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/* Test file for mpz_set_fr / mpfr_get_z.
Copyright 2004, 2006 Free Software Foundation.
This file is part of the MPFR Library.
The 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 2.1 of the License, or (at your
option) any later version.
The 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 MPFR Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Place, Fifth Floor, Boston,
MA 02110-1301, USA. */
#include <stdio.h>
#include <stdlib.h>
#include "mpfr-test.h"
static void
check_diff (void)
{
mpfr_t x;
mpz_t z;
mpz_init (z);
mpfr_init2 (x, 2);
mpfr_set_ui (x, 2047, GMP_RNDU);
mpz_set_fr (z, x, GMP_RNDN);
if (mpz_cmp_ui (z, 2048) != 0)
{
printf ("get_z RU 2048 failed\n");
exit (1);
}
mpfr_clear (x);
mpz_clear (z);
}
static void
check_one (mpz_ptr z)
{
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*BITS_PER_MP_LIMB ; sh < 2*BITS_PER_MP_LIMB ; sh++)
{
for (neg = 0; neg <= 1; neg++)
{
mpz_neg (z, z);
mpfr_set_z (f, z, GMP_RNDN);
if (sh < 0)
{
mpz_tdiv_q_2exp (z, z, -sh);
mpfr_div_2exp (f, f, -sh, GMP_RNDN);
}
else
{
mpz_mul_2exp (z, z, sh);
mpfr_mul_2exp (f, f, sh, GMP_RNDN);
}
mpfr_get_z (got, f, GMP_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);
}
}
}
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*BITS_PER_MP_LIMB);
check_one (z);
mpz_rrandomb (z, RANDS, 5*BITS_PER_MP_LIMB);
check_one (z);
mpz_clear (z);
}
int
main (void)
{
tests_start_mpfr ();
check ();
check_diff ();
tests_end_mpfr ();
return 0;
}
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