-
Notifications
You must be signed in to change notification settings - Fork 522
/
PDelays.cc
141 lines (120 loc) · 3.54 KB
/
PDelays.cc
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
/*
* Copyright (c) 1999 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: PDelays.cc,v 1.4 2001/01/20 02:15:50 steve Exp $"
#endif
# include "PDelays.h"
# include "PExpr.h"
# include "verinum.h"
PDelays::PDelays()
{
for (unsigned idx = 0 ; idx < 3 ; idx += 1)
delay_[idx] = 0;
}
PDelays::~PDelays()
{
for (unsigned idx = 0 ; idx < 3 ; idx += 1)
delete delay_[idx];
}
void PDelays::set_delay(PExpr*del)
{
assert(del);
assert(delay_[0] == 0);
delay_[0] = del;
}
void PDelays::set_delays(const svector<PExpr*>*del)
{
assert(del);
assert(del->count() <= 3);
for (unsigned idx = 0 ; idx < del->count() ; idx += 1)
delay_[idx] = (*del)[idx];
}
static unsigned long calculate_val(Design*des, const NetScope*scope,
const PExpr*expr)
{
assert(expr);
unsigned long val;
int shift = scope->time_unit() - des->get_precision();
if (verireal*dr = expr->eval_rconst(des, scope)) {
val = dr->as_long(shift);
delete dr;
} else {
verinum*dv = expr->eval_const(des, scope->name());
if (dv == 0) {
cerr << expr->get_line() << ": sorry: non-constant "
<< "delays not supported here: " << *expr << endl;
des->errors += 1;
return 0;
}
assert(dv);
val = dv->as_ulong();
val = des->scale_to_precision(val, scope);
delete dv;
}
return val;
}
void PDelays::eval_delays(Design*des, const string&path,
unsigned long&rise_time,
unsigned long&fall_time,
unsigned long&decay_time) const
{
NetScope*scope = des->find_scope(path);
assert(scope);
int shift = scope->time_unit() - des->get_precision();
if (delay_[0]) {
rise_time = calculate_val(des, scope, delay_[0]);
if (delay_[1]) {
fall_time = calculate_val(des, scope, delay_[1]);
if (delay_[2]) {
decay_time = calculate_val(des, scope, delay_[2]);
} else {
if (rise_time < fall_time)
decay_time = rise_time;
else
decay_time = fall_time;
}
} else {
assert(delay_[2] == 0);
fall_time = rise_time;
decay_time = rise_time;
}
} else {
rise_time = 0;
fall_time = 0;
decay_time = 0;
}
}
/*
* $Log: PDelays.cc,v $
* Revision 1.4 2001/01/20 02:15:50 steve
* apologize for not supporting non-constant delays.
*
* Revision 1.3 2001/01/14 23:04:55 steve
* Generalize the evaluation of floating point delays, and
* get it working with delay assignment statements.
*
* Allow parameters to be referenced by hierarchical name.
*
* Revision 1.2 2000/02/23 02:56:53 steve
* Macintosh compilers do not support ident.
*
* Revision 1.1 1999/09/04 19:11:46 steve
* Add support for delayed non-blocking assignments.
*
*/