1 /* Test of isnand() substitute.
2    Copyright (C) 2007-2021 Free Software Foundation, Inc.
3 
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.
8 
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.
13 
14    You should have received a copy of the GNU General Public License
15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
16 
17 /* Written by Ben Pfaff <blp@cs.stanford.edu>, from code by Bruno
18    Haible <bruno@clisp.org>.  */
19 
20 #include <config.h>
21 
22 #include <math.h>
23 
24 /* isnan must be a macro.  */
25 #ifndef isnan
26 # error missing declaration
27 #endif
28 
29 #include <float.h>
30 #include <limits.h>
31 
32 #include "minus-zero.h"
33 #include "infinity.h"
34 #include "nan.h"
35 #include "macros.h"
36 
37 static void
test_float(void)38 test_float (void)
39 {
40   /* Finite values.  */
41   ASSERT (!isnan (3.141f));
42   ASSERT (!isnan (3.141e30f));
43   ASSERT (!isnan (3.141e-30f));
44   ASSERT (!isnan (-2.718f));
45   ASSERT (!isnan (-2.718e30f));
46   ASSERT (!isnan (-2.718e-30f));
47   ASSERT (!isnan (0.0f));
48   ASSERT (!isnan (minus_zerof));
49   /* Infinite values.  */
50   ASSERT (!isnan (Infinityf ()));
51   ASSERT (!isnan (- Infinityf ()));
52   /* Quiet NaN.  */
53   ASSERT (isnan (NaNf ()));
54 #if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT
55   /* Signalling NaN.  */
56   {
57     #define NWORDSF \
58       ((sizeof (float) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
59     typedef union { float value; unsigned int word[NWORDSF]; } memory_float;
60     memory_float m;
61     m.value = NaNf ();
62 # if FLT_EXPBIT0_BIT > 0
63     m.word[FLT_EXPBIT0_WORD] ^= (unsigned int) 1 << (FLT_EXPBIT0_BIT - 1);
64 # else
65     m.word[FLT_EXPBIT0_WORD + (FLT_EXPBIT0_WORD < NWORDSF / 2 ? 1 : - 1)]
66       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
67 # endif
68     if (FLT_EXPBIT0_WORD < NWORDSF / 2)
69       m.word[FLT_EXPBIT0_WORD + 1] |= (unsigned int) 1 << FLT_EXPBIT0_BIT;
70     else
71       m.word[0] |= (unsigned int) 1;
72     ASSERT (isnan (m.value));
73   }
74 #endif
75 }
76 
77 static void
test_double(void)78 test_double (void)
79 {
80   /* Finite values.  */
81   ASSERT (!isnan (3.141));
82   ASSERT (!isnan (3.141e30));
83   ASSERT (!isnan (3.141e-30));
84   ASSERT (!isnan (-2.718));
85   ASSERT (!isnan (-2.718e30));
86   ASSERT (!isnan (-2.718e-30));
87   ASSERT (!isnan (0.0));
88   ASSERT (!isnan (minus_zerod));
89   /* Infinite values.  */
90   ASSERT (!isnan (Infinityd ()));
91   ASSERT (!isnan (- Infinityd ()));
92   /* Quiet NaN.  */
93   ASSERT (isnan (NaNd ()));
94 #if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT
95   /* Signalling NaN.  */
96   {
97     #define NWORDSD \
98       ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
99     typedef union { double value; unsigned int word[NWORDSD]; } memory_double;
100     memory_double m;
101     m.value = NaNd ();
102 # if DBL_EXPBIT0_BIT > 0
103     m.word[DBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (DBL_EXPBIT0_BIT - 1);
104 # else
105     m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDSD / 2 ? 1 : - 1)]
106       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
107 # endif
108     m.word[DBL_EXPBIT0_WORD + (DBL_EXPBIT0_WORD < NWORDSD / 2 ? 1 : - 1)]
109       |= (unsigned int) 1 << DBL_EXPBIT0_BIT;
110     ASSERT (isnan (m.value));
111   }
112 #endif
113 }
114 
115 static void
test_long_double(void)116 test_long_double (void)
117 {
118   #define NWORDSL \
119     ((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
120   typedef union { unsigned int word[NWORDSL]; long double value; }
121           memory_long_double;
122 
123   /* Finite values.  */
124   ASSERT (!isnan (3.141L));
