math/test-powl.c

   1 /* Test for powl
   2    Copyright (C) 2011 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <stdio.h>
  21 #include <math.h>
  22 #include <float.h>
  23 #include <ieee754.h>
  24
  25 int
  26 main (void)
  27 {
  28   int result = 0;
  29
  30 #ifndef NO_LONG_DOUBLE
  31 # if LDBL_MANT_DIG == 64
  32     {
  33       long double x = 1e-20;
  34       union ieee854_long_double u;
  35       u.ieee.mantissa0 = 1;
  36       u.ieee.mantissa1 = 1;
  37       u.ieee.exponent = 0;
  38       u.ieee.negative = 0;
  39       (void) powl (0.2, u.d);
  40       x = powl (x, 1.5);
  41       if (fabsl (x - 1e-30) > 1e-10)
  42         {
  43           printf ("powl (1e-20, 1.5): wrong result: %Lg\n", x);
  44           result = 1;
  45         }
  46     }
  47 # endif
  48 #endif
  49
  50   return result;
  51 }