tests/test-rint.h

   1 /* Test of rint*() function family.
   2    Copyright (C) 2012-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 static void
  18 test_function (void)
  19 {
  20   /* Infinite numbers.  */
  21   ASSERT (RINT (INFINITY) == INFINITY);
  22   ASSERT (RINT (- INFINITY) == - INFINITY);
  23   /* NaNs.  */
  24   ASSERT (ISNAN (RINT (NAN)));
  25
  26   /* Randomized tests.  */
  27   {
  28     int i;
  29
  30     for (i = 0; i < SIZEOF (RANDOM); i++)
  31       {
  32         DOUBLE x;
  33
  34         x = L_(0.5) * RANDOM[i];
  35         ASSERT (RINT (x) == L_(0.0));
  36         x = - x;
  37         ASSERT (RINT (x) == L_(0.0));
  38
  39         x = L_(1.0) - L_(0.5) * RANDOM[i];
  40         ASSERT (RINT (x) == L_(1.0));
  41         x = - x;
  42         ASSERT (RINT (x) == - L_(1.0));
  43
  44         x = L_(1.0) + L_(0.5) * RANDOM[i];
  45         ASSERT (RINT (x) == L_(1.0));
  46         x = - x;
  47         ASSERT (RINT (x) == - L_(1.0));
  48
  49         x = L_(2.0) - L_(0.5) * RANDOM[i];
  50         ASSERT (RINT (x) == L_(2.0));
  51         x = - x;
  52         ASSERT (RINT (x) == - L_(2.0));
  53       }
  54   }
  55 }