kc3-lang/gnulib/tests/test-count-one-bits.c

• Show log

  Commit

• Hash : 7b089321
  Author :
  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

Download

• tests/test-count-one-bits.c

• /*
   * Copyright (C) 2007-2025 Free Software Foundation, Inc.
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Ben Pfaff.  */
  
  #include <config.h>
  
  #include "count-one-bits.h"
  
  #include <limits.h>
  #include <stdio.h>
  
  #include "macros.h"
  
  #define UINT_BIT (sizeof (unsigned int) * CHAR_BIT)
  #define ULONG_BIT (sizeof (unsigned long int) * CHAR_BIT)
  #define ULLONG_BIT (sizeof (unsigned long long int) * CHAR_BIT)
  
  int
  main (int argc, char *argv[])
  {
    int i, j;
  
  #define TEST_COUNT_ONE_BITS(FUNC, TYPE, BITS, MAX, ONE)   \
    ASSERT (FUNC (0) == 0);                                 \
    for (i = 0; i < BITS; i++)                              \
      {                                                     \
        ASSERT (FUNC (ONE << i) == 1);                      \
        for (j = i + 1; j < BITS; j++)                      \
          ASSERT (FUNC ((ONE << i) | (ONE << j)) == 2);     \
      }                                                     \
    for (i = 0; i < 1000; i++)                              \
      {                                                     \
        /* RAND_MAX is most often 0x7fff or 0x7fffffff.  */ \
        TYPE value =                                        \
          (RAND_MAX <= 0xffff                               \
           ? ((TYPE) rand () >> 3)                          \
             ^ (((TYPE) rand () >> 3) << 12)                \
             ^ (((TYPE) rand () >> 3) << 24)                \
             ^ (((TYPE) rand () >> 3) << 30 << 6)           \
             ^ (((TYPE) rand () >> 3) << 30 << 18)          \
             ^ (((TYPE) rand () >> 3) << 30 << 30)          \
           : ((TYPE) rand () >> 3)                          \
             ^ (((TYPE) rand () >> 3) << 22)                \
             ^ (((TYPE) rand () >> 3) << 22 << 22));        \
        int count = 0;                                      \
        for (j = 0; j < BITS; j++)                          \
          count += (value & (ONE << j)) != 0;               \
        ASSERT (count == FUNC (value));                     \
      }                                                     \
    ASSERT (FUNC (MAX) == BITS);
  
    TEST_COUNT_ONE_BITS (count_one_bits, unsigned int, UINT_BIT, UINT_MAX, 1U);
    TEST_COUNT_ONE_BITS (count_one_bits_l, unsigned long int,
                         ULONG_BIT, ULONG_MAX, 1UL);
    TEST_COUNT_ONE_BITS (count_one_bits_ll, unsigned long long int,
                         ULLONG_BIT, ULLONG_MAX, 1ULL);
  
    return test_exit_status;
  }
  

Download