/* Test file for mpfr_log1p.

Copyright 2001-2025 Free Software Foundation, Inc.
Contributed by the Pascaline and Caramba projects, INRIA.

This file is part of the GNU MPFR Library.

The GNU MPFR Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

The GNU MPFR Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MPFR Library; see the file COPYING.LESSER.
If not, see <https://www.gnu.org/licenses/>. */

#include "mpfr-test.h"

#ifdef CHECK_EXTERNAL
static int
test_log1p (mpfr_ptr a, mpfr_srcptr b, mpfr_rnd_t rnd_mode)
{
  int res;
  int ok = rnd_mode == MPFR_RNDN && mpfr_number_p (b) && mpfr_get_prec (a)>=53;
  if (ok)
    {
      mpfr_print_raw (b);
    }
  res = mpfr_log1p (a, b, rnd_mode);
  if (ok)
    {
      printf (" ");
      mpfr_print_raw (a);
      printf ("\n");
    }
  return res;
}
#else
#define test_log1p mpfr_log1p
#endif

#define TEST_FUNCTION test_log1p
#define TEST_RANDOM_EMAX 80
#include "tgeneric.c"

static void
special (void)
{
  mpfr_t x;
  int inex;

  mpfr_init (x);

  mpfr_set_nan (x);
  mpfr_clear_flags ();
  inex = test_log1p (x, x, MPFR_RNDN);
  MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0);
  MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);

  mpfr_set_inf (x, -1);
  mpfr_clear_flags ();
  inex = test_log1p (x, x, MPFR_RNDN);
  MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0);
  MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);

  mpfr_set_inf (x, 1);
  mpfr_clear_flags ();
  inex = test_log1p (x, x, MPFR_RNDN);
  MPFR_ASSERTN (mpfr_inf_p (x) && mpfr_sgn (x) > 0 && inex == 0);
  MPFR_ASSERTN (__gmpfr_flags == 0);

  mpfr_set_ui (x, 0, MPFR_RNDN);
  mpfr_clear_flags ();
  inex = test_log1p (x, x, MPFR_RNDN);
  MPFR_ASSERTN (mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_POS (x) && inex == 0);
  MPFR_ASSERTN (__gmpfr_flags == 0);
  mpfr_neg (x, x, MPFR_RNDN);
  mpfr_clear_flags ();
  inex = test_log1p (x, x, MPFR_RNDN);
  MPFR_ASSERTN (mpfr_cmp_ui (x, 0) == 0 && MPFR_IS_NEG (x) && inex == 0);
  MPFR_ASSERTN (__gmpfr_flags == 0);

  mpfr_set_si (x, -1, MPFR_RNDN);
  mpfr_clear_flags ();
  inex = test_log1p (x, x, MPFR_RNDN);
  MPFR_ASSERTN (mpfr_inf_p (x) && mpfr_sgn (x) < 0 && inex == 0);
  MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_DIVBY0);

  mpfr_set_si (x, -2, MPFR_RNDN);
  mpfr_clear_flags ();
  inex = test_log1p (x, x, MPFR_RNDN);
  MPFR_ASSERTN (mpfr_nan_p (x) && inex == 0);
  MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_NAN);

  mpfr_clear (x);
}

static void
other (void)
{
  mpfr_t x, y;

  /* Bug reported by Guillaume Melquiond on 2006-08-14. */
  mpfr_init2 (x, 53);
  mpfr_set_str (x, "-1.5e4f72873ed9a@-100", 16, MPFR_RNDN);
  mpfr_init2 (y, 57);
  mpfr_log1p (y, x, MPFR_RNDU);
  if (mpfr_cmp (x, y) != 0)
    {
      printf ("Error in tlog1p for x = ");
      mpfr_out_str (stdout, 16, 0, x, MPFR_RNDN);
      printf (", rnd = MPFR_RNDU\nExpected ");
      mpfr_out_str (stdout, 16, 15, x, MPFR_RNDN);
      printf ("\nGot      ");
      mpfr_out_str (stdout, 16, 15, y, MPFR_RNDN);
      printf ("\n");
      exit (1);
    }

  mpfr_clear (y);
  mpfr_clear (x);
  return;
}

int
main (int argc, char *argv[])
{
  tests_start_mpfr ();

  special ();
  other ();

  test_generic (MPFR_PREC_MIN, 100, 50);

  data_check ("data/log1p", mpfr_log1p, "mpfr_log1p");
  bad_cases (mpfr_log1p, mpfr_expm1, "mpfr_log1p", 256, -64, 9,
             4, 128, 800, 40);

  tests_end_mpfr ();
  return 0;
}
