tests/test-expm1-ieee.h

   1 /* Test of expm1*() 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   /* [MX] shaded specification in POSIX.  */
  21
  22   /* Underflow.  */
  23   ASSERT (EXPM1 (-100000.0) == - L_(1.0));
  24
  25   /* NaN.  */
  26   ASSERT (ISNAN (EXPM1 (NAN)));
  27
  28   /* Zero.  */
  29   {
  30     DOUBLE z = EXPM1 (L_(0.0));
  31     ASSERT (z == L_(0.0));
  32     ASSERT (!signbit (z));
  33   }
  34   {
  35     DOUBLE z = EXPM1 (MINUS_ZERO);
  36     ASSERT (z == L_(0.0));
  37     ASSERT (!!signbit (z) == !!signbit (MINUS_ZERO));
  38   }
  39
  40   /* Infinity.  */
  41   ASSERT (EXPM1 (- INFINITY) == - L_(1.0));
  42   ASSERT (EXPM1 (INFINITY) == INFINITY);
  43 }