github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/tests/mpf/t-dm2exp.c (about)

     1  /* Test mpf_div, mpf_div_2exp, mpf_mul_2exp.
     2  
     3  Copyright 1996, 2000, 2001 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  
    23  #include "gmp.h"
    24  #include "gmp-impl.h"
    25  #include "tests.h"
    26  
    27  #ifndef SIZE
    28  #define SIZE 16
    29  #endif
    30  
    31  int
    32  main (int argc, char **argv)
    33  {
    34    int reps = 100000;
    35    int i;
    36    mpf_t u, v, w1, w2, w3;
    37    mp_size_t bprec = 100;
    38    mpf_t rerr, limit_rerr;
    39    mp_size_t un;
    40    mp_exp_t ue;
    41  
    42    tests_start ();
    43  
    44    if (argc > 1)
    45      {
    46        reps = strtol (argv[1], 0, 0);
    47        if (argc > 2)
    48  	bprec = strtol (argv[2], 0, 0);
    49      }
    50  
    51    mpf_set_default_prec (bprec);
    52  
    53    mpf_init (rerr);
    54    mpf_init (limit_rerr);
    55  
    56    mpf_init (u);
    57    mpf_init (v);
    58    mpf_init (w1);
    59    mpf_init (w2);
    60    mpf_init (w3);
    61  
    62    for (i = 0; i < reps; i++)
    63      {
    64        unsigned long int res_prec;
    65        unsigned long int pow2;
    66  
    67        res_prec = urandom () % (bprec + 100);
    68        mpf_set_prec (w1, res_prec);
    69        mpf_set_prec (w2, res_prec);
    70        mpf_set_prec (w3, res_prec);
    71  
    72        mpf_set_ui (limit_rerr, 1);
    73        mpf_div_2exp (limit_rerr, limit_rerr, res_prec);
    74  
    75        pow2 = urandom () % 0x10000;
    76        mpf_set_ui (v, 1);
    77        mpf_mul_2exp (v, v, pow2);
    78  
    79        un = urandom () % (2 * SIZE) - SIZE;
    80        ue = urandom () % SIZE;
    81        mpf_random2 (u, un, ue);
    82  
    83        mpf_div_2exp (w1, u, pow2);
    84        mpf_div (w2, u, v);
    85        mpf_reldiff (rerr, w1, w2);
    86        if (mpf_cmp (rerr, limit_rerr) > 0)
    87  	{
    88  	  printf ("ERROR in mpf_div or mpf_div_2exp after %d tests\n", i);
    89  	  printf ("   u = "); mpf_dump (u);
    90  	  printf ("   v = "); mpf_dump (v);
    91  	  printf ("  w1 = "); mpf_dump (w1);
    92  	  printf ("  w2 = "); mpf_dump (w2);
    93  	  abort ();
    94  	}
    95        mpf_mul_2exp (w3, w1, pow2);
    96        mpf_reldiff (rerr, u, w3);
    97        if (mpf_cmp (rerr, limit_rerr) > 0)
    98  	{
    99  	  printf ("ERROR in mpf_mul_2exp after %d tests\n", i);
   100  	  printf ("   u = "); mpf_dump (u);
   101  	  printf ("   v = "); mpf_dump (v);
   102  	  printf ("  w1 = "); mpf_dump (w1);
   103  	  printf ("  w3 = "); mpf_dump (w3);
   104  	  abort ();
   105  	}
   106      }
   107  
   108    mpf_clear (rerr);
   109    mpf_clear (limit_rerr);
   110  
   111    mpf_clear (u);
   112    mpf_clear (v);
   113    mpf_clear (w1);
   114    mpf_clear (w2);
   115    mpf_clear (w3);
   116  
   117    tests_end ();
   118    exit (0);
   119  }