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 2, or (at your option)
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, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
25 #define ASSERT(expr) \
30 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
40 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
41 typedef union { unsigned int word[NWORDS]; long double value; }
45 ASSERT (!isnanl (3.141L));
46 ASSERT (!isnanl (3.141e30L));
47 ASSERT (!isnanl (3.141e-30L));
48 ASSERT (!isnanl (-2.718L));
49 ASSERT (!isnanl (-2.718e30L));
50 ASSERT (!isnanl (-2.718e-30L));
51 /* Infinite values. */
52 ASSERT (!isnanl (1.0L / 0.0L));
53 ASSERT (!isnanl (-1.0L / 0.0L));
55 ASSERT (isnanl (0.0L / 0.0L));
57 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
58 /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
59 it's a Signalling NaN. */
62 m.value = 0.0L / 0.0L;
63 # if LDBL_EXPBIT0_BIT > 0
64 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
66 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
67 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
69 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
70 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
71 ASSERT (isnanl (m.value));
75 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
76 /* Representation of an 80-bit 'long double' as an initializer for a sequence
77 of 'unsigned int' words. */
78 # ifdef WORDS_BIGENDIAN
79 # define LDBL80_WORDS(exponent,manthi,mantlo) \
80 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
81 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
82 (unsigned int) (mantlo) << 16 \
85 # define LDBL80_WORDS(exponent,manthi,mantlo) \
86 { mantlo, manthi, exponent }
89 static memory_long_double x =
90 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
91 ASSERT (isnanl (x.value));
95 static memory_long_double x =
96 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
97 ASSERT (isnanl (x.value));
99 /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
100 Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
101 Intel IA-64 Architecture Software Developer's Manual, Volume 1:
102 Application Architecture.
103 Table 5-2 "Floating-Point Register Encodings"
104 Figure 5-6 "Memory to Floating-Point Register Data Translation"
107 static memory_long_double x =
108 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
109 ASSERT (isnanl (x.value));
111 { /* Pseudo-Infinity. */
112 static memory_long_double x =
113 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
114 ASSERT (isnanl (x.value));
117 static memory_long_double x =
118 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
119 ASSERT (isnanl (x.value));
121 { /* Unnormalized number. */
122 static memory_long_double x =
123 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
124 ASSERT (isnanl (x.value));
126 { /* Pseudo-Denormal. */
127 static memory_long_double x =
128 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
129 ASSERT (isnanl (x.value));