\n");
log("converts gate chains into $reduce_*\n");
log("\n");
log("This performs the core step of the recover_reduce command. This step recognizes\n");
log("chains of gates found by the previous steps and converts these chains into one\n");
log("logical cell.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
(void)args;
for (auto module : design->selected_modules())
{
SigMap sigmap(module);
// Index all of the nets in the module
dict<SigBit, Cell*> sig_to_driver;
dict<SigBit, pool<Cell*>> sig_to_sink;
for (auto cell : module->selected_cells())
{
for (auto &conn : cell->connections())
{
if (cell->output(conn.first))
for (auto bit : sigmap(conn.second))
sig_to_driver[bit] = cell;
if (cell->input(conn.first))
{
for (auto bit : sigmap(conn.second))
{
if (sig_to_sink.count(bit) == 0)
sig_to_sink[bit] = pool<Cell*>();
sig_to_sink[bit].insert(cell);
}
}
}
}
// Need to check if any wires connect to module ports
pool<SigBit> port_sigs;
for (auto wire : module->selected_wires())
if (wire->port_input || wire->port_output)
for (auto bit : sigmap(wire))
port_sigs.insert(bit);
// Actual logic starts here
pool<Cell*> consumed_cells;
for (auto cell : module->selected_cells())
{
if (consumed_cells.count(cell))
continue;
GateType gt;
if (cell->type == "$_AND_")
gt = GateType::And;
else if (cell->type == "$_OR_")
gt = GateType::Or;
else if (cell->type == "$_XOR_")
gt = GateType::Xor;
else
continue;
log("Working on cell %s...\n", cell->name.c_str());
}
}
}
} RecoverReduceCorePass;
PRIVATE_NAMESPACE_END
|
