1 /* Test of isnanl() substitute.
2 Copyright (C) 2007-2010 Free Software Foundation, Inc.
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.
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.
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/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
25 /* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
26 So we use minus_zero instead.
27 IRIX cc can't put -0.0L into .data, but can compute at runtime.
28 Note that the expression -LDBL_MIN * LDBL_MIN does not work on other
29 platforms, such as when cross-compiling to PowerPC on MacOS X 10.5. */
30 #if defined __hpux || defined __sgi
32 compute_minus_zero (void)
34 return -LDBL_MIN * LDBL_MIN;
36 # define minus_zero compute_minus_zero ()
38 long double minus_zero = -0.0L;
45 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
46 typedef union { unsigned int word[NWORDS]; long double value; }
50 ASSERT (!isnanl (3.141L));
51 ASSERT (!isnanl (3.141e30L));
52 ASSERT (!isnanl (3.141e-30L));
53 ASSERT (!isnanl (-2.718L));
54 ASSERT (!isnanl (-2.718e30L));
55 ASSERT (!isnanl (-2.718e-30L));
56 ASSERT (!isnanl (0.0L));
57 ASSERT (!isnanl (minus_zero));
58 /* Infinite values. */
59 ASSERT (!isnanl (1.0L / 0.0L));
60 ASSERT (!isnanl (-1.0L / 0.0L));
62 ASSERT (isnanl (NaNl ()));
64 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
65 /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
66 it's a Signalling NaN. */
70 # if LDBL_EXPBIT0_BIT > 0
71 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
73 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
74 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
76 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
77 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
78 ASSERT (isnanl (m.value));
82 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
83 /* Representation of an 80-bit 'long double' as an initializer for a sequence
84 of 'unsigned int' words. */
85 # ifdef WORDS_BIGENDIAN
86 # define LDBL80_WORDS(exponent,manthi,mantlo) \
87 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
88 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
89 (unsigned int) (mantlo) << 16 \
92 # define LDBL80_WORDS(exponent,manthi,mantlo) \
93 { mantlo, manthi, exponent }
96 static memory_long_double x =
97 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
98 ASSERT (isnanl (x.value));
101 /* Signalling NaN. */
102 static memory_long_double x =
103 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
104 ASSERT (isnanl (x.value));
106 /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
107 Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
108 Intel IA-64 Architecture Software Developer's Manual, Volume 1:
109 Application Architecture.
110 Table 5-2 "Floating-Point Register Encodings"
111 Figure 5-6 "Memory to Floating-Point Register Data Translation"
114 static memory_long_double x =
115 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
116 ASSERT (isnanl (x.value));
118 { /* Pseudo-Infinity. */
119 static memory_long_double x =
120 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
121 ASSERT (isnanl (x.value));
124 static memory_long_double x =
125 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
126 ASSERT (isnanl (x.value));
128 { /* Unnormalized number. */
129 static memory_long_double x =
130 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
131 ASSERT (isnanl (x.value));
133 { /* Pseudo-Denormal. */
134 static memory_long_double x =
135 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
136 ASSERT (isnanl (x.value));