1  /* Test for powl
       2     Copyright (C) 2011-2023 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 <stdio.h>
      20  #include <math.h>
      21  #include <float.h>
      22  #include <ieee754.h>
      23  
      24  static int
      25  do_test (void)
      26  {
      27    int result = 0;
      28  
      29  #if LDBL_MANT_DIG == 64
      30      {
      31        long double x = 1e-20;
      32        union ieee854_long_double u;
      33        u.ieee.mantissa0 = 1;
      34        u.ieee.mantissa1 = 1;
      35        u.ieee.exponent = 0;
      36        u.ieee.negative = 0;
      37        (void) powl (0.2, u.d);
      38        x = powl (x, 1.5);
      39        if (fabsl (x - 1e-30) > 1e-10)
      40  	{
      41  	  printf ("powl (1e-20, 1.5): wrong result: %Lg\n", x);
      42  	  result = 1;
      43  	}
      44      }
      45  #endif
      46  
      47    return result;
      48  }
      49  
      50  #define TEST_FUNCTION do_test ()
      51  #include "../test-skeleton.c"