1 /* Copyright (C) 1999-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library 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 GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <math.h>
19 #include <float.h>
20 #include <stdio.h>
21
22 #include <math-tests.h>
23
24
25 static int errors = 0;
26
27
28 static void
29 check (const char *testname, int result)
30 {
31 if (!result) {
32 printf ("Failure: %s\n", testname);
33 errors++;
34 }
35 }
36
37 #define TEST_FUNC(NAME, FLOAT, SUFFIX, EPSILON, HUGEVAL) \
38 static void \
39 NAME (void) \
40 { \
41 /* Variables are declared volatile to forbid some compiler \
42 optimizations. */ \
43 volatile FLOAT Inf_var, qNaN_var, zero_var, one_var; \
44 /* A sNaN is only guaranteed to be representable in variables with */ \
45 /* static (or thread-local) storage duration. */ \
46 static volatile FLOAT sNaN_var = __builtin_nans ## SUFFIX (""); \
47 static volatile FLOAT minus_sNaN_var = -__builtin_nans ## SUFFIX (""); \
48 FLOAT x1, x2; \
49 \
50 zero_var = 0.0; \
51 one_var = 1.0; \
52 qNaN_var = __builtin_nan ## SUFFIX (""); \
53 Inf_var = one_var / zero_var; \
54 \
55 (void) &zero_var; \
56 (void) &one_var; \
57 (void) &qNaN_var; \
58 (void) &sNaN_var; \
59 (void) &minus_sNaN_var; \
60 (void) &Inf_var; \
61 \
62 \
63 check (#FLOAT " isinf (inf) == 1", isinf (Inf_var) == 1); \
64 check (#FLOAT " isinf (-inf) == -1", isinf (-Inf_var) == -1); \
65 check (#FLOAT " !isinf (1)", !(isinf (one_var))); \
66 check (#FLOAT " !isinf (qNaN)", !(isinf (qNaN_var))); \
67 if (SNAN_TESTS (FLOAT)) \
68 check (#FLOAT " !isinf (sNaN)", !(isinf (sNaN_var))); \
69 \
70 check (#FLOAT " isnan (qNaN)", isnan (qNaN_var)); \
71 if (SNAN_TESTS (FLOAT)) \
72 check (#FLOAT " isnan (sNaN)", isnan (sNaN_var)); \
73 check (#FLOAT " isnan (-qNaN)", isnan (-qNaN_var)); \
74 if (SNAN_TESTS (FLOAT)) \
75 check (#FLOAT " isnan (-sNaN)", isnan (minus_sNaN_var)); \
76 check (#FLOAT " !isnan (1)", !(isnan (one_var))); \
77 check (#FLOAT " !isnan (inf)", !(isnan (Inf_var))); \
78 \
79 check (#FLOAT " !issignaling (qNaN)", !(issignaling (qNaN_var))); \
80 if (SNAN_TESTS (FLOAT)) \
81 check (#FLOAT " issignaling (sNaN)", issignaling (sNaN_var)); \
82 check (#FLOAT " !issignaling (-qNaN)", !(issignaling (-qNaN_var))); \
83 if (SNAN_TESTS (FLOAT)) \
84 check (#FLOAT " issignaling (-sNaN)", issignaling (minus_sNaN_var)); \
85 check (#FLOAT " !issignaling (1)", !(issignaling (one_var))); \
86 check (#FLOAT " !issignaling (inf)", !(issignaling (Inf_var))); \
87 \
88 check (#FLOAT " inf == inf", Inf_var == Inf_var); \
89 check (#FLOAT " -inf == -inf", -Inf_var == -Inf_var); \
90 check (#FLOAT " inf != -inf", Inf_var != -Inf_var); \
91 check (#FLOAT " qNaN != qNaN", qNaN_var != qNaN_var); \
92 if (SNAN_TESTS (FLOAT)) \
93 check (#FLOAT " sNaN != sNaN", sNaN_var != sNaN_var); \
94 if (SNAN_TESTS (FLOAT)) \
95 check (#FLOAT " qNaN != sNaN", qNaN_var != sNaN_var); \
96 if (SNAN_TESTS (FLOAT)) \
97 check (#FLOAT " -sNaN != -sNaN", minus_sNaN_var != minus_sNaN_var); \
98 if (SNAN_TESTS (FLOAT)) \
99 check (#FLOAT " sNaN != -sNaN", sNaN_var != minus_sNaN_var); \
100 if (SNAN_TESTS (FLOAT)) \
101 check (#FLOAT " qNaN != -sNaN", qNaN_var != minus_sNaN_var); \
102 \
103 /* \
104 the same tests but this time with NAN from <bits/nan.h> \
105 NAN is a double const \
106 */ \
107 check (#FLOAT " isnan (NAN)", isnan (NAN)); \
108 check (#FLOAT " isnan (-NAN)", isnan (-NAN)); \
109 check (#FLOAT " !isinf (NAN)", !(isinf (NAN))); \
110 check (#FLOAT " !isinf (-NAN)", !(isinf (-NAN))); \
111 check (#FLOAT " NAN != NAN", NAN != NAN); \
112 check (#FLOAT " NAN != qNaN", NAN != qNaN_var); \
113 if (SNAN_TESTS (FLOAT)) \
114 check (#FLOAT " NAN != sNaN", NAN != sNaN_var); \
