tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
lib/math/test_div64: add some edge cases relevant to __div64_const32()
Be sure to test the extreme cases with and without bias.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
authored by
Nicolas Pitre
and committed by
Arnd Bergmann
1dc82675
3e25d5a4
+83
-2
+83
-2
lib/math/test_div64.c
+83
-2
lib/math/test_div64.c
···
26
26
0x0072db27380dd689,
27
27
0x0842f488162e2284,
28
28
0xf66745411d8ab063,
29
+
0xfffffffffffffffb,
30
+
0xfffffffffffffffc,
31
+
0xffffffffffffffff,
29
32
};
30
33
#define SIZE_DIV64_DIVIDENDS ARRAY_SIZE(test_div64_dividends)
31
34
···
40
37
#define TEST_DIV64_DIVISOR_5 0x0008a880
41
38
#define TEST_DIV64_DIVISOR_6 0x003fd3ae
42
39
#define TEST_DIV64_DIVISOR_7 0x0b658fac
43
-
#define TEST_DIV64_DIVISOR_8 0xdc08b349
40
+
#define TEST_DIV64_DIVISOR_8 0x80000001
41
+
#define TEST_DIV64_DIVISOR_9 0xdc08b349
42
+
#define TEST_DIV64_DIVISOR_A 0xfffffffe
43
+
#define TEST_DIV64_DIVISOR_B 0xffffffff
44
44
45
45
static const u32 test_div64_divisors[] = {
46
46
TEST_DIV64_DIVISOR_0,
···
55
49
TEST_DIV64_DIVISOR_6,
56
50
TEST_DIV64_DIVISOR_7,
57
51
TEST_DIV64_DIVISOR_8,
52
+
TEST_DIV64_DIVISOR_9,
53
+
TEST_DIV64_DIVISOR_A,
54
+
TEST_DIV64_DIVISOR_B,
58
55
};
59
56
#define SIZE_DIV64_DIVISORS ARRAY_SIZE(test_div64_divisors)
60
57
61
58
static const struct {
62
59
u64 quotient;
63
60
u32 remainder;
64
-
} test_div64_results[SIZE_DIV64_DIVISORS][SIZE_DIV64_DIVIDENDS] = {
61
+
} test_div64_results[SIZE_DIV64_DIVIDENDS][SIZE_DIV64_DIVISORS] = {
65
62
{
66
63
{ 0x0000000013045e47, 0x00000001 },
67
64
{ 0x000000000161596c, 0x00000030 },
···
74
65
{ 0x00000000000013c4, 0x0004ce80 },
75
66
{ 0x00000000000002ae, 0x001e143c },
76
67
{ 0x000000000000000f, 0x0033e56c },
68
+
{ 0x0000000000000001, 0x2b27507f },
69
+
{ 0x0000000000000000, 0xab275080 },
70
+
{ 0x0000000000000000, 0xab275080 },
77
71
{ 0x0000000000000000, 0xab275080 },
78
72
}, {
79
73
{ 0x00000001c45c02d1, 0x00000000 },
···
87
75
{ 0x000000000001d637, 0x0004e5d9 },
88
76
{ 0x0000000000003fc9, 0x000713bb },
89
77
{ 0x0000000000000165, 0x029abe7d },
78
+
{ 0x000000000000001f, 0x673c193a },
90
79
{ 0x0000000000000012, 0x6e9f7e37 },
80
+
{ 0x000000000000000f, 0xe73c1977 },
81
+
{ 0x000000000000000f, 0xe73c1968 },
91
82
}, {
92
83
{ 0x000000197a3a0cf7, 0x00000002 },
93
84
{ 0x00000001d9632e5c, 0x00000021 },
···
100
85
{ 0x00000000001a7bb3, 0x00072331 },
101
86
{ 0x00000000000397ad, 0x0002c61b },
102
87
{ 0x000000000000141e, 0x06ea2e89 },
88
+
{ 0x00000000000001ca, 0x4c0a72e7 },
103
89
{ 0x000000000000010a, 0xab002ad7 },
90
+
{ 0x00000000000000e5, 0x4c0a767b },
91
+
{ 0x00000000000000e5, 0x4c0a7596 },
104
92
}, {
105
93
{ 0x0000017949e37538, 0x00000001 },
106
94
{ 0x0000001b62441f37, 0x00000055 },
···
113
95
{ 0x0000000001882ec6, 0x0005cbf9 },
114
96
{ 0x000000000035333b, 0x0017abdf },
115
97
{ 0x00000000000129f1, 0x0ab4520d },
98
+
{ 0x0000000000001a87, 0x18ff0472 },
116
99
{ 0x0000000000000f6e, 0x8ac0ce9b },
100
+
{ 0x0000000000000d43, 0x98ff397f },
101
+
{ 0x0000000000000d43, 0x98ff2c3c },
117
102
}, {
118
103
{ 0x000011f321a74e49, 0x00000006 },
119
104
{ 0x0000014d8481d211, 0x0000005b },
···
126
105
{ 0x0000000012a88828, 0x00036c97 },
127
106
{ 0x000000000287f16f, 0x002c2a25 },
128
107
{ 0x00000000000e2cc7, 0x02d581e3 },
108
+
{ 0x0000000000014318, 0x2ee07d7f },
129
109
{ 0x000000000000bbf4, 0x1ba08c03 },
110
+
{ 0x000000000000a18c, 0x2ee303af },
111
+
{ 0x000000000000a18c, 0x2ee26223 },
130
112
}, {
131
113
{ 0x0000d8db8f72935d, 0x00000005 },
132
114
{ 0x00000fbd5aed7a2e, 0x00000002 },
···
139
115
{ 0x00000000e16b20fa, 0x0002a14a },
140
116
