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-impl.h"
      23  #include "tests.h"
      24  
      25  void
      26  check_reuse (void)
      27  {
      28    /* Try mpf_set(f,f) when f is bigger than prec.  In the past this had
      29       resulted in an MPN_COPY with invalid operand overlap. */
      30    mpf_t  f;
      31    mp_size_t      limbs = 20;
      32    unsigned long  bits = limbs * GMP_NUMB_BITS;
      33    mpf_init2 (f, bits);
      34    refmpf_fill (f, limbs, GMP_NUMB_MAX);
      35    mpf_set_prec_raw (f, bits / 2);
      36    mpf_set (f, f);
      37    MPF_CHECK_FORMAT (f);
      38    mpf_set_prec_raw (f, bits);
      39    mpf_clear (f);
      40  }
      41  
      42  void
      43  check_random (long reps)
      44  {
      45    unsigned long test;
      46    gmp_randstate_ptr rands;
      47    mpf_t a, b;
      48    mpz_t z;
      49    int precbits;
      50  
      51  #define PRECBITS 10
      52  
      53    rands = RANDS;
      54  
      55    mpz_init (z);
      56    mpf_init2 (a, 1 << PRECBITS);
      57  
      58    for (test = 0; test < reps; test++)
      59      {
      60        mpz_urandomb (z, rands, PRECBITS + 1);
      61        precbits = mpz_get_ui (z) + 1;
      62        mpz_urandomb (z, rands, precbits);
      63        mpz_setbit (z, precbits  - 1);	/* make sure msb is set */
      64        mpf_set_z (a, z);
      65        if (precbits & 1)
      66  	mpf_neg (a, a);
      67        mpz_urandomb (z, rands, PRECBITS);
      68        mpf_div_2exp (a, a, mpz_get_ui (z) + 1);
      69        mpz_urandomb (z, rands, PRECBITS);
      70        precbits -= mpz_get_ui (z);
      71        if (precbits <= 0)
      72  	precbits = 1 - precbits;
      73        mpf_set_default_prec (precbits);
      74  
      75        mpf_init_set (b, a);
      76        MPF_CHECK_FORMAT (b);
      77        if (!mpf_eq (a, b, precbits))
      78  	{
      79  	  printf ("mpf_init_set wrong.\n");
      80  	  abort();
      81  	}
      82  
      83        mpf_set_ui (b, 0);
      84        mpf_set (b, a);
      85        MPF_CHECK_FORMAT (b);
      86        if (!mpf_eq (a, b, precbits))
      87  	{
      88  	  printf ("mpf_set wrong.\n");
      89  	  abort();
      90  	}
      91  
      92        mpf_clear (b);
      93      }
      94  
      95    mpf_clear (a);
      96    mpz_clear (z);
      97  }
      98  
      99  int
     100  main (int argc, char *argv[])
     101  {
     102    long reps = 10000;
     103  
     104    tests_start ();
     105    TESTS_REPS (reps, argv, argc);
     106  
     107    check_reuse ();
     108    check_random (reps);
     109  
     110    tests_end ();
     111    exit (0);
     112  }