math/test-math-issignaling.cc

   1 /* Test for the C++ implementation of issignaling.
   2    Copyright (C) 2017-2023 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 /* There is no signaling_NaN for _Float128 in std::numeric_limits.
  26    Include ieee754_float128.h and use the bitfields in the union
  27    ieee854_float128.ieee_nan to build a signaling NaN.  */
  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 ("%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 (issignaling (T{0}), 0);
  55   if (limits::has_infinity)
  56     {
  57       CHECK (issignaling (limits::infinity ()), 0);
  58       CHECK (issignaling (-limits::infinity ()), 0);
  59     }
  60   if (limits::has_quiet_NaN)
  61     CHECK (issignaling (limits::quiet_NaN ()), 0);
  62   if (limits::has_signaling_NaN)
  63     CHECK (issignaling (limits::signaling_NaN ()), 1);
  64 }
  65
  66 #if __HAVE_DISTINCT_FLOAT128
  67 static void
  68 check_float128 ()
  69 {
  70   ieee854_float128 q;
  71
  72   q.d = 0;
  73   CHECK (issignaling (q.d), 0);
  74
  75   /* Infinity.  */
  76   q.ieee.negative = 0;
  77   q.ieee.exponent = 0x7FFF;
  78   q.ieee.mantissa0 = 0x0000;
  79   q.ieee.mantissa1 = 0x00000000;
  80   q.ieee.mantissa2 = 0x00000000;
  81   q.ieee.mantissa3 = 0x00000000;
  82   CHECK (issignaling (q.d), 0);
  83
  84   /* Quiet NaN.  */
  85   q.ieee_nan.quiet_nan = 1;
  86   q.ieee_nan.mantissa0 = 0x0000;
  87   CHECK (issignaling (q.d), 0);
  88
  89   /* Still a quiet NaN.  */
  90   q.ieee_nan.quiet_nan = 1;
  91   q.ieee_nan.mantissa0 = 0x4000;
  92   CHECK (issignaling (q.d), 0);
  93
  94   /* Signaling NaN.  */
  95   q.ieee_nan.quiet_nan = 0;
  96   q.ieee_nan.mantissa0 = 0x4000;
  97   CHECK (issignaling (q.d), 1);
  98 }
  99 #endif
 100
 101 static int
 102 do_test (void)
 103 {
 104   check_type<float> ();
 105   check_type<double> ();
 106   check_type<long double> ();
 107 #if __HAVE_DISTINCT_FLOAT128
 108   check_float128 ();
 109 #endif
 110   return errors;
 111 }
 112
 113 #include <support/test-driver.c>