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b3918c44 | 1 | /* Test for the C++ implementation of iszero. |
dff8da6b | 2 | Copyright (C) 2016-2024 Free Software Foundation, Inc. |
b3918c44 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
b3918c44 FW |
18 | |
19 | #define _GNU_SOURCE 1 | |
20 | #include <math.h> | |
21 | #include <stdio.h> | |
22 | ||
23 | #include <limits> | |
24 | ||
42496114 GG |
25 | /* Support for _Float128 in std::numeric_limits is limited. |
26 | Include ieee754_float128.h and use the bitfields in the union | |
27 | ieee854_float128.ieee_nan to build corner-case inputs. */ | |
28 | #if __HAVE_DISTINCT_FLOAT128 | |
29 | # include <ieee754_float128.h> | |
30 | #endif | |
31 | ||
b3918c44 FW |
32 | static bool errors; |
33 | ||
34 | static void | |
35 | check (int actual, int expected, const char *actual_expr, int line) | |
36 | { | |
37 | if (actual != expected) | |
38 | { | |
39 | errors = true; | |
40 | printf ("%s:%d: error: %s\n", __FILE__, line, actual_expr); | |
41 | printf ("%s:%d: expected: %d\n", __FILE__, line, expected); | |
42 | printf ("%s:%d: actual: %d\n", __FILE__, line, actual); | |
43 | } | |
44 | } | |
45 | ||
46 | #define CHECK(actual, expected) \ | |
47 | check ((actual), (expected), #actual, __LINE__) | |
48 | ||
49 | template <class T> | |
50 | static void | |
51 | check_type () | |
52 | { | |
53 | typedef std::numeric_limits<T> limits; | |
54 | CHECK (iszero (T{}), 1); | |
55 | CHECK (iszero (T{0}), 1); | |
56 | CHECK (iszero (T{-0.0}), 1); | |
57 | CHECK (iszero (T{1}), 0); | |
58 | CHECK (iszero (T{-1}), 0); | |
59 | CHECK (iszero (limits::min ()), 0); | |
60 | CHECK (iszero (-limits::min ()), 0); | |
61 | CHECK (iszero (limits::max ()), 0); | |
62 | CHECK (iszero (-limits::max ()), 0); | |
63 | if (limits::has_infinity) | |
64 | { | |
65 | CHECK (iszero (limits::infinity ()), 0); | |
66 | CHECK (iszero (-limits::infinity ()), 0); | |
67 | } | |
68 | CHECK (iszero (limits::epsilon ()), 0); | |
69 | CHECK (iszero (-limits::epsilon ()), 0); | |
70 | if (limits::has_quiet_NaN) | |
71 | CHECK (iszero (limits::quiet_NaN ()), 0); | |
72 | if (limits::has_signaling_NaN) | |
73 | CHECK (iszero (limits::signaling_NaN ()), 0); | |
74 | if (limits::has_signaling_NaN) | |
75 | CHECK (iszero (limits::signaling_NaN ()), 0); | |
76 | CHECK (iszero (limits::denorm_min ()), | |
77 | std::numeric_limits<T>::has_denorm == std::denorm_absent); | |
78 | CHECK (iszero (-limits::denorm_min ()), | |
79 | std::numeric_limits<T>::has_denorm == std::denorm_absent); | |
80 | } | |
81 | ||
42496114 GG |
82 | #if __HAVE_DISTINCT_FLOAT128 |
83 | static void | |
84 | check_float128 () | |
85 | { | |
86 | ieee854_float128 q; | |
87 | ||
88 | q.d = 0.0Q; | |
89 | CHECK (iszero (q.d), 1); | |
90 | q.d = -0.0Q; | |
91 | CHECK (iszero (q.d), 1); | |
92 | q.d = 1.0Q; | |
93 | CHECK (iszero (q.d), 0); | |
94 | q.d = -1.0Q; | |
95 | CHECK (iszero (q.d), 0); | |
96 | ||
97 | /* Normal min. */ | |
98 | q.ieee.negative = 0; | |
99 | q.ieee.exponent = 0x0001; | |
100 | q.ieee.mantissa0 = 0x0000; | |
101 | q.ieee.mantissa1 = 0x00000000; | |
102 | q.ieee.mantissa2 = 0x00000000; | |
103 | q.ieee.mantissa3 = 0x00000000; | |
104 | CHECK (iszero (q.d), 0); | |
105 | q.ieee.negative = 1; | |
106 | CHECK (iszero (q.d), 0); | |
107 | ||
108 | /* Normal max. */ | |
109 | q.ieee.negative = 0; | |
110 | q.ieee.exponent = 0x7FFE; | |
111 | q.ieee.mantissa0 = 0xFFFF; | |
112 | q.ieee.mantissa1 = 0xFFFFFFFF; | |
113 | q.ieee.mantissa2 = 0xFFFFFFFF; | |
114 | q.ieee.mantissa3 = 0xFFFFFFFF; | |
115 | CHECK (iszero (q.d), 0); | |
116 | q.ieee.negative = 1; | |
117 | CHECK (iszero (q.d), 0); | |
118 | ||
119 | /* Infinity. */ | |
120 | q.ieee.negative = 0; | |
121 | q.ieee.exponent = 0x7FFF; | |
122 | q.ieee.mantissa0 = 0x0000; | |
123 | q.ieee.mantissa1 = 0x00000000; | |
124 | q.ieee.mantissa2 = 0x00000000; | |
125 | q.ieee.mantissa3 = 0x00000000; | |
126 | CHECK (iszero (q.d), 0); | |
127 | ||
128 | /* Quiet NaN. */ | |
129 | q.ieee_nan.quiet_nan = 1; | |
130 | q.ieee_nan.mantissa0 = 0x0000; | |
131 | CHECK (iszero (q.d), 0); | |
132 | ||
133 | /* Signaling NaN. */ | |
134 | q.ieee_nan.quiet_nan = 0; | |
135 | q.ieee_nan.mantissa0 = 0x4000; | |
136 | CHECK (iszero (q.d), 0); | |
137 | ||
138 | /* Denormal min. */ | |
139 | q.ieee.negative = 0; | |
140 | q.ieee.exponent = 0x0000; | |
141 | q.ieee.mantissa0 = 0x0000; | |
142 | q.ieee.mantissa1 = 0x00000000; | |
143 | q.ieee.mantissa2 = 0x00000000; | |
144 | q.ieee.mantissa3 = 0x00000001; | |
145 | CHECK (iszero (q.d), 0); | |
146 | q.ieee.negative = 1; | |
147 | CHECK (iszero (q.d), 0); | |
148 | } | |
149 | #endif | |
150 | ||
b3918c44 FW |
151 | static int |
152 | do_test (void) | |
153 | { | |
154 | check_type<float> (); | |
155 | check_type<double> (); | |
b3918c44 | 156 | check_type<long double> (); |
42496114 GG |
157 | #if __HAVE_DISTINCT_FLOAT128 |
158 | check_float128 (); | |
159 | #endif | |
b3918c44 FW |
160 | return errors; |
161 | } | |
162 | ||
163 | #define TEST_FUNCTION do_test () | |
164 | #include "../test-skeleton.c" |