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
|
/*
* Test 128-bit division functions
*
* Copyright (c) 2021 Instituto de Pesquisas Eldorado (eldorado.org.br)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/host-utils.h"
typedef struct {
uint64_t high;
uint64_t low;
uint64_t rhigh;
uint64_t rlow;
uint64_t divisor;
uint64_t remainder;
} test_data_unsigned;
typedef struct {
int64_t high;
uint64_t low;
int64_t rhigh;
uint64_t rlow;
int64_t divisor;
int64_t remainder;
} test_data_signed;
static const test_data_unsigned test_table_unsigned[] = {
/* Dividend fits in 64 bits */
{ 0x0000000000000000ULL, 0x0000000000000000ULL,
0x0000000000000000ULL, 0x0000000000000000ULL,
0x0000000000000001ULL, 0x0000000000000000ULL},
{ 0x0000000000000000ULL, 0x0000000000000001ULL,
0x0000000000000000ULL, 0x0000000000000001ULL,
0x0000000000000001ULL, 0x0000000000000000ULL},
{ 0x0000000000000000ULL, 0x0000000000000003ULL,
0x0000000000000000ULL, 0x0000000000000001ULL,
0x0000000000000002ULL, 0x0000000000000001ULL},
{ 0x0000000000000000ULL, 0x8000000000000000ULL,
0x0000000000000000ULL, 0x8000000000000000ULL,
0x0000000000000001ULL, 0x0000000000000000ULL},
{ 0x0000000000000000ULL, 0xa000000000000000ULL,
0x0000000000000000ULL, 0x0000000000000002ULL,
0x4000000000000000ULL, 0x2000000000000000ULL},
{ 0x0000000000000000ULL, 0x8000000000000000ULL,
0x0000000000000000ULL, 0x0000000000000001ULL,
0x8000000000000000ULL, 0x0000000000000000ULL},
/* Dividend > 64 bits, with MSB 0 */
{ 0x123456789abcdefeULL, 0xefedcba987654321ULL,
0x123456789abcdefeULL, 0xefedcba987654321ULL,
0x0000000000000001ULL, 0x0000000000000000ULL},
{ 0x123456789abcdefeULL, 0xefedcba987654321ULL,
0x0000000000000001ULL, 0x000000000000000dULL,
0x123456789abcdefeULL, 0x03456789abcdf03bULL},
{ 0x123456789abcdefeULL, 0xefedcba987654321ULL,
0x0123456789abcdefULL, 0xeefedcba98765432ULL,
0x0000000000000010ULL, 0x0000000000000001ULL},
/* Dividend > 64 bits, with MSB 1 */
{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
0x0000000000000001ULL, 0x0000000000000000ULL},
{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
0x0000000000000001ULL, 0x0000000000000000ULL,
0xfeeddccbbaa99887ULL, 0x766554433221100fULL},
{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
0x0feeddccbbaa9988ULL, 0x7766554433221100ULL,
0x0000000000000010ULL, 0x000000000000000fULL},
{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
0x000000000000000eULL, 0x00f0f0f0f0f0f35aULL,
0x123456789abcdefeULL, 0x0f8922bc55ef90c3ULL},
/**
* Divisor == 64 bits, with MSB 1
* and high 64 bits of dividend >= divisor
* (for testing normalization)
*/
{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
0x0000000000000001ULL, 0x0000000000000000ULL,
0xfeeddccbbaa99887ULL, 0x766554433221100fULL},
{ 0xfeeddccbbaa99887ULL, 0x766554433221100fULL,
0x0000000000000001ULL, 0xfddbb9977553310aULL,
0x8000000000000001ULL, 0x78899aabbccddf05ULL},
/* Dividend > 64 bits, divisor almost as big */
{ 0x0000000000000001ULL, 0x23456789abcdef01ULL,
0x0000000000000000ULL, 0x000000000000000fULL,
0x123456789abcdefeULL, 0x123456789abcde1fULL},
};
static const test_data_signed test_table_signed[] = {
/* Positive dividend, positive/negative divisors */
