1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164
|
/* Test for the C++ implementation of iszero.
Copyright (C) 2016-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define _GNU_SOURCE 1
#include <math.h>
#include <stdio.h>
#include <limits>
/* Support for _Float128 in std::numeric_limits is limited.
Include ieee754_float128.h and use the bitfields in the union
ieee854_float128.ieee_nan to build corner-case inputs. */
#if __HAVE_DISTINCT_FLOAT128
# include <ieee754_float128.h>
#endif
static bool errors;
static void
check (int actual, int expected, const char *actual_expr, int line)
{
if (actual != expected)
{
errors = true;
printf ("%s:%d: error: %s\n", __FILE__, line, actual_expr);
printf ("%s:%d: expected: %d\n", __FILE__, line, expected);
printf ("%s:%d: actual: %d\n", __FILE__, line, actual);
}
}
#define CHECK(actual, expected) \
check ((actual), (expected), #actual, __LINE__)
template <class T>
static void
check_type ()
{
typedef std::numeric_limits<T> limits;
CHECK (iszero (T{}), 1);
CHECK (iszero (T{0}), 1);
CHECK (iszero (T{-0.0}), 1);
CHECK (iszero (T{1}), 0);
CHECK (iszero (T{-1}), 0);
CHECK (iszero (limits::min ()), 0);
CHECK (iszero (-limits::min ()), 0);
CHECK (iszero (limits::max ()), 0);
CHECK (iszero (-limits::max ()), 0);
if (limits::has_infinity)
{
CHECK (iszero (limits::infinity ()), 0);
CHECK (iszero (-limits::infinity ()), 0);
}
CHECK (iszero (limits::epsilon ()), 0);
CHECK (iszero (-limits::epsilon ()), 0);
if (limits::has_quiet_NaN)
CHECK (iszero (limits::quiet_NaN ()), 0);
if (limits::has_signaling_NaN)
CHECK (iszero (limits::signaling_NaN ()), 0);
if (limits::has_signaling_NaN)
CHECK (iszero (limits::signaling_NaN ()), 0);
CHECK (iszero (limits::denorm_min ()),
std::numeric_limits<T>::has_denorm == std::denorm_absent);
CHECK (iszero (-limits::denorm_min ()),
std::numeric_limits<T>::has_denorm == std::denorm_absent);
}
#if __HAVE_DISTINCT_FLOAT128
static void
check_float128 ()
{
ieee854_float128 q;
q.d = 0.0Q;
CHECK (iszero (q.d), 1);
q.d = -0.0Q;
CHECK (iszero (q.d), 1);
q.d = 1.0Q;
CHECK (iszero (q.d), 0);
q.d = -1.0Q;
CHECK (iszero (q.d), 0);
/* Normal min. */
q.ieee.negative = 0;
q.ieee.exponent = 0x0001;
q.ieee.mantissa0 = 0x0000;
q.ieee.mantissa1 = 0x00000000;
q.ieee.mantissa2 = 0x00000000;
q.ieee.mantissa3 = 0x00000000;
CHECK (iszero (q.d), 0);
q.ieee.negative = 1;
CHECK (iszero (q.d), 0);
/* Normal max. */
q.ieee.negative = 0;
q.ieee.exponent = 0x7FFE;
q.ieee.mantissa0 = 0xFFFF;
q.ieee.mantissa1 = 0xFFFFFFFF;
q.ieee.mantissa2 = 0xFFFFFFFF;
q.ieee.mantissa3 = 0xFFFFFFFF;
CHECK (iszero (q.d), 0);
q.ieee.negative = 1;
CHECK (iszero (q.d), 0);
/* Infinity. */
q.ieee.negative = 0;
q.ieee.exponent = 0x7FFF;
q.ieee.mantissa0 = 0x0000;
q.ieee.mantissa1 = 0x00000000;
q.ieee.mantissa2 = 0x00000000;
q.ieee.mantissa3 = 0x00000000;
CHECK (iszero (q.d), 0);
/* Quiet NaN. */
q.ieee_nan.quiet_nan = 1;
q.ieee_nan.mantissa0 = 0x0000;
CHECK (iszero (q.d), 0);
/* Signaling NaN. */
q.ieee_nan.quiet_nan = 0;
q.ieee_nan.mantissa0 = 0x4000;
CHECK (iszero (q.d), 0);
/* Denormal min. */
q.ieee.negative = 0;
q.ieee.exponent = 0x0000;
q.ieee.mantissa0 = 0x0000;
q.ieee.mantissa1 = 0x00000000;
q.ieee.mantissa2 = 0x00000000;
q.ieee.mantissa3 = 0x00000001;
CHECK (iszero (q.d), 0);
q.ieee.negative = 1;
CHECK (iszero (q.d), 0);
}
#endif
static int
do_test (void)
{
check_type<float> ();
check_type<double> ();
check_type<long double> ();
#if __HAVE_DISTINCT_FLOAT128
check_float128 ();
#endif
return errors;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
|