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/* Test file for mpfr_min_prec.
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"
int
main (int argc, char *argv[])
{
mpfr_t x;
mpfr_prec_t ret;
unsigned long i;
tests_start_mpfr ();
mpfr_init2 (x, 53);
/* Check special values */
mpfr_set_nan (x);
ret = mpfr_min_prec (x);
MPFR_ASSERTN (ret == 0);
mpfr_set_inf (x, 1);
ret = mpfr_min_prec (x);
MPFR_ASSERTN (ret == 0);
mpfr_set_inf (x, -1);
ret = mpfr_min_prec (x);
MPFR_ASSERTN (ret == 0);
mpfr_set_ui (x, 0, MPFR_RNDN);
ret = mpfr_min_prec (x);
MPFR_ASSERTN (ret == 0);
/* Some constants */
mpfr_set_ui (x, 1, MPFR_RNDN);
ret = mpfr_min_prec (x);
MPFR_ASSERTN (ret == 1);
mpfr_set_ui (x, 17, MPFR_RNDN);
ret = mpfr_min_prec (x);
MPFR_ASSERTN (ret == 5);
mpfr_set_ui (x, 42, MPFR_RNDN);
ret = mpfr_min_prec (x);
MPFR_ASSERTN (ret == 5);
mpfr_set_prec (x, 256);
for (i = 0; i <= 255; i++)
{
mpfr_set_ui_2exp (x, 1, i, MPFR_RNDN);
mpfr_add_ui (x, x, 1, MPFR_RNDN);
ret = mpfr_min_prec (x);
if (ret != i + 1)
{
printf ("Error for x = 2^%lu + 1\n", i);
printf ("Expected %lu, got %lu\n", i + 1, (unsigned long) ret);
exit (1);
}
}
for (i = MPFR_PREC_MIN; i <= 255; i++)
{
mpfr_set_prec (x, i);
mpfr_set_ui_2exp (x, 1, i, MPFR_RNDN);
mpfr_sub_ui (x, x, 1, MPFR_RNDN);
ret = mpfr_min_prec (x);
if (ret != i)
{
printf ("Error for x = 2^%lu - 1\n", i);
printf ("Expected %lu, got %lu\n", i, (unsigned long) ret);
exit (1);
}
}
mpfr_clear (x);
tests_end_mpfr ();
return 0;
}
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