1 /* Test of isnanl() substitute.
2 Copyright (C) 2007-2014 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 <http://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 memory_long_double m;
55 m.value = NaNl ();
56 # if LDBL_EXPBIT0_BIT > 0
57 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
58 # else
59 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
60 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
61 # endif
62 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
63 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
64 ASSERT (isnanl (m.value));
65 }
66 #endif
67
68 #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
69 /* Representation of an 80-bit 'long double' as an initializer for a sequence
70 of 'unsigned int' words. */
71 # ifdef WORDS_BIGENDIAN
72 # define LDBL80_WORDS(exponent,manthi,mantlo) \
73 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
74 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
75 (unsigned int) (mantlo) << 16 \
76 }
77 # else
78 # define LDBL80_WORDS(exponent,manthi,mantlo) \
79 { mantlo, manthi, exponent }
80 # endif
81 { /* Quiet NaN. */
82 static memory_long_double x =
83 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
84 ASSERT (isnanl (x.value));
85 }
86 {
87 /* Signalling NaN. */
88 static memory_long_double x =
89 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
90 ASSERT (isnanl (x.value));
91 }
92 /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
93 Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
94 Intel IA-64 Architecture Software Developer's Manual, Volume 1:
95 Application Architecture.
96 Table 5-2 "Floating-Point Register Encodings"
97 Figure 5-6 "Memory to Floating-Point Register Data Translation"
98 */
99 { /* Pseudo-NaN. */
100 static memory_long_double x =
101 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
102 ASSERT (isnanl (x.value));
103 }
104 { /* Pseudo-Infinity. */
105 static memory_long_double x =
106 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
107 ASSERT (isnanl (x.value));
108 }
109 { /* Pseudo-Zero. */
110 static memory_long_double x =
111 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
112 ASSERT (isnanl (x.value));
113 }
114 { /* Unnormalized number. */
115 static memory_long_double x =
116 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
117 ASSERT (isnanl (x.value));
118 }
119 { /* Pseudo-Denormal. */
120 static memory_long_double x =
121 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
122 ASSERT (isnanl (x.value));
123 }
124 #endif
125
126 return 0;
127 }
128