tests/test-log2.c

   1 /* Test of log2() function.
   2    Copyright (C) 2010-2020 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2012.  */
  18
  19 #include <config.h>
  20
  21 #include <math.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (log2, double, (double));
  25
  26 #include <float.h>
  27
  28 #include "minus-zero.h"
  29 #include "macros.h"
  30
  31 #define DOUBLE double
  32 #define HUGEVAL HUGE_VAL
  33 #define L_(literal) literal
  34 #define MANT_DIG DBL_MANT_DIG
  35 #define MAX_EXP DBL_MAX_EXP
  36 #define MIN_EXP DBL_MIN_EXP
  37 #define MINUS_ZERO minus_zerod
  38 #define LOG2 log2
  39 #define RANDOM randomd
  40 #include "test-log2.h"
  41
  42 int
  43 main ()
  44 {
  45   /* A particular value.  */
  46   x = 0.6;
  47   y = log2 (x);
  48   ASSERT (y >= -0.7369655942 && y <= -0.7369655941);
  49
  50   test_function ();
  51
  52   return 0;
  53 }