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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/* Test for correct rounding of printf floating-point output.
Copyright (C) 2012-2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C 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.
The GNU C 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 the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
#include <fenv.h>
#include <stdio.h>
#include <string.h>
struct dec_test {
double d;
const char *fmt;
const char *rd, *rn, *rz, *ru;
};
static const struct dec_test dec_tests[] = {
{ 1.5, "%.0f", "1", "2", "1", "2" },
{ -1.5, "%.0f", "-2", "-2", "-1", "-1" },
{ 2.5, "%.0f", "2", "2", "2", "3" },
{ -2.5, "%.0f", "-3", "-2", "-2", "-2" },
{ 1.4999, "%.0f", "1", "1", "1", "2" },
{ -1.4999, "%.0f", "-2", "-1", "-1", "-1" },
{ 1.5001, "%.0f", "1", "2", "1", "2" },
{ -1.5001, "%.0f", "-2", "-2", "-1", "-1" },
{ 2.4999, "%.0f", "2", "2", "2", "3" },
{ -2.4999, "%.0f", "-3", "-2", "-2", "-2" },
{ 2.5001, "%.0f", "2", "3", "2", "3" },
{ -2.5001, "%.0f", "-3", "-3", "-2", "-2" },
{ 1.0 / 3.0, "%f", "0.333333", "0.333333", "0.333333", "0.333334" },
{ -1.0 / 3.0, "%f", "-0.333334", "-0.333333", "-0.333333", "-0.333333" },
{ 0.2500001, "%.2e", "2.50e-01", "2.50e-01", "2.50e-01", "2.51e-01" },
{ -0.2500001, "%.2e", "-2.51e-01", "-2.50e-01", "-2.50e-01", "-2.50e-01" },
{ 1000001.0, "%.1e", "1.0e+06", "1.0e+06", "1.0e+06", "1.1e+06" },
{ -1000001.0, "%.1e", "-1.1e+06", "-1.0e+06", "-1.0e+06", "-1.0e+06" },
};
static int
test_dec_in_one_mode (double d, const char *fmt, const char *expected,
const char *mode_name)
{
char buf[100];
int ret = snprintf (buf, sizeof buf, fmt, d);
if (ret <= 0 || ret >= (int) sizeof buf)
{
printf ("snprintf for %a returned %d\n", d, ret);
return 1;
}
if (strcmp (buf, expected) == 0)
return 0;
else
{
printf ("snprintf (\"%s\", %a) returned \"%s\" not \"%s\" (%s)\n",
fmt, d, buf, expected, mode_name);
return 1;
}
}
struct hex_test
{
double d;
const char *fmt;
const char *rd[4], *rn[4], *rz[4], *ru[4];
};
static const struct hex_test hex_tests[] =
{
{
0x1.fffffp+4, "%.1a",
{ "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" },
{ "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" },
{ "0x1.fp+4", "0x3.fp+3", "0x7.fp+2", "0xf.fp+1" },
{ "0x2.0p+4", "0x4.0p+3", "0x8.0p+2", "0x1.0p+5" }
},
{
-0x1.fffffp+4, "%.1a",
{ "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" },
{ "-0x2.0p+4", "-0x4.0p+3", "-0x8.0p+2", "-0x1.0p+5" },
{ "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" },
{ "-0x1.fp+4", "-0x3.fp+3", "-0x7.fp+2", "-0xf.fp+1" }
},
{
0x1.88p+4, "%.1a",
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
{ "0x1.8p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" },
{ "0x1.9p+4", "0x3.1p+3", "0x6.2p+2", "0xc.4p+1" }
},
{
-0x1.88p+4, "%.1a",
{ "-0x1.9p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" },
{ "-0x1.8p+4", "-0x3.1p+3", "-0x6.2p+2", "-0xc.4p+1" }
},
{
0x1.78p+4, "%.1a",
{ "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
{ "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
