math/test-powl.c

   1 /* Test for powl
   2    Copyright (C) 2011-2020 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"