{ 0x000000001e940d22, 0x00353b2e },
141
117
{ 0x0000000000ab40ac, 0x06fba6ba },
118
+
{ 0x00000000000f3f70, 0x0af7eeda },
142
119
{ 0x000000000008debd, 0x72d98365 },
120
+
{ 0x0000000000079fb8, 0x0b166dba },
121
+
{ 0x0000000000079fb8, 0x0b0ece02 },
143
122
}, {
144
123
{ 0x000cc3045b8fc281, 0x00000000 },
145
124
{ 0x0000ed1f48b5c9fc, 0x00000079 },
···
152
125
{ 0x0000000d43fce827, 0x00082b09 },
153
126
{ 0x00000001ccaba11a, 0x0037e8dd },
154
127
{ 0x000000000a13f729, 0x0566dffd },
128
+
{ 0x0000000000e5b64e, 0x3728203b },
155
129
{ 0x000000000085a14b, 0x23d36726 },
130
+
{ 0x000000000072db27, 0x38f38cd7 },
131
+
{ 0x000000000072db27, 0x3880b1b0 },
156
132
}, {
157
133
{ 0x00eafeb9c993592b, 0x00000001 },
158
134
{ 0x00110e5befa9a991, 0x00000048 },
···
165
135
{ 0x000000f4459740fc, 0x00084484 },
166
136
{ 0x0000002122c47bf9, 0x002ca446 },
167
137
{ 0x00000000b9936290, 0x004979c4 },
138
+
{ 0x000000001085e910, 0x05a83974 },
168
139
{ 0x00000000099ca89d, 0x9db446bf },
140
+
{ 0x000000000842f488, 0x26b40b94 },
141
+
{ 0x000000000842f488, 0x1e71170c },
169
142
}, {
170
143
{ 0x1b60cece589da1d2, 0x00000001 },
171
144
{ 0x01fcb42be1453f5b, 0x0000004f },
···
178
145
{ 0x00001c757dfab350, 0x00048863 },
179
146
{ 0x000003dc4979c652, 0x00224ea7 },
180
147
{ 0x000000159edc3144, 0x06409ab3 },
148
+
{ 0x00000001ecce8a7e, 0x30bc25e5 },
181
149
{ 0x000000011eadfee3, 0xa99c48a8 },
150
+
{ 0x00000000f6674543, 0x0a593ae9 },
151
+
{ 0x00000000f6674542, 0x13f1f5a5 },
152
+
}, {
153
+
{ 0x1c71c71c71c71c71, 0x00000002 },
154
+
{ 0x0210842108421084, 0x0000000b },
155
+
{ 0x007f01fc07f01fc0, 0x000000fb },
156
+
{ 0x00014245eabf1f9a, 0x0000a63d },
157
+
{ 0x0000ffffffffffff, 0x0000fffb },
158
+
{ 0x00001d913cecc509, 0x0007937b },
159
+
{ 0x00000402c70c678f, 0x0005bfc9 },
160
+
{ 0x00000016766cb70b, 0x045edf97 },
161
+
{ 0x00000001fffffffb, 0x80000000 },
162
+
{ 0x0000000129d84b3a, 0xa2e8fe71 },
163
+
{ 0x0000000100000001, 0xfffffffd },
164
+
{ 0x0000000100000000, 0xfffffffb },
165
+
}, {
166
+
{ 0x1c71c71c71c71c71, 0x00000003 },
167
+
{ 0x0210842108421084, 0x0000000c },
168
+
{ 0x007f01fc07f01fc0, 0x000000fc },
169
+
{ 0x00014245eabf1f9a, 0x0000a63e },
170
+
{ 0x0000ffffffffffff, 0x0000fffc },
171
+
{ 0x00001d913cecc509, 0x0007937c },
172
+
{ 0x00000402c70c678f, 0x0005bfca },
173
+
{ 0x00000016766cb70b, 0x045edf98 },
174
+
{ 0x00000001fffffffc, 0x00000000 },
175
+
{ 0x0000000129d84b3a, 0xa2e8fe72 },
176
+
{ 0x0000000100000002, 0x00000000 },
177
+
{ 0x0000000100000000, 0xfffffffc },
178
+
}, {
179
+
{ 0x1c71c71c71c71c71, 0x00000006 },
180
+
{ 0x0210842108421084, 0x0000000f },
181
+
{ 0x007f01fc07f01fc0, 0x000000ff },
182
+
{ 0x00014245eabf1f9a, 0x0000a641 },
183
+
{ 0x0000ffffffffffff, 0x0000ffff },
184
+
{ 0x00001d913cecc509, 0x0007937f },
185
+
{ 0x00000402c70c678f, 0x0005bfcd },
186
+
{ 0x00000016766cb70b, 0x045edf9b },
187
+
{ 0x00000001fffffffc, 0x00000003 },
188
+
{ 0x0000000129d84b3a, 0xa2e8fe75 },
189
+
{ 0x0000000100000002, 0x00000003 },
190
+
{ 0x0000000100000001, 0x00000000 },
182
191
},
183
192
};
184
193
···
282
207
if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_7, i, 7))
283
208
return false;
284
209
if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_8, i, 8))
210
+
return false;
211
+
if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_9, i, 9))
212
+
return false;
213
+
if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_A, i, 10))
214
+
return false;
215
+
if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_B, i, 11))
285
216
return false;
286
217
for (j = 0; j < SIZE_DIV64_DIVISORS; j++) {
287
218
if (!test_div64_one(dividend, test_div64_divisors[j],