125   ASSERT (!isnan (3.141e30L));
126   ASSERT (!isnan (3.141e-30L));
127   ASSERT (!isnan (-2.718L));
128   ASSERT (!isnan (-2.718e30L));
129   ASSERT (!isnan (-2.718e-30L));
130   ASSERT (!isnan (0.0L));
131   ASSERT (!isnan (minus_zerol));
132   /* Infinite values.  */
133   ASSERT (!isnan (Infinityl ()));
134   ASSERT (!isnan (- Infinityl ()));
135   /* Quiet NaN.  */
136   ASSERT (isnan (NaNl ()));
137 
138 #if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT
139   /* A bit pattern that is different from a Quiet NaN.  With a bit of luck,
140      it's a Signalling NaN.  */
141   {
142 #if defined __powerpc__ && LDBL_MANT_DIG == 106
143     /* This is PowerPC "double double", a pair of two doubles.  Inf and Nan are
144        represented as the corresponding 64-bit IEEE values in the first double;
145        the second is ignored.  Manipulate only the first double.  */
146     #undef NWORDSL
147     #define NWORDSL \
148       ((sizeof (double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
149 #endif
150 
151     memory_long_double m;
152     m.value = NaNl ();
153 # if LDBL_EXPBIT0_BIT > 0
154     m.word[LDBL_EXPBIT0_WORD] ^= (unsigned int) 1 << (LDBL_EXPBIT0_BIT - 1);
155 # else
156     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDSL / 2 ? 1 : - 1)]
157       ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
158 # endif
159     m.word[LDBL_EXPBIT0_WORD + (LDBL_EXPBIT0_WORD < NWORDSL / 2 ? 1 : - 1)]
160       |= (unsigned int) 1 << LDBL_EXPBIT0_BIT;
161     ASSERT (isnan (m.value));
162   }
163 #endif
164 
165 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
166 /* Representation of an 80-bit 'long double' as an initializer for a sequence
167    of 'unsigned int' words.  */
168 # ifdef WORDS_BIGENDIAN
169 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
170      { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
171        ((unsigned int) (manthi) << 16) | ((unsigned int) (mantlo) >> 16),   \
172        (unsigned int) (mantlo) << 16                                        \
173      }
174 # else
175 #  define LDBL80_WORDS(exponent,manthi,mantlo) \
176      { mantlo, manthi, exponent }
177 # endif
178   { /* Quiet NaN.  */
179     static memory_long_double x =
180       { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
181     ASSERT (isnan (x.value));
182   }
183   {
184     /* Signalling NaN.  */
185     static memory_long_double x =
186       { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
187     ASSERT (isnan (x.value));
188   }
189   /* isnan should return something for noncanonical values.  */
190   { /* Pseudo-NaN.  */
191     static memory_long_double x =
192       { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
193     ASSERT (isnan (x.value) || !isnan (x.value));
194   }
195   { /* Pseudo-Infinity.  */
196     static memory_long_double x =
197       { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
198     ASSERT (isnan (x.value) || !isnan (x.value));
199   }
200   { /* Pseudo-Zero.  */
201     static memory_long_double x =
202       { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
203     ASSERT (isnan (x.value) || !isnan (x.value));
204   }
205   { /* Unnormalized number.  */
206     static memory_long_double x =
207       { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
208     ASSERT (isnan (x.value) || !isnan (x.value));
209   }
210   { /* Pseudo-Denormal.  */
211     static memory_long_double x =
212       { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
213     ASSERT (isnan (x.value) || !isnan (x.value));
214   }
215 #endif
216 }
217 
218 int
main()219 main ()
220 {
221   test_float ();
222   test_double ();
223   test_long_double ();
224   return 0;
225 }
226