1 /* Test of isnanl() substitute.
2 Copyright (C) 2007-2021 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
18
19 #include <float.h>
20 #include <limits.h>
21
22 #include "minus-zero.h"
23 #include "infinity.h"
24 #include "nan.h"
25 #include "macros.h"
26
27 int
main()28 main ()
29 {
30 #define NWORDS \
31 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
32 typedef union { unsigned int word[NWORDS]; long double value; }
33 memory_long_double;
34
35 /* Finite values. */
36 ASSERT (!isnanl (3.141L));
37 ASSERT (!isnanl (3.141e30L));
38 ASSERT (!isnanl (3.141e-30L));
39 ASSERT (!isnanl (-2.718L));
40 ASSERT (!isnanl (-2.718e30L));
41 ASSERT (!isnanl (-2.718e-30L));
42 ASSERT (!isnanl (0.0L));
43 ASSERT (!isnanl (minus_zerol));
44 /* Infinite values. */
45 ASSERT (!isnanl (Infinityl ()));
46 ASSERT (!isnanl (- Infinityl ()));
47 /* Quiet NaN. */
48 ASSERT (isnanl (NaNl ()));
49
50 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
51 /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
52 it's a Signalling NaN. */
53 {
54 #if defined __powerpc__ && LDBL_MANT_DIG == 106
55 /* This is PowerPC "double double", a pair of two doubles. Inf and Nan are
56 represented as the corresponding 64-bit IEEE values in the first double;
57 the second is ignored. Manipulate only the first double. */
58 #undef NWORDS
59 #define NWORDS \
60 ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
61 #endif
62
63 memory_long_double m;
64 m.value = NaNl ();
65 # if LDBL_EXPBIT0_BIT > 0
66 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
67 # else
68 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
69 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
70 # endif
71 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
72 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
73 ASSERT (isnanl (m.value));
74 }
75 #endif
76
77 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
78 /* Representation of an 80-bit 'long double' as an initializer for a sequence
79 of 'unsigned int' words. */
80 # ifdef WORDS_BIGENDIAN
81 # define LDBL80_WORDS(exponent,manthi,mantlo) \
82 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
83 ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16), \
84 (unsigned int) (mantlo) << 16 \
85 }
86 # else
87 # define LDBL80_WORDS(exponent,manthi,mantlo) \
88 { mantlo, manthi, exponent }
89 # endif
90 { /* Quiet NaN. */
91 static memory_long_double x =
92 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
93 ASSERT (isnanl (x.value));
94 }
95 {
96 /* Signalling NaN. */
97 static memory_long_double x =
98 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
99 ASSERT (isnanl (x.value));
100 }
101 /* isnanl should return something for noncanonical values. */
102 { /* Pseudo-NaN. */
103 static memory_long_double x =
104 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
105 ASSERT (isnanl (x.value) || !isnanl (x.value));
106 }
107 { /* Pseudo-Infinity. */
108 static memory_long_double x =
109 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
110 ASSERT (isnanl (x.value) || !isnanl (x.value));
111 }
112 { /* Pseudo-Zero. */
113 static memory_long_double x =
114 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
115 ASSERT (isnanl (x.value) || !isnanl (x.value));
116 }
117 { /* Unnormalized number. */
118 static memory_long_double x =
119 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
120 ASSERT (isnanl (x.value) || !isnanl (x.value));
121 }
122 { /* Pseudo-Denormal. */
123 static memory_long_double x =
124 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
125 ASSERT (isnanl (x.value) || !isnanl (x.value));
126 }
127 #endif
128
129 return 0;
130 }
131