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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// DESCRIPTION: Verilator: Verilog Test module
//
// Copyright 2023 by Wilson Snyder. This program is free software; you can
// redistribute it and/or modify it under the terms of either the GNU
// Lesser General Public License Version 3 or the Perl Artistic License
// Version 2.0.
// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
`define stop $stop
`define checkd(gotv,expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d: got=%0d exp=%0d\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
`define check_range(gotv,minv,maxv) do if ((gotv) < (minv) || (gotv) > (maxv)) begin $write("%%Error: %s:%0d: got=%0d exp=%0d-%0d\n", `__FILE__,`__LINE__, (gotv), (minv), (maxv)); `stop; end while(0);
`define check_within_30_percent(gotv,val) `check_range((gotv), (val) * 70 / 100, (val) * 130 / 100)
module t(/*AUTOARG*/);
localparam int COUNT = 1000;
int seq;
int counts[8];
function automatic int sfunc();
int o = 2;
randsequence(main)
main : one;
one : { o = 1; };
endsequence
return o;
endfunction
task prep();
for (int i = 0; i < COUNT; ++i) counts[i] = 0;
endtask
initial begin;
if (sfunc() != 1) $stop;
// simple
prep();
seq = 0;
randsequence(main)
main: one two three;
two: { `checkd(seq, 1); seq = 2; };
one: { `checkd(seq, 0); seq = 1; };
three: { `checkd(seq, 2); seq = 3; };
endsequence
`checkd(seq, 3);
// simple unnamed
prep();
seq = 0;
randsequence()
unnamed: { seq = 2; };
endsequence
`checkd(seq, 2);
// empty block
prep();
randsequence()
unnamed: { };
endsequence
// weight
prep();
for (int i = 0; i < COUNT; ++i) begin
randsequence(main)
main: one | two | three := 2;
one: { ++counts[0]; };
two: { ++counts[1]; };
three: { ++counts[2]; };
endsequence
end
`check_within_30_percent(counts[0], COUNT * 1 / 4);
`check_within_30_percent(counts[1], COUNT * 1 / 4);
`check_within_30_percent(counts[2], COUNT * 2 / 4);
// case
prep();
for (int i = 0; i < COUNT; ++i) begin
randsequence(main)
main: one_if;
one_if: if (i % 10 == 0) count_1 else most;
count_1: { ++counts[1]; };
count_2: { ++counts[2]; };
count_3: { ++counts[3]; };
count_4: { ++counts[4]; };
bad: { $stop; };
most: case (i % 10)
0: bad;
1, 2: count_2;
3, 4, 5: count_3;
default: count_4;
endcase;
endsequence
end
`check_within_30_percent(counts[1], COUNT * 1 / 10);
`check_within_30_percent(counts[2], COUNT * 2 / 10);
`check_within_30_percent(counts[3], COUNT * 3 / 10);
`check_within_30_percent(counts[4], COUNT * 4 / 10);
// case - different default
prep();
for (int i = 0; i < COUNT; ++i) begin
randsequence(main)
main: one_if;
one_if: if (i % 10 == 0) count_1 else most;
count_1: { ++counts[1]; };
count_2: { ++counts[2]; };
count_3: { ++counts[3]; };
count_4: { ++counts[4]; };
bad: { $stop; };
most: case (i % 10)
0: bad;
1, 2: count_2;
3, 4, 5: count_3;
default count_4; // No :
endcase;
endsequence
end
`check_within_30_percent(counts[1], COUNT * 1 / 10);
`check_within_30_percent(counts[2], COUNT * 2 / 10);
`check_within_30_percent(counts[3], COUNT * 3 / 10);
`check_within_30_percent(counts[4], COUNT * 4 / 10);
// repeat
prep();
randsequence(main)
main: repeat(10) count_1;
count_1: { ++counts[1]; };
endsequence
`checkd(counts[1], 10);
// rand join
prep();
for (int i = 0; i < COUNT; ++i) begin
randsequence(main)
main: rand join count_1 count_2;
count_1: { ++counts[1]; };
count_2: { ++counts[2]; };
endsequence
end
`check_within_30_percent(counts[1], COUNT * 1 / 1);
`check_within_30_percent(counts[2], COUNT * 1 / 1);
// rand join weight (TODO weight not tested yet)
prep();
for (int i = 0; i < COUNT; ++i) begin
randsequence(main)
main: rand join (1.0) count_1 count_2;
count_1: { ++counts[1]; };
count_2: { ++counts[2]; };
endsequence
randsequence(main)
main: rand join (0.0) count_3 count_4;
count_3: { ++counts[3]; };
count_4: { ++counts[4]; };
endsequence
end
`check_within_30_percent(counts[1], COUNT * 1 / 1);
`check_within_30_percent(counts[2], COUNT * 1 / 1);
`check_within_30_percent(counts[3], COUNT * 1 / 1);
`check_within_30_percent(counts[4], COUNT * 1 / 1);
// break
prep();
for (int i = 0; i < COUNT; ++i) begin
automatic bit fiftyfifty = i[0];
randsequence(main)
main: count_1 check count_2;
check: count_3 { if (fiftyfifty) break; } count_4;
count_1: { ++counts[1]; };
count_2: { ++counts[2]; };
count_3: { ++counts[3]; };
count_4: { ++counts[4]; };
endsequence
end
`checkd(counts[1], COUNT * 1 / 1);
`checkd(counts[2], COUNT * 1 / 2); // break
`checkd(counts[3], COUNT * 1 / 1);
`checkd(counts[4], COUNT * 1 / 2); // break or return
// return
prep();
for (int i = 0; i < COUNT; ++i) begin
automatic bit fiftyfifty = i[0];
randsequence(main)
main: count_1 check count_2;
check: count_3 { if (fiftyfifty) return; } count_4;
count_1: { ++counts[1]; };
count_2: { ++counts[2]; };
count_3: { ++counts[3]; };
count_4: { ++counts[4]; };
endsequence
end
`checkd(counts[1], COUNT * 1 / 1);
`checkd(counts[2], COUNT * 1 / 1); // return
`checkd(counts[3], COUNT * 1 / 1);
`checkd(counts[4], COUNT * 1 / 2); // break or return
// functions
prep();
for (int i = 0; i < COUNT; ++i) begin
randsequence(main)
main: f_1 f_2 f_3;
f_1 : func(10);
f_2 : func(20);
f_3 : fnoarg;
void func(int n) : { counts[1] += n; };
void fnoarg : { ++counts[2]; };
endsequence
end
`checkd(counts[1], COUNT * (10 + 20));
`checkd(counts[2], COUNT * 1 / 1); // return
$write("*-* All Finished *-*\n");
$finish;
end
endmodule
|
