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

     1  /* Test mpz_hamdist.
     2  
     3  Copyright 2001, 2002 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 "tests.h"
    25  
    26  
    27  void
    28  check_twobits (void)
    29  {
    30    unsigned long  i, j, got, want;
    31    mpz_t  x, y;
    32  
    33    mpz_init (x);
    34    mpz_init (y);
    35    for (i = 0; i < 5 * GMP_NUMB_BITS; i++)
    36      {
    37        for (j = 0; j < 5 * GMP_NUMB_BITS; j++)
    38          {
    39            mpz_set_ui (x, 0L);
    40            mpz_setbit (x, i);
    41            mpz_set_ui (y, 0L);
    42            mpz_setbit (y, j);
    43  
    44            want = 2 * (i != j);
    45            got = mpz_hamdist (x, y);
    46            if (got != want)
    47              {
    48                printf    ("mpz_hamdist wrong on 2 bits pos/pos\n");
    49              wrong:
    50                printf    ("  i    %lu\n", i);
    51                printf    ("  j    %lu\n", j);
    52                printf    ("  got  %lu\n", got);
    53                printf    ("  want %lu\n", want);
    54                mpz_trace ("  x   ", x);
    55                mpz_trace ("  y   ", y);
    56                abort();
    57              }
    58  
    59            mpz_neg (x, x);
    60            mpz_neg (y, y);
    61            want = ABS ((long) (i-j));
    62            got = mpz_hamdist (x, y);
    63            if (got != want)
    64              {
    65                printf    ("mpz_hamdist wrong on 2 bits neg/neg\n");
    66                goto wrong;
    67              }
    68          }
    69  
    70      }
    71    mpz_clear (x);
    72    mpz_clear (y);
    73  }
    74  
    75  
    76  void
    77  check_rand (void)
    78  {
    79    gmp_randstate_ptr  rands = RANDS;
    80    unsigned long  got, want;
    81    int    i;
    82    mpz_t  x, y;
    83  
    84    mpz_init (x);
    85    mpz_init (y);
    86  
    87    for (i = 0; i < 2000; i++)
    88      {
    89        mpz_erandomb (x, rands, 6 * GMP_NUMB_BITS);
    90        mpz_negrandom (x, rands);
    91        mpz_mul_2exp (x, x, urandom() % (4 * GMP_NUMB_BITS));
    92  
    93        mpz_erandomb (y, rands, 6 * GMP_NUMB_BITS);
    94        mpz_negrandom (y, rands);
    95        mpz_mul_2exp (y, y, urandom() % (4 * GMP_NUMB_BITS));
    96  
    97        want = refmpz_hamdist (x, y);
    98        got = mpz_hamdist (x, y);
    99        if (got != want)
   100          {
   101            printf    ("mpz_hamdist wrong on random\n");
   102            printf    ("  got  %lu\n", got);
   103            printf    ("  want %lu\n", want);
   104            mpz_trace ("  x   ", x);
   105            mpz_trace ("  y   ", y);
   106            abort();
   107          }
   108      }
   109    mpz_clear (x);
   110    mpz_clear (y);
   111  }
   112  
   113  int
   114  main (void)
   115  {
   116    tests_start ();
   117    mp_trace_base = -16;
   118  
   119    check_twobits ();
   120    check_rand ();
   121  
   122    tests_end ();
   123    exit (0);
   124  }