1 /* Test of isnanl() substitute.
2 Copyright (C) 2007 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. */
24 #define ASSERT(expr) \
29 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
39 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
40 typedef union { unsigned int word[NWORDS]; long double value; }
44 ASSERT (!isnanl (3.141L));
45 ASSERT (!isnanl (3.141e30L));
46 ASSERT (!isnanl (3.141e-30L));
47 ASSERT (!isnanl (-2.718L));
48 ASSERT (!isnanl (-2.718e30L));
49 ASSERT (!isnanl (-2.718e-30L));
50 /* Infinite values. */
51 ASSERT (!isnanl (1.0L / 0.0L));
52 ASSERT (!isnanl (-1.0L / 0.0L));
54 ASSERT (isnanl (0.0L / 0.0L));
56 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
57 /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
58 it's a Signalling NaN. */
61 m.value = 0.0L / 0.0L;
62 # if LDBL_EXPBIT0_BIT > 0
63 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
65 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
66 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
68 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
69 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
70 ASSERT (isnanl (m.value));
74 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
75 /* Representation of an 80-bit 'long double' as an initializer for a sequence
76 of 'unsigned int' words. */
77 # ifdef WORDS_BIGENDIAN
78 # define LDBL80_WORDS(exponent,manthi,mantlo) \
79 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
80 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
81 (unsigned int) (mantlo) << 16 \
84 # define LDBL80_WORDS(exponent,manthi,mantlo) \
85 { mantlo, manthi, exponent }
88 static memory_long_double x =
89 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
90 ASSERT (isnanl (x.value));
94 static memory_long_double x =
95 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
96 ASSERT (isnanl (x.value));
98 /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
99 Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
100 Intel IA-64 Architecture Software Developer's Manual, Volume 1:
101 Application Architecture.
102 Table 5-2 "Floating-Point Register Encodings"
103 Figure 5-6 "Memory to Floating-Point Register Data Translation"
106 static memory_long_double x =
107 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
108 ASSERT (isnanl (x.value));
110 { /* Pseudo-Infinity. */
111 static memory_long_double x =
112 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
113 ASSERT (isnanl (x.value));
116 static memory_long_double x =
117 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
118 ASSERT (isnanl (x.value));
120 { /* Unnormalized number. */
121 static memory_long_double x =
122 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
123 ASSERT (isnanl (x.value));
125 { /* Pseudo-Denormal. */
126 static memory_long_double x =
127 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
128 ASSERT (isnanl (x.value));