115 if (SNAN_TESTS (FLOAT)) \
116 check (#FLOAT " NAN != -sNaN", NAN != minus_sNaN_var); \
117 \
118 /* \
119 And again with the value returned by the `nan' function. \
120 */ \
121 check (#FLOAT " isnan (nan (\"\"))", isnan (nan ## SUFFIX (""))); \
122 check (#FLOAT " isnan (-nan (\"\"))", isnan (-nan ## SUFFIX (""))); \
123 check (#FLOAT " !isinf (nan (\"\"))", !(isinf (nan ## SUFFIX ("")))); \
124 check (#FLOAT " !isinf (-nan (\"\"))", !(isinf (-nan ## SUFFIX ("")))); \
125 check (#FLOAT " nan (\"\") != nan (\"\")", \
126 nan ## SUFFIX ("") != nan ## SUFFIX ("")); \
127 check (#FLOAT " nan (\"\") != qNaN", nan ## SUFFIX ("") != qNaN_var); \
128 if (SNAN_TESTS (FLOAT)) \
129 check (#FLOAT " nan (\"\") != sNaN", nan ## SUFFIX ("") != sNaN_var); \
130 if (SNAN_TESTS (FLOAT)) \
131 check (#FLOAT " nan (\"\") != -sNaN", \
132 nan ## SUFFIX ("") != minus_sNaN_var); \
133 \
134 /* test if EPSILON is ok */ \
135 x1 = 1.0; \
136 x2 = x1 + EPSILON; \
137 check (#FLOAT " 1 != 1+EPSILON", x1 != x2); \
138 \
139 x1 = 1.0; \
140 x2 = x1 - EPSILON; \
141 check (#FLOAT " 1 != 1-EPSILON", x1 != x2); \
142 \
143 /* test if HUGE_VALx is ok */ \
144 x1 = HUGEVAL; \
145 check (#FLOAT " isinf (HUGE_VALx) == +1", isinf (x1) == +1); \
146 x1 = - HUGEVAL; \
147 check (#FLOAT " isinf (-HUGE_VALx) == -1", isinf (x1) == -1); \
148 }
149
150 #define TEST_CONVERT(NAME, FLOAT, DOUBLE, SUFFIX) \
151 void \
152 NAME (void) \
153 { \
154 volatile DOUBLE Inf_var, qNaN_var, zero_var, one_var; \
155 /* A sNaN is only guaranteed to be representable in variables with */ \
156 /* static (or thread-local) storage duration. */ \
157 static volatile DOUBLE sNaN_var = __builtin_nans ## SUFFIX (""); \
158 FLOAT x1, x2; \
159 \
160 zero_var = 0.0; \
161 one_var = 1.0; \
162 qNaN_var = __builtin_nan ## SUFFIX (""); \
163 Inf_var = one_var / zero_var; \
164 \
165 (void) &qNaN_var; \
166 (void) &sNaN_var; \
167 (void) &Inf_var; \
168 \
169 x1 = (FLOAT) qNaN_var; \
170 check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") qNaN, isnan", isnan (x1)); \
171 check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") qNaN, !issignaling", \
172 !issignaling (x1)); \
173 if (SNAN_TESTS (FLOAT)) \
174 { \
175 x1 = (FLOAT) sNaN_var; \
176 check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") sNaN, isnan", isnan (x1)); \
177 if (SNAN_TESTS_TYPE_CAST) \
178 { \
179 /* Upon type conversion, a sNaN is converted into a qNaN plus an */ \
180 /* INVALID exception (not checked here). */ \
181 check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") sNaN, !issignaling", \
182 !issignaling (x1)); \
183 } \
184 } \
185 x2 = (FLOAT) Inf_var; \
186 check (" "#FLOAT" x = ("#FLOAT") ("#DOUBLE") Inf", isinf (x2) != 0); \
187 }
188
189 TEST_FUNC (float_test, float, f, FLT_EPSILON, HUGE_VALF)
190 TEST_FUNC (double_test, double, , DBL_EPSILON, HUGE_VAL)
191 TEST_CONVERT (convert_dfsf_test, float, double, )
192 TEST_CONVERT (convert_sfdf_test, double, float, f)
193 #if LDBL_MANT_DIG > DBL_MANT_DIG
194 TEST_FUNC (ldouble_test, long double, l, LDBL_EPSILON, HUGE_VALL)
195 TEST_CONVERT (convert_tfsf_test, float, long double, l)
196 TEST_CONVERT (convert_sftf_test, long double, float, f)
197 TEST_CONVERT (convert_tfdf_test, double, long double, l)
198 TEST_CONVERT (convert_dftf_test, long double, double, )
199 #endif
200
201 int
202 do_test (void)
203 {
204 float_test ();
205 double_test ();
206 convert_dfsf_test();
207 convert_sfdf_test();
208
209 #if LDBL_MANT_DIG > DBL_MANT_DIG
210 ldouble_test ();
211 convert_tfsf_test();
212 convert_sftf_test();
213 convert_tfdf_test();
214 convert_dftf_test();
215 #endif
216
217 return errors != 0;
218 }
219
220 #define TEST_FUNCTION do_test ()
221 #include "../test-skeleton.c"