tests/test-count-one-bits.c

   1 /*
   2  * Copyright (C) 2007-2017 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 <http://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Ben Pfaff.  */
  18
  19 #include <config.h>
  20
  21 #include "count-one-bits.h"
  22
  23 #include <limits.h>
  24 #include <stdio.h>
  25
  26 #include "macros.h"
  27
  28 #define UINT_BIT (sizeof (unsigned int) * CHAR_BIT)
  29 #define ULONG_BIT (sizeof (unsigned long int) * CHAR_BIT)
  30 #define ULLONG_BIT (sizeof (unsigned long long int) * CHAR_BIT)
  31
  32 #ifndef ULLONG_MAX
  33 # define HALF (1ULL << (sizeof (unsigned long long int) * CHAR_BIT - 1))
  34 # define ULLONG_MAX (HALF - 1 + HALF)
  35 #endif
  36
  37 int
  38 main (int argc, char *argv[])
  39 {
  40   int i, j;
  41
  42 #define TEST_COUNT_ONE_BITS(FUNC, TYPE, BITS, MAX, ONE) \
  43   ASSERT (FUNC (0) == 0);                               \
  44   for (i = 0; i < BITS; i++)                            \
  45     {                                                   \
  46       ASSERT (FUNC (ONE << i) == 1);                    \
  47       for (j = i + 1; j < BITS; j++)                    \
  48         ASSERT (FUNC ((ONE << i) | (ONE << j)) == 2);   \
  49     }                                                   \
  50   for (i = 0; i < 1000; i++)                            \
  51     {                                                   \
  52       TYPE value = rand () ^ (rand () << 31 << 1);      \
  53       int count = 0;                                    \
  54       for (j = 0; j < BITS; j++)                        \
  55         count += (value & (ONE << j)) != 0;             \
  56       ASSERT (count == FUNC (value));                   \
  57     }                                                   \
  58   ASSERT (FUNC (MAX) == BITS);
  59
  60   TEST_COUNT_ONE_BITS (count_one_bits, unsigned int, UINT_BIT, UINT_MAX, 1U);
  61   TEST_COUNT_ONE_BITS (count_one_bits_l, unsigned long int,
  62                        ULONG_BIT, ULONG_MAX, 1UL);
  63 #ifdef HAVE_UNSIGNED_LONG_LONG_INT
  64   TEST_COUNT_ONE_BITS (count_one_bits_ll,
  65                        unsigned long long int, ULLONG_BIT, ULLONG_MAX, 1ULL);
  66 #endif
  67
  68   return 0;
  69 }