1 /* Test of isnand() substitute.
2 Copyright (C) 2007-2009 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 Ben Pfaff <blp@cs.stanford.edu>, from code by Bruno
18 Haible <bruno@clisp.org>. */
24 /* isnan must be a macro. */
26 # error missing declaration
36 #define ASSERT(expr) \
41 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
48 /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0f.
49 So we use -zero instead. */
52 /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
53 So we use -zero instead. */
56 /* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
57 So we use minus_zerol instead.
58 IRIX cc can't put -0.0L into .data, but can compute at runtime.
59 Note that the expression -LDBL_MIN * LDBL_MIN does not work on other
60 platforms, such as when cross-compiling to PowerPC on MacOS X 10.5. */
61 #if defined __hpux || defined __sgi
63 compute_minus_zerol (void)
65 return -LDBL_MIN * LDBL_MIN;
67 # define minus_zerol compute_minus_zerol ()
69 long double minus_zerol = -0.0L;
76 ASSERT (!isnan (3.141f));
77 ASSERT (!isnan (3.141e30f));
78 ASSERT (!isnan (3.141e-30f));
79 ASSERT (!isnan (-2.718f));
80 ASSERT (!isnan (-2.718e30f));
81 ASSERT (!isnan (-2.718e-30f));
82 ASSERT (!isnan (0.0f));
83 ASSERT (!isnan (-zerof));
84 /* Infinite values. */
85 ASSERT (!isnan (1.0f / 0.0f));
86 ASSERT (!isnan (-1.0f / 0.0f));
88 ASSERT (isnan (NaNf ()));
89 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
93 ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
94 typedef union { float value; unsigned int word[NWORDSF]; } memory_float;
97 # if FLT_EXPBIT0_BIT > 0
98 m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
100 m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDSF / 2 ? 1 : - 1)]
101 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
103 if (FLT_EXPBIT0_WORD < NWORDSF / 2)
104 m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
106 m.word[0] |= (unsigned int) 1;
107 ASSERT (isnan (m.value));
116 ASSERT (!isnan (3.141));
117 ASSERT (!isnan (3.141e30));
118 ASSERT (!isnan (3.141e-30));
119 ASSERT (!isnan (-2.718));
120 ASSERT (!isnan (-2.718e30));
121 ASSERT (!isnan (-2.718e-30));
122 ASSERT (!isnan (0.0));
123 ASSERT (!isnan (-zerod));
124 /* Infinite values. */
125 ASSERT (!isnan (1.0 / 0.0));
126 ASSERT (!isnan (-1.0 / 0.0));
128 ASSERT (isnan (NaNd ()));
129 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
130 /* Signalling NaN. */
133 ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
134 typedef union { double value; unsigned int word[NWORDSD]; } memory_double;
137 # if DBL_EXPBIT0_BIT > 0
138 m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
140 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDSD / 2 ? 1 : - 1)]
141 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
143 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDSD / 2 ? 1 : - 1)]
144 |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
145 ASSERT (isnan (m.value));
151 test_long_double (void)
154 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
155 typedef union { unsigned int word[NWORDSL]; long double value; }
159 ASSERT (!isnan (3.141L));
160 ASSERT (!isnan (3.141e30L));
161 ASSERT (!isnan (3.141e-30L));
162 ASSERT (!isnan (-2.718L));
163 ASSERT (!isnan (-2.718e30L));
164 ASSERT (!isnan (-2.718e-30L));
165 ASSERT (!isnan (0.0L));
166 ASSERT (!isnan (minus_zerol));
167 /* Infinite values. */
168 ASSERT (!isnan (1.0L / 0.0L));
169 ASSERT (!isnan (-1.0L / 0.0L));
171 ASSERT (isnan (NaNl ()));
173 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
174 /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
175 it's a Signalling NaN. */
177 memory_long_double m;
179 # if LDBL_EXPBIT0_BIT > 0
180 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
182 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDSL / 2 ? 1 : - 1)]
183 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
185 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDSL / 2 ? 1 : - 1)]
186 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
187 ASSERT (isnan (m.value));
191 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
192 /* Representation of an 80-bit 'long double' as an initializer for a sequence
193 of 'unsigned int' words. */
194 # ifdef WORDS_BIGENDIAN
195 # define LDBL80_WORDS(exponent,manthi,mantlo) \
196 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
197 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
198 (unsigned int) (mantlo) << 16 \
201 # define LDBL80_WORDS(exponent,manthi,mantlo) \
202 { mantlo, manthi, exponent }
205 static memory_long_double x =
206 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
207 ASSERT (isnan (x.value));
210 /* Signalling NaN. */
211 static memory_long_double x =
212 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
213 ASSERT (isnan (x.value));
215 /* The isnan function should recognize Pseudo-NaNs, Pseudo-Infinities,
216 Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
217 Intel IA-64 Architecture Software Developer's Manual, Volume 1:
218 Application Architecture.
219 Table 5-2 "Floating-Point Register Encodings"
220 Figure 5-6 "Memory to Floating-Point Register Data Translation"
223 static memory_long_double x =
224 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
225 ASSERT (isnan (x.value));
227 { /* Pseudo-Infinity. */
228 static memory_long_double x =
229 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
230 ASSERT (isnan (x.value));
233 static memory_long_double x =
234 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
235 ASSERT (isnan (x.value));
237 { /* Unnormalized number. */
238 static memory_long_double x =
239 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
240 ASSERT (isnan (x.value));
242 { /* Pseudo-Denormal. */
243 static memory_long_double x =
244 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
245 ASSERT (isnan (x.value));