{ "0x1.7p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" },
{ "0x1.8p+4", "0x2.fp+3", "0x5.ep+2", "0xb.cp+1" }
},
{
-0x1.78p+4, "%.1a",
{ "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
{ "-0x1.8p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
{ "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" },
{ "-0x1.7p+4", "-0x2.fp+3", "-0x5.ep+2", "-0xb.cp+1" }
},
{
64.0 / 3.0, "%.1a",
{ "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" },
{ "0x1.5p+4", "0x2.bp+3", "0x5.5p+2", "0xa.bp+1" },
{ "0x1.5p+4", "0x2.ap+3", "0x5.5p+2", "0xa.ap+1" },
{ "0x1.6p+4", "0x2.bp+3", "0x5.6p+2", "0xa.bp+1" }
},
{
-64.0 / 3.0, "%.1a",
{ "-0x1.6p+4", "-0x2.bp+3", "-0x5.6p+2", "-0xa.bp+1" },
{ "-0x1.5p+4", "-0x2.bp+3", "-0x5.5p+2", "-0xa.bp+1" },
{ "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" },
{ "-0x1.5p+4", "-0x2.ap+3", "-0x5.5p+2", "-0xa.ap+1" }
},
};
static int
test_hex_in_one_mode (double d, const char *fmt, const char *const expected[4],
const char *mode_name)
{
char buf[100];
int ret = snprintf (buf, sizeof buf, fmt, d);
if (ret <= 0 || ret >= (int) sizeof buf)
{
printf ("snprintf for %a returned %d\n", d, ret);
return 1;
}
if (strcmp (buf, expected[0]) == 0
|| strcmp (buf, expected[1]) == 0
|| strcmp (buf, expected[2]) == 0
|| strcmp (buf, expected[3]) == 0)
return 0;
else
{
printf ("snprintf (\"%s\", %a) returned \"%s\" not "
"\"%s\" or \"%s\" or \"%s\" or \"%s\" (%s)\n",
fmt, d, buf, expected[0], expected[1], expected[2], expected[3],
mode_name);
return 1;
}
}
static int
do_test (void)
{
int save_round_mode __attribute__ ((unused)) = fegetround ();
int result = 0;
for (size_t i = 0; i < array_length (dec_tests); i++)
{
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
dec_tests[i].rn, "default rounding mode");
#ifdef FE_DOWNWARD
if (!fesetround (FE_DOWNWARD))
{
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
dec_tests[i].rd, "FE_DOWNWARD");
fesetround (save_round_mode);
}
#endif
#ifdef FE_TOWARDZERO
if (!fesetround (FE_TOWARDZERO))
{
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
dec_tests[i].rz, "FE_TOWARDZERO");
fesetround (save_round_mode);
}
#endif
#ifdef FE_UPWARD
if (!fesetround (FE_UPWARD))
{
result |= test_dec_in_one_mode (dec_tests[i].d, dec_tests[i].fmt,
dec_tests[i].ru, "FE_UPWARD");
fesetround (save_round_mode);
}
#endif
}
for (size_t i = 0; i < array_length (hex_tests); i++)
{
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
hex_tests[i].rn, "default rounding mode");
#ifdef FE_DOWNWARD
if (!fesetround (FE_DOWNWARD))
{
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
hex_tests[i].rd, "FE_DOWNWARD");
fesetround (save_round_mode);
}
#endif
#ifdef FE_TOWARDZERO
if (!fesetround (FE_TOWARDZERO))
{
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
hex_tests[i].rz, "FE_TOWARDZERO");
fesetround (save_round_mode);
}
#endif
#ifdef FE_UPWARD
if (!fesetround (FE_UPWARD))
{
result |= test_hex_in_one_mode (hex_tests[i].d, hex_tests[i].fmt,
hex_tests[i].ru, "FE_UPWARD");
fesetround (save_round_mode);
}
#endif
}
return result;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|
