math/test-iszero-excess-precision.c

   1 /* Test iszero with excess precision.
   2    Copyright (C) 2016-2023 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 #include <float.h>
  20 #include <math.h>
  21 #include <stdio.h>
  22
  23 #define TEST(TYPE, TRUE_MIN)                                            \
  24   do                                                                    \
  25     {                                                                   \
  26       if (iszero (TRUE_MIN / 2))                                        \
  27         puts ("iszero removes excess precision for " #TYPE);            \
  28       else                                                              \
  29         {                                                               \
  30           puts ("iszero fails to remove excess precision for " #TYPE);  \
  31           result = 1;                                                   \
  32         }                                                               \
  33     }                                                                   \
  34   while (0)
  35
  36 static int
  37 do_test (void)
  38 {
  39   int result = 0;
  40
  41   TEST (float, FLT_TRUE_MIN);
  42   TEST (double, DBL_TRUE_MIN);
  43   TEST (long double, LDBL_TRUE_MIN);
  44
  45   return result;
  46 }
  47
  48 #define TEST_FUNCTION do_test ()
  49 #include "../test-skeleton.c"