1 | /* Test for the C++ implementation of iszero. |
2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
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 |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #define _GNU_SOURCE 1 |
20 | #include <math.h> |
21 | #include <stdio.h> |
22 | |
23 | #include <limits> |
24 | |
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 | |
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 (format: "%s:%d: error: %s\n" , __FILE__, line, actual_expr); |
41 | printf (format: "%s:%d: expected: %d\n" , __FILE__, line, expected); |
42 | printf (format: "%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 | |
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 | |
151 | static int |
152 | do_test (void) |
153 | { |
154 | check_type<float> (); |
155 | check_type<double> (); |
156 | check_type<long double> (); |
157 | #if __HAVE_DISTINCT_FLOAT128 |
158 | check_float128 (); |
159 | #endif |
160 | return errors; |
161 | } |
162 | |
163 | #define TEST_FUNCTION do_test () |
164 | #include "../test-skeleton.c" |
165 | |