1 /* Test of isfinite() 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, 2007, using Bruno Haible's code as a
24 /* isfinite must be a macro. */
26 # error missing declaration
34 #define ASSERT(expr) \
39 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
48 long double zerol = 0.0L;
54 ASSERT (isfinite (0.0f));
55 /* Subnormal values. */
56 ASSERT (isfinite (FLT_MIN / 2));
57 ASSERT (isfinite (-FLT_MIN / 2));
59 ASSERT (isfinite (3.141f));
60 ASSERT (isfinite (3.141e30f));
61 ASSERT (isfinite (3.141e-30f));
62 ASSERT (isfinite (-2.718f));
63 ASSERT (isfinite (-2.718e30f));
64 ASSERT (isfinite (-2.718e-30f));
65 /* Infinite values. */
66 ASSERT (!isfinite (1.0f / 0.0f));
67 ASSERT (!isfinite (-1.0f / 0.0f));
69 ASSERT (!isfinite (zerof / zerof));
70 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
74 ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
75 typedef union { float value; unsigned int word[NWORDS]; } memory_float;
77 m.value = zerof / zerof;
78 # if FLT_EXPBIT0_BIT > 0
79 m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
81 m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
82 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
84 if (FLT_EXPBIT0_WORD < NWORDS / 2)
85 m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
87 m.word[0] |= (unsigned int) 1;
88 ASSERT (!isfinite (m.value));
98 ASSERT (isfinite (0.0));
99 /* Subnormal values. */
100 ASSERT (isfinite (DBL_MIN / 2));
101 ASSERT (isfinite (-DBL_MIN / 2));
103 ASSERT (isfinite (3.141));
104 ASSERT (isfinite (3.141e30));
105 ASSERT (isfinite (3.141e-30));
106 ASSERT (isfinite (-2.718));
107 ASSERT (isfinite (-2.718e30));
108 ASSERT (isfinite (-2.718e-30));
109 /* Infinite values. */
110 ASSERT (!isfinite (1.0 / 0.0));
111 ASSERT (!isfinite (-1.0 / 0.0));
113 ASSERT (!isfinite (zerod / zerod));
114 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
115 /* Signalling NaN. */
118 ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
119 typedef union { double value; unsigned int word[NWORDS]; } memory_double;
121 m.value = zerod / zerod;
122 # if DBL_EXPBIT0_BIT > 0
123 m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
125 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
126 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
128 m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
129 |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
130 ASSERT (!isfinite (m.value));
140 ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
141 typedef union { unsigned int word[NWORDS]; long double value; }
145 ASSERT (isfinite (0.0L));
146 /* Subnormal values. */
147 ASSERT (isfinite (LDBL_MIN / 2));
148 ASSERT (isfinite (-LDBL_MIN / 2));
150 ASSERT (isfinite (3.141L));
151 ASSERT (isfinite (3.141e30L));
152 ASSERT (isfinite (3.141e-30L));
153 ASSERT (isfinite (-2.718L));
154 ASSERT (isfinite (-2.718e30L));
155 ASSERT (isfinite (-2.718e-30L));
156 /* Infinite values. */
157 ASSERT (!isfinite (1.0L / 0.0L));
158 ASSERT (!isfinite (-1.0L / 0.0L));
160 ASSERT (!isfinite (zerol / zerol));
162 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
163 /* A bit pattern that is different from a Quiet NaN. With a bit of luck,
164 it's a Signalling NaN. */
166 memory_long_double m;
167 m.value = zerol / zerol;
168 # if LDBL_EXPBIT0_BIT > 0
169 m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
171 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
172 ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
174 m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDS / 2 ? 1 : - 1)]
175 |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
176 ASSERT (!isfinite (m.value));
180 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
181 /* Representation of an 80-bit 'long double' as an initializer for a sequence
182 of 'unsigned int' words. */
183 # ifdef WORDS_BIGENDIAN
184 # define LDBL80_WORDS(exponent,manthi,mantlo) \
185 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
186 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
187 (unsigned int) (mantlo) << 16 \
190 # define LDBL80_WORDS(exponent,manthi,mantlo) \
191 { mantlo, manthi, exponent }
194 static memory_long_double x =
195 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
196 ASSERT (!isfinite (x.value));
199 /* Signalling NaN. */
200 static memory_long_double x =
201 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
202 ASSERT (!isfinite (x.value));
204 /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
205 Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
206 Intel IA-64 Architecture Software Developer's Manual, Volume 1:
207 Application Architecture.
208 Table 5-2 "Floating-Point Register Encodings"
209 Figure 5-6 "Memory to Floating-Point Register Data Translation"
212 static memory_long_double x =
213 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
214 ASSERT (!isfinite (x.value));
216 { /* Pseudo-Infinity. */
217 static memory_long_double x =
218 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
219 ASSERT (!isfinite (x.value));
222 static memory_long_double x =
223 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
224 ASSERT (!isfinite (x.value));
226 { /* Unnormalized number. */
227 static memory_long_double x =
228 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
229 ASSERT (!isfinite (x.value));
231 { /* Pseudo-Denormal. */
232 static memory_long_double x =
233 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
234 ASSERT (!isfinite (x.value));