kc3-lang/gnulib/tests/test-ldexp-ieee.h

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• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• tests/test-ldexp-ieee.h

• /* Test of ldexp*() function family.
     Copyright (C) 2012-2025 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  static void
  test_function (void)
  {
    int exp;
  
    /* [MX] shaded specification in POSIX.  */
  
    /* NaN.  */
    for (exp = -100000; exp <= 100000; exp += 100000)
      ASSERT (ISNAN (LDEXP (NAN, exp)));
  
    /* Signed zero.  */
    for (exp = -100000; exp <= 100000; exp += 100000)
      {
        DOUBLE z = LDEXP (L_(0.0), exp);
        ASSERT (z == L_(0.0));
        ASSERT (!signbit (z));
      }
    for (exp = -100000; exp <= 100000; exp += 100000)
      {
        DOUBLE z = LDEXP (MINUS_ZERO, exp);
        ASSERT (z == L_(0.0));
        ASSERT (!!signbit (z) == !!signbit (MINUS_ZERO));
      }
  
    /* Infinity.  */
    for (exp = -100000; exp <= 100000; exp += 100000)
      ASSERT (LDEXP (INFINITY, exp) == INFINITY);
    for (exp = -100000; exp <= 100000; exp += 100000)
      ASSERT (LDEXP (- INFINITY, exp) == - INFINITY);
  }
  

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