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/* 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;
}
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