1  /* Test iszero with excess precision.
       2     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <float.h>
      20  #include <math.h>
      21  #include <stdio.h>
      22  
      23  #define TEST(TYPE, TRUE_MIN)						\
      24    do									\
      25      {									\
      26        if (iszero (TRUE_MIN / 2))					\
      27  	puts ("iszero removes excess precision for " #TYPE);		\
      28        else								\
      29  	{								\
      30  	  puts ("iszero fails to remove excess precision for " #TYPE);	\
      31  	  result = 1;							\
      32  	}								\
      33      }									\
      34    while (0)
      35  
      36  static int
      37  do_test (void)
      38  {
      39    int result = 0;
      40  
      41    TEST (float, FLT_TRUE_MIN);
      42    TEST (double, DBL_TRUE_MIN);
      43    TEST (long double, LDBL_TRUE_MIN);
      44  
      45    return result;
      46  }
      47  
      48  #define TEST_FUNCTION do_test ()
      49  #include "../test-skeleton.c"