tests/test-log2-ieee.h

   1 /* Test of log2*() 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   /* Negative arguments.  */
  23   ASSERT (ISNAN (LOG2 (- L_(0.00001))));
  24   ASSERT (ISNAN (LOG2 (- L_(1.0))));
  25   ASSERT (ISNAN (LOG2 (- L_(1000000.0))));
  26   ASSERT (ISNAN (LOG2 (- INFINITY)));
  27
  28   /* NaN.  */
  29   ASSERT (ISNAN (LOG2 (NAN)));
  30
  31   /* Only rational value.  */
  32   {
  33     DOUBLE z = LOG2 (L_(1.0));
  34     ASSERT (z == L_(0.0));
  35     ASSERT (!signbit (z));
  36   }
  37
  38   /* Infinity.  */
  39   ASSERT (LOG2 (INFINITY) == INFINITY);
  40 }