github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/tests/t-count_zeros.c (about)

     1  /* Test count_leading_zeros and count_trailing_zeros.
     2  
     3  Copyright 2001-2003 Free Software Foundation, Inc.
     4  
     5  This file is part of the GNU MP Library test suite.
     6  
     7  The GNU MP Library test suite is free software; you can redistribute it
     8  and/or modify it under the terms of the GNU General Public License as
     9  published by the Free Software Foundation; either version 3 of the License,
    10  or (at your option) any later version.
    11  
    12  The GNU MP Library test suite is distributed in the hope that it will be
    13  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
    14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
    15  Public License for more details.
    16  
    17  You should have received a copy of the GNU General Public License along with
    18  the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
    19  
    20  #include <stdio.h>
    21  #include <stdlib.h>
    22  #include "gmp.h"
    23  #include "gmp-impl.h"
    24  #include "longlong.h"
    25  #include "tests.h"
    26  
    27  void
    28  check_clz (int want, mp_limb_t n)
    29  {
    30    int  got;
    31    count_leading_zeros (got, n);
    32    if (got != want)
    33      {
    34        printf        ("count_leading_zeros wrong\n");
    35        mp_limb_trace ("  n    ", n);
    36        printf        ("  want %d\n", want);
    37        printf        ("  got  %d\n", got);
    38        abort ();
    39      }
    40  }
    41  
    42  void
    43  check_ctz (int want, mp_limb_t n)
    44  {
    45    int  got;
    46    count_trailing_zeros (got, n);
    47    if (got != want)
    48      {
    49        printf ("count_trailing_zeros wrong\n");
    50        mpn_trace ("  n    ", &n, (mp_size_t) 1);
    51        printf    ("  want %d\n", want);
    52        printf    ("  got  %d\n", got);
    53        abort ();
    54      }
    55  }
    56  
    57  void
    58  check_various (void)
    59  {
    60    int        i;
    61  
    62  #ifdef COUNT_LEADING_ZEROS_0
    63    check_clz (COUNT_LEADING_ZEROS_0, CNST_LIMB(0));
    64  #endif
    65  
    66    for (i=0; i < GMP_LIMB_BITS; i++)
    67      {
    68        check_clz (i, CNST_LIMB(1) << (GMP_LIMB_BITS-1-i));
    69        check_ctz (i, CNST_LIMB(1) << i);
    70  
    71        check_ctz (i, MP_LIMB_T_MAX << i);
    72        check_clz (i, MP_LIMB_T_MAX >> i);
    73      }
    74  }
    75  
    76  
    77  int
    78  main (int argc, char *argv[])
    79  {
    80    tests_start ();
    81    mp_trace_base = 16;
    82  
    83    check_various ();
    84  
    85    tests_end ();
    86    exit (0);
    87  }