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/* Test file for mpfr_log10.
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_log10 (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_log10 (a, b, rnd_mode);
if (ok)
{
printf (" ");
mpfr_print_raw (a);
printf ("\n");
}
return res;
}
#else
#define test_log10 mpfr_log10
#endif
#define TEST_FUNCTION test_log10
#define TEST_RANDOM_POS 8
#include "tgeneric.c"
/* On 2023-02-13, one gets an infinite loop in mpfr_log10 on both
32-bit and 64-bit hosts when the precision is not large enough
(precision 12 and below). */
static void
bug20230213 (void)
{
mpfr_exp_t old_emin, old_emax, e;
mpfr_t t, x, y0, y1, y2;
int prec;
old_emin = mpfr_get_emin ();
old_emax = mpfr_get_emax ();
set_emin (MPFR_EMIN_MIN);
set_emax (MPFR_EMAX_MAX);
e = mpfr_get_emax () - 1;
/* The precisions of t and y0 should be large enough to avoid
a hard-to-round case for the target precisions. */
mpfr_inits2 (64, t, y0, (mpfr_ptr) 0);
mpfr_set_exp_t (y0, e, MPFR_RNDN);
mpfr_log_ui (t, 10, MPFR_RNDN);
mpfr_div (y0, y0, t, MPFR_RNDN);
mpfr_log_ui (t, 2, MPFR_RNDN);
mpfr_mul (y0, y0, t, MPFR_RNDN);
for (prec = 16; prec >= MPFR_PREC_MIN; prec--)
{
mpfr_inits2 (prec, x, y1, y2, (mpfr_ptr) 0);
mpfr_set (y1, y0, MPFR_RNDN);
mpfr_set_ui_2exp (x, 1, e, MPFR_RNDN);
mpfr_log10 (y2, x, MPFR_RNDN);
MPFR_ASSERTN (MPFR_IS_PURE_FP (y2));
MPFR_ASSERTN (MPFR_IS_POS (y2));
if (! mpfr_equal_p (y1, y2))
{
printf ("Error in bug20230213.\n");
printf ("Expected ");
mpfr_dump (y1);
printf ("Got ");
mpfr_dump (y2);
exit (1);
}
mpfr_clears (x, y1, y2, (mpfr_ptr) 0);
}
mpfr_clears (t, y0, (mpfr_ptr) 0);
set_emin (old_emin);
set_emax (old_emax);
}
int
main (int argc, char *argv[])
{
mpfr_t x, y;
unsigned int n;
int inex, r;
tests_start_mpfr ();
test_generic (MPFR_PREC_MIN, 100, 20);
mpfr_init2 (x, 53);
mpfr_init2 (y, 53);
RND_LOOP (r)
{
/* check NaN */
mpfr_set_nan (x);
inex = test_log10 (y, x, (mpfr_rnd_t) r);
MPFR_ASSERTN (mpfr_nan_p (y) && inex == 0);
/* check Inf */
mpfr_set_inf (x, -1);
inex = test_log10 (y, x, (mpfr_rnd_t) r);
MPFR_ASSERTN (mpfr_nan_p (y) && inex == 0);
mpfr_set_inf (x, 1);
inex = test_log10 (y, x, (mpfr_rnd_t) r);
MPFR_ASSERTN (mpfr_inf_p (y) && mpfr_sgn (y) > 0 && inex == 0);
mpfr_set_ui (x, 0, MPFR_RNDN);
inex = test_log10 (x, x, (mpfr_rnd_t) r);
MPFR_ASSERTN (mpfr_inf_p (x) && mpfr_sgn (x) < 0 && inex == 0);
mpfr_set_ui (x, 0, MPFR_RNDN);
mpfr_neg (x, x, MPFR_RNDN);
inex = test_log10 (x, x, (mpfr_rnd_t) r);
MPFR_ASSERTN (mpfr_inf_p (x) && mpfr_sgn (x) < 0 && inex == 0);
/* check negative argument */
mpfr_set_si (x, -1, MPFR_RNDN);
inex = test_log10 (y, x, (mpfr_rnd_t) r);
MPFR_ASSERTN (mpfr_nan_p (y) && inex == 0);
/* check log10(1) = 0 */
mpfr_set_ui (x, 1, MPFR_RNDN);
inex = test_log10 (y, x, (mpfr_rnd_t) r);
MPFR_ASSERTN (MPFR_IS_ZERO (y) && MPFR_IS_POS (y) && inex == 0);
/* check log10(10^n)=n */
mpfr_set_ui (x, 1, MPFR_RNDN);
for (n = 1; n <= 15; n++)
{
mpfr_mul_ui (x, x, 10, MPFR_RNDN); /* x = 10^n */
inex = test_log10 (y, x, (mpfr_rnd_t) r);
if (mpfr_cmp_ui (y, n))
{
printf ("log10(10^n) <> n for n=%u\n", n);
exit (1);
}
MPFR_ASSERTN (inex == 0);
}
}
mpfr_clear (x);
mpfr_clear (y);
bug20230213 ();
data_check ("data/log10", mpfr_log10, "mpfr_log10");
bad_cases (mpfr_log10, mpfr_exp10, "mpfr_log10",
256, -30, 30, 4, 128, 800, 50);
tests_end_mpfr ();
return 0;
}
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