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