tests/test-modf-ieee.h

   1 /* Test of modf*() function family.
   2    Copyright (C) 2012-2020 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   /* NaN.  */
  23   {
  24     DOUBLE integer_part = -9999;
  25     DOUBLE fractional_part = MODF (NAN, &integer_part);
  26     ASSERT (ISNAN (integer_part));
  27     ASSERT (ISNAN (fractional_part));
  28   }
  29
  30   /* Infinity.  */
  31   {
  32     DOUBLE integer_part = -9999;
  33     DOUBLE fractional_part = MODF (INFINITY, &integer_part);
  34     ASSERT (integer_part == INFINITY);
  35     ASSERT (fractional_part == L_(0.0));
  36     ASSERT (!signbit (fractional_part));
  37   }
  38   {
  39     DOUBLE integer_part = -9999;
  40     DOUBLE fractional_part = MODF (- INFINITY, &integer_part);
  41     ASSERT (integer_part == - INFINITY);
  42     ASSERT (fractional_part == L_(0.0));
  43     ASSERT (!!signbit (fractional_part) == !!signbit (MINUS_ZERO));
  44   }
  45 }