{ 0x0000000000000000LL, 0x0000000000bc614eULL,
0x0000000000000000LL, 0x0000000000bc614eULL,
0x0000000000000001LL, 0x0000000000000000LL},
{ 0x0000000000000000LL, 0x0000000000bc614eULL,
0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0xffffffffffffffffLL, 0x0000000000000000LL},
{ 0x0000000000000000LL, 0x0000000000bc614eULL,
0x0000000000000000LL, 0x00000000005e30a7ULL,
0x0000000000000002LL, 0x0000000000000000LL},
{ 0x0000000000000000LL, 0x0000000000bc614eULL,
0xffffffffffffffffLL, 0xffffffffffa1cf59ULL,
0xfffffffffffffffeLL, 0x0000000000000000LL},
{ 0x0000000000000000LL, 0x0000000000bc614eULL,
0x0000000000000000LL, 0x0000000000178c29ULL,
0x0000000000000008LL, 0x0000000000000006LL},
{ 0x0000000000000000LL, 0x0000000000bc614eULL,
0xffffffffffffffffLL, 0xffffffffffe873d7ULL,
0xfffffffffffffff8LL, 0x0000000000000006LL},
{ 0x0000000000000000LL, 0x0000000000bc614eULL,
0x0000000000000000LL, 0x000000000000550dULL,
0x0000000000000237LL, 0x0000000000000183LL},
{ 0x0000000000000000LL, 0x0000000000bc614eULL,
0xffffffffffffffffLL, 0xffffffffffffaaf3ULL,
0xfffffffffffffdc9LL, 0x0000000000000183LL},
/* Negative dividend, positive/negative divisors */
{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0x0000000000000001LL, 0x0000000000000000LL},
{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0x0000000000000000LL, 0x0000000000bc614eULL,
0xffffffffffffffffLL, 0x0000000000000000LL},
{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0xffffffffffffffffLL, 0xffffffffffa1cf59ULL,
0x0000000000000002LL, 0x0000000000000000LL},
{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0x0000000000000000LL, 0x00000000005e30a7ULL,
0xfffffffffffffffeLL, 0x0000000000000000LL},
{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0xffffffffffffffffLL, 0xffffffffffe873d7ULL,
0x0000000000000008LL, 0xfffffffffffffffaLL},
{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0x0000000000000000LL, 0x0000000000178c29ULL,
0xfffffffffffffff8LL, 0xfffffffffffffffaLL},
{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0xffffffffffffffffLL, 0xffffffffffffaaf3ULL,
0x0000000000000237LL, 0xfffffffffffffe7dLL},
{ 0xffffffffffffffffLL, 0xffffffffff439eb2ULL,
0x0000000000000000LL, 0x000000000000550dULL,
0xfffffffffffffdc9LL, 0xfffffffffffffe7dLL},
};
static void test_divu128(void)
{
int i;
uint64_t rem;
test_data_unsigned tmp;
for (i = 0; i < ARRAY_SIZE(test_table_unsigned); ++i) {
tmp = test_table_unsigned[i];
rem = divu128(&tmp.low, &tmp.high, tmp.divisor);
g_assert_cmpuint(tmp.low, ==, tmp.rlow);
g_assert_cmpuint(tmp.high, ==, tmp.rhigh);
g_assert_cmpuint(rem, ==, tmp.remainder);
}
}
static void test_divs128(void)
{
int i;
int64_t rem;
test_data_signed tmp;
for (i = 0; i < ARRAY_SIZE(test_table_signed); ++i) {
tmp = test_table_signed[i];
rem = divs128(&tmp.low, &tmp.high, tmp.divisor);
g_assert_cmpuint(tmp.low, ==, tmp.rlow);
g_assert_cmpuint(tmp.high, ==, tmp.rhigh);
g_assert_cmpuint(rem, ==, tmp.remainder);
}
}
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
g_test_add_func("/host-utils/test_divu128", test_divu128);
g_test_add_func("/host-utils/test_divs128", test_divs128);
return g_test_run();
}
|
