/* Test file for mpz_set_fr / mpfr_get_z.
Copyright 2004, 2006-2017 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
http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "mpfr-test.h"
static void
check_diff (void)
{
int inex;
mpfr_t x;
mpz_t z;
mpfr_exp_t emin;
mpz_init (z);
mpfr_init2 (x, 2);
mpfr_set_ui (x, 2047, MPFR_RNDU);
mpz_set_fr (z, x, MPFR_RNDN);
if (mpz_cmp_ui (z, 2048) != 0)
{
printf ("get_z RU 2048 failed\n");
exit (1);
}
mpfr_set_prec (x, 6);
mpfr_set_str (x, "17.5", 10, MPFR_RNDN);
inex = mpfr_get_z (z, x, MPFR_RNDN);
if (inex <= 0 || mpz_cmp_ui (z, 18) != 0)
{
printf ("get_z RN 17.5 failed\n");
exit (1);
}
/* save default emin */
emin = mpfr_get_emin ();;
mpfr_set_emin (17);
mpfr_set_ui (x, 0, MPFR_RNDN);
inex = mpfr_get_z (z, x, MPFR_RNDN);
if (inex != 0 || mpz_cmp_ui (z, 0) != 0)
{
printf ("get_z 0 failed\n");
exit (1);
}
/* restore default emin */
mpfr_set_emin (emin);
mpfr_clear (x);
mpz_clear (z);
}
static void
check_one (mpz_ptr z)
{
int inex;
int sh, neg;
mpfr_t f;
mpz_t got;
mpfr_init2 (f, MAX( mpz_sizeinbase (z, 2), MPFR_PREC_MIN) );
mpz_init (got);
for (sh = -2*GMP_NUMB_BITS ; sh < 2*GMP_NUMB_BITS ; sh++)
{
for (neg = 0; neg <= 1; neg++)
{
mpz_neg (z, z);
mpfr_set_z (f, z, MPFR_RNDN);
if (sh < 0)
{
mpz_tdiv_q_2exp (z, z, -sh);
mpfr_div_2exp (f, f, -sh, MPFR_RNDN);
}
else
{
mpz_mul_2exp (z, z, sh);
mpfr_mul_2exp (f, f, sh, MPFR_RNDN);
}
inex = mpfr_get_z (got, f, MPFR_RNDZ);
if (mpz_cmp (got, z) != 0)
{
printf ("Wrong result for shift=%d\n", sh);
printf (" f "); mpfr_dump (f);
printf (" got "); mpz_dump (got);
printf (" want "); mpz_dump (z);
exit (1);
}
if (! SAME_SIGN (inex, - mpfr_cmp_z (f, z)))
{
printf ("Wrong inexact value for shift=%d\n", sh);
printf (" f "); mpfr_dump (f);
printf (" got %+d\n", inex);
printf (" want %+d\n", -mpfr_cmp_z (f, z));
exit (1);
}
}
}
mpfr_clear (f);
mpz_clear (got);
}
static void
check (void)
{
mpz_t z;
mpz_init (z);
mpz_set_ui (z, 0L);
check_one (z);
mpz_set_si (z, 123L);
check_one (z);
mpz_rrandomb (z, RANDS, 2*GMP_NUMB_BITS);
check_one (z);
mpz_rrandomb (z, RANDS, 5*GMP_NUMB_BITS);
check_one (z);
mpz_clear (z);
}
static void
special (void)
{
int inex;
mpfr_t x;
mpz_t z;
int i;
mpfr_exp_t e;
mpfr_init2 (x, 2);
mpz_init (z);
for (i = -1; i <= 1; i++)
{
if (i != 0)
mpfr_set_nan (x);
else
mpfr_set_inf (x, i);
mpfr_clear_flags ();
inex = mpfr_get_z (z, x, MPFR_RNDN);
if (!mpfr_erangeflag_p () || inex != 0 || mpz_cmp_ui (z, 0) != 0)
{
printf ("special() failed on mpfr_get_z for i = %d\n", i);
exit (1);
}
mpfr_clear_flags ();
e = mpfr_get_z_2exp (z, x);
if (!mpfr_erangeflag_p () || e != __gmpfr_emin ||
mpz_cmp_ui (z, 0) != 0)
{
printf ("special() failed on mpfr_get_z_2exp for i = %d\n", i);
exit (1);
}
}
mpfr_clear (x);
mpz_clear (z);
}
int
main (void)
{
tests_start_mpfr ();
check ();
check_diff ();
special ();
tests_end_mpfr ();
return 0;
}