134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/* Test mpz_set_d and mpz_init_set_d.
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Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "gmp.h"
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#include "gmp-impl.h"
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#include "tests.h"
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void
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check_data (void)
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{
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static const struct {
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double d;
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mp_size_t want_size;
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mp_limb_t want_data[2];
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} data[] = {
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{ 0.0, 0 },
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{ 1.0, 1, { 1 } },
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{ -1.0, -1, { 1 } },
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{ 123.0, 1, { 123 } },
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{ -123.0, -1, { 123 } },
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};
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mpz_t z;
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int i;
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for (i = 0; i < numberof (data); i++)
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{
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mpz_init (z);
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mpz_set_d (z, data[i].d);
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MPZ_CHECK_FORMAT (z);
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if (z->_mp_size != data[i].want_size
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|| refmpn_cmp_allowzero (z->_mp_d, data[i].want_data,
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ABS (data[i].want_size)) != 0)
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{
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printf ("mpz_set_d wrong on data[%d]\n", i);
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bad:
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d_trace (" d ", data[i].d);
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printf (" got size %ld\n", (long) z->_mp_size);
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printf (" want size %ld\n", (long) data[i].want_size);
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mpn_trace (" got z", z->_mp_d, z->_mp_size);
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mpn_trace (" want z", data[i].want_data, data[i].want_size);
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abort();
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}
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mpz_clear (z);
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mpz_init_set_d (z, data[i].d);
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MPZ_CHECK_FORMAT (z);
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if (z->_mp_size != data[i].want_size
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|| refmpn_cmp_allowzero (z->_mp_d, data[i].want_data,
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ABS (data[i].want_size)) != 0)
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{
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printf ("mpz_init_set_d wrong on data[%d]\n", i);
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goto bad;
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}
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mpz_clear (z);
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}
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}
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/* Try mpz_set_d on values 2^i+1, while such a value fits a double. */
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void
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check_2n_plus_1 (void)
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{
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volatile double p, d, diff;
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mpz_t want, got;
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int i;
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mpz_init (want);
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mpz_init (got);
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p = 1.0;
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mpz_set_ui (want, 2L); /* gives 3 on first step */
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for (i = 1; i < 500; i++)
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{
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mpz_mul_2exp (want, want, 1L);
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mpz_sub_ui (want, want, 1L); /* want = 2^i+1 */
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p *= 2.0; /* p = 2^i */
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d = p + 1.0;
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diff = d - p;
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if (diff != 1.0)
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break; /* rounding occurred, stop now */
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mpz_set_d (got, d);
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MPZ_CHECK_FORMAT (got);
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if (mpz_cmp (got, want) != 0)
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{
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printf ("mpz_set_d wrong on 2^%d+1\n", i);
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d_trace (" d ", d);
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mpz_trace (" got ", got);
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mpz_trace (" want ", want);
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abort ();
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}
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}
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mpz_clear (want);
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mpz_clear (got);
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}
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int
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main (void)
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{
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tests_start ();
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check_data ();
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check_2n_plus_1 ();
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tests_end ();
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exit (0);
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}
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