1  /* Test file for mpfr_log10p1.
       2  
       3  Copyright 2001-2023 Free Software Foundation, Inc.
       4  Contributed by the AriC and Caramba projects, INRIA.
       5  
       6  This file is part of the GNU MPFR Library.
       7  
       8  The GNU MPFR Library is free software; you can redistribute it and/or modify
       9  it under the terms of the GNU Lesser General Public License as published by
      10  the Free Software Foundation; either version 3 of the License, or (at your
      11  option) any later version.
      12  
      13  The GNU MPFR Library is distributed in the hope that it will be useful, but
      14  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      15  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
      16  License for more details.
      17  
      18  You should have received a copy of the GNU Lesser General Public License
      19  along with the GNU MPFR Library; see the file COPYING.LESSER.  If not, see
      20  https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
      21  51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
      22  
      23  #include "mpfr-test.h"
      24  
      25  #define TEST_FUNCTION mpfr_log10p1
      26  #define TEST_RANDOM_EMAX 80
      27  #include "tgeneric.c"
      28  
      29  static void
      30  special (void)
      31  {
      32    mpfr_t x;
      33    int inex;
      34  
      35    mpfr_init2 (x, MPFR_PREC_MIN);
      36  
      37    mpfr_set_nan (x);
      38    mpfr_clear_flags ();
      39    inex = mpfr_log10p1 (x, x, MPFR_RNDN);
      40    MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0);
      41    MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);
      42  
      43    mpfr_set_inf (x, -1);
      44    mpfr_clear_flags ();
      45    inex = mpfr_log10p1 (x, x, MPFR_RNDN);
      46    MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0);
      47    MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);
      48  
      49    mpfr_set_inf (x, 1);
      50    mpfr_clear_flags ();
      51    inex = mpfr_log10p1 (x, x, MPFR_RNDN);
      52    MPFR_ASSERTN (mpfr_inf_p (x) && mpfr_sgn (x) > 0 && inex == 0);
      53    MPFR_ASSERTN (__gmpfr_flags == 0);
      54  
      55    mpfr_set_ui (x, 0, MPFR_RNDN);
      56    mpfr_clear_flags ();
      57    inex = mpfr_log10p1 (x, x, MPFR_RNDN);
      58    MPFR_ASSERTN (mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS (x) && inex == 0);
      59    MPFR_ASSERTN (__gmpfr_flags == 0);
      60    mpfr_neg (x, x, MPFR_RNDN);
      61    mpfr_clear_flags ();
      62    inex = mpfr_log10p1 (x, x, MPFR_RNDN);
      63    MPFR_ASSERTN (mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_NEG (x) && inex == 0);
      64    MPFR_ASSERTN (__gmpfr_flags == 0);
      65  
      66    mpfr_set_si (x, -1, MPFR_RNDN);
      67    mpfr_clear_flags ();
      68    inex = mpfr_log10p1 (x, x, MPFR_RNDN);
      69    MPFR_ASSERTN (mpfr_inf_p (x) && mpfr_sgn (x) < 0 && inex == 0);
      70    MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0);
      71  
      72    mpfr_set_si (x, -2, MPFR_RNDN);
      73    mpfr_clear_flags ();
      74    inex = mpfr_log10p1 (x, x, MPFR_RNDN);
      75    MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0);
      76    MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);
      77  
      78    /* include one hard-coded test */
      79    mpfr_set_prec (x, 32);
      80    mpfr_set_ui (x, 17, MPFR_RNDN);
      81    inex = mpfr_log10p1 (x, x, MPFR_RNDN);
      82    MPFR_ASSERTN (mpfr_cmp_ui_2exp (x, 1347838589UL, -30) == 0);
      83    MPFR_ASSERTN (inex < 0);
      84  
      85    mpfr_clear (x);
      86  }
      87  
      88  /* check exact cases, when 1+x = 10^k (can only occur for k >= 0) */
      89  static void
      90  check_exact (void)
      91  {
      92    mpfr_exp_t k;
      93    mpfr_t x;
      94    int inex, r;
      95  
      96  #define KMAX 100
      97    mpfr_init2 (x, 333); /* 10^100 has 333 bits */
      98    for (k = 0; k <= KMAX; k++)
      99      RND_LOOP (r)
     100        {
     101          inex = mpfr_ui_pow_ui (x, 10, k, (mpfr_rnd_t) r);
     102          MPFR_ASSERTN(inex == 0);
     103          inex = mpfr_sub_ui (x, x, 1, (mpfr_rnd_t) r);
     104          MPFR_ASSERTN(inex == 0);
     105          inex = mpfr_log10p1 (x, x, (mpfr_rnd_t) r);
     106          MPFR_ASSERTN(mpfr_cmp_si0 (x, k) == 0);
     107          MPFR_ASSERTN(inex == 0);
     108        }
     109    mpfr_clear (x);
     110  }
     111  
     112  int
     113  main (int argc, char *argv[])
     114  {
     115    tests_start_mpfr ();
     116  
     117    special ();
     118  
     119    check_exact ();
     120  
     121    test_generic (MPFR_PREC_MIN, 100, 50);
     122  
     123    tests_end_mpfr ();
     124    return 0;
     125  }