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/* test file for digamma function
Copyright 2009-2021 Free Software Foundation, Inc.
Contributed by the AriC 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/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include "mpfr-test.h"
#define TEST_FUNCTION mpfr_digamma
#include "tgeneric.c"
static void
special (void)
{
mpfr_t x, y;
mpfr_init (x);
mpfr_init (y);
mpfr_set_inf (y, -1);
mpfr_set_inf (x, 1);
mpfr_digamma (y, x, MPFR_RNDN);
if (mpfr_inf_p (y) == 0 || mpfr_sgn (y) < 0)
{
printf ("error for Psi(+Inf)\n");
printf ("expected +Inf\n");
printf ("got ");
mpfr_dump (y);
exit (1);
}
mpfr_clear (x);
mpfr_clear (y);
}
/* With some GMP_CHECK_RANDOMIZE values, test_generic triggers an error
tests_addsize(): too much memory (576460752303432776 bytes)
Each time on prec = 200, n = 3, xprec = 140.
The following test is a more general testcase.
*/
static void
bug20210206 (void)
{
#define NPREC 4
mpfr_t x, y[NPREC], z;
mpfr_exp_t emin, emax;
int i, precx, precy[NPREC] = { 200, 400, 520, 1416 };
emin = mpfr_get_emin ();
emax = mpfr_get_emax ();
set_emin (MPFR_EMIN_MIN);
set_emax (MPFR_EMAX_MAX);
for (i = 0; i < NPREC; i++)
mpfr_init2 (y[i], precy[i]);
mpfr_init2 (z, precy[0]);
for (precx = MPFR_PREC_MIN; precx < 150; precx++)
{
mpfr_init2 (x, precx);
mpfr_setmax (x, __gmpfr_emax);
for (i = 0; i < NPREC; i++)
mpfr_digamma (y[i], x, MPFR_RNDA);
mpfr_set (z, y[1], MPFR_RNDA);
MPFR_ASSERTN (mpfr_equal_p (y[0], z));
mpfr_clear (x);
}
for (i = 0; i < NPREC; i++)
mpfr_clear (y[i]);
mpfr_clear (z);
set_emin (emin);
set_emax (emax);
}
/* another test that fails with GMP_CHECK_RANDOMIZE=1612741376857003
on revision 14398 */
static void
bug20210208 (void)
{
mpfr_t x, y;
int inex;
mpfr_init2 (x, 73);
mpfr_init2 (y, 1);
mpfr_set_str (x, "1.4613470547060071827450", 10, MPFR_RNDN);
mpfr_clear_flags ();
inex = mpfr_digamma (y, x, MPFR_RNDU);
MPFR_ASSERTN (mpfr_cmp_si_2exp (y, -1, -12) == 0);
MPFR_ASSERTN (inex > 0);
MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_INEXACT);
mpfr_clear (x);
mpfr_clear (y);
}
/* another test that fails with GMP_CHECK_RANDOMIZE=1613197421465830
on revision 14429 */
static void
bug20210215 (void)
{
mpfr_t x, y;
int inex;
mpfr_init2 (x, 510);
mpfr_init2 (y, 4);
mpfr_set_str (x, "-8.2923051438433494998166335341807999322052669984208422481227138906096000469898717007386115912802685588348601663465077353194268894939972221117314512518182580e+35", 10, MPFR_RNDN);
mpfr_clear_flags ();
inex = mpfr_digamma (y, x, MPFR_RNDU);
MPFR_ASSERTN (mpfr_cmp_ui0 (y, 88) == 0);
MPFR_ASSERTN (inex > 0);
MPFR_ASSERTN (__gmpfr_flags == MPFR_FLAGS_INEXACT);
mpfr_clear (x);
mpfr_clear (y);
}
int
main (int argc, char *argv[])
{
tests_start_mpfr ();
special ();
bug20210206 ();
bug20210208 ();
bug20210215 ();
test_generic (MPFR_PREC_MIN, 200, 20);
data_check ("data/digamma", mpfr_digamma, "mpfr_digamma");
tests_end_mpfr ();
return 0;
}
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