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

     1  /* Test binvert_limb.
     2  
     3  Copyright 2000-2003 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 <string.h>
    23  #include "gmp.h"
    24  #include "gmp-impl.h"
    25  #include "longlong.h"
    26  #include "tests.h"
    27  
    28  
    29  void
    30  one (mp_limb_t n)
    31  {
    32    mp_limb_t  inv, prod;
    33  
    34    binvert_limb (inv, n);
    35    prod = (inv * n) & GMP_NUMB_MASK;
    36    if (prod != 1)
    37      {
    38        printf ("binvert_limb wrong\n");
    39        mp_limb_trace ("  n       ", n);
    40        mp_limb_trace ("  got     ", inv);
    41        mp_limb_trace ("  product ", prod);
    42        abort ();
    43      }
    44  }
    45  
    46  void
    47  some (void)
    48  {
    49    int  i;
    50    for (i = 0; i < 10000; i++)
    51      one (refmpn_random_limb () | 1);
    52  }
    53  
    54  void
    55  all (void)
    56  {
    57    mp_limb_t  n;
    58  
    59    n = 1;
    60    do {
    61      one (n);
    62      n += 2;
    63    } while (n != 1);
    64  }
    65  
    66  
    67  int
    68  main (int argc, char *argv[])
    69  {
    70    tests_start ();
    71  
    72    if (argc >= 2 && strcmp (argv[1], "-a") == 0)
    73      {
    74        /* it's feasible to run all values on a 32-bit limb, but not a 64-bit */
    75        all ();
    76      }
    77    else
    78      {
    79        some ();
    80      }
    81  
    82    tests_end ();
    83    exit (0);
    84  }