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

     1  /* Test mpf_set, mpf_init_set.
     2  
     3  Copyright 2004, 2012 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  void
    27  check_reuse (void)
    28  {
    29    /* Try mpf_set(f,f) when f is bigger than prec.  In the past this had
    30       resulted in an MPN_COPY with invalid operand overlap. */
    31    mpf_t  f;
    32    mp_size_t      limbs = 20;
    33    unsigned long  bits = limbs * GMP_NUMB_BITS;
    34    mpf_init2 (f, bits);
    35    refmpf_fill (f, limbs, GMP_NUMB_MAX);
    36    mpf_set_prec_raw (f, bits / 2);
    37    mpf_set (f, f);
    38    MPF_CHECK_FORMAT (f);
    39    mpf_set_prec_raw (f, bits);
    40    mpf_clear (f);
    41  }
    42  
    43  void
    44  check_random (long reps)
    45  {
    46    unsigned long test;
    47    gmp_randstate_ptr rands;
    48    mpf_t a, b;
    49    mpz_t z;
    50    int precbits;
    51  
    52  #define PRECBITS 10
    53  
    54    rands = RANDS;
    55  
    56    mpz_init (z);
    57    mpf_init2 (a, 1 << PRECBITS);
    58  
    59    for (test = 0; test < reps; test++)
    60      {
    61        mpz_urandomb (z, rands, PRECBITS + 1);
    62        precbits = mpz_get_ui (z) + 1;
    63        mpz_urandomb (z, rands, precbits);
    64        mpz_setbit (z, precbits  - 1);	/* make sure msb is set */
    65        mpf_set_z (a, z);
    66        if (precbits & 1)
    67  	mpf_neg (a, a);
    68        mpz_urandomb (z, rands, PRECBITS);
    69        mpf_div_2exp (a, a, mpz_get_ui (z) + 1);
    70        mpz_urandomb (z, rands, PRECBITS);
    71        precbits -= mpz_get_ui (z);
    72        if (precbits <= 0)
    73  	precbits = 1 - precbits;
    74        mpf_set_default_prec (precbits);
    75  
    76        mpf_init_set (b, a);
    77        MPF_CHECK_FORMAT (b);
    78        if (!mpf_eq (a, b, precbits))
    79  	{
    80  	  printf ("mpf_init_set wrong.\n");
    81  	  abort();
    82  	}
    83  
    84        mpf_set_ui (b, 0);
    85        mpf_set (b, a);
    86        MPF_CHECK_FORMAT (b);
    87        if (!mpf_eq (a, b, precbits))
    88  	{
    89  	  printf ("mpf_set wrong.\n");
    90  	  abort();
    91  	}
    92  
    93        mpf_clear (b);
    94      }
    95  
    96    mpf_clear (a);
    97    mpz_clear (z);
    98  }
    99  
   100  int
   101  main (int argc, char *argv[])
   102  {
   103    long reps = 10000;
   104  
   105    tests_start ();
   106    TESTS_REPS (reps, argv, argc);
   107  
   108    check_reuse ();
   109    check_random (reps);
   110  
   111    tests_end ();
   112    exit (0);
   113  }