t-set_f.c
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上传日期:2022-08-06
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- /* Test mpz_set_f.
- Copyright 2001 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP 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 MP 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 MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "tests.h"
- void
- check_one (mpz_srcptr z)
- {
- static const int shift[] = {
- 0, 1, GMP_LIMB_BITS, 2*GMP_LIMB_BITS, 5*GMP_LIMB_BITS
- };
- int sh, shneg, neg;
- mpf_t f;
- mpz_t got, want;
- mpf_init2 (f, mpz_sizeinbase(z,2));
- mpz_init (got);
- mpz_init (want);
- for (sh = 0; sh < numberof(shift); sh++)
- {
- for (shneg = 0; shneg <= 1; shneg++)
- {
- for (neg = 0; neg <= 1; neg++)
- {
- mpf_set_z (f, z);
- mpz_set (want, z);
- if (neg)
- {
- mpf_neg (f, f);
- mpz_neg (want, want);
- }
- if (shneg)
- {
- mpz_tdiv_q_2exp (want, want, shift[sh]);
- mpf_div_2exp (f, f, shift[sh]);
- }
- else
- {
- mpz_mul_2exp (want, want, shift[sh]);
- mpf_mul_2exp (f, f, shift[sh]);
- }
- mpz_set_f (got, f);
- MPZ_CHECK_FORMAT (got);
- if (mpz_cmp (got, want) != 0)
- {
- printf ("wrong resultn");
- printf (" shift %dn", shneg ? -shift[sh] : shift[sh]);
- printf (" neg %dn", neg);
- mpf_trace (" f", f);
- mpz_trace (" got", got);
- mpz_trace (" want", want);
- abort ();
- }
- }
- }
- }
- mpf_clear (f);
- mpz_clear (got);
- mpz_clear (want);
- }
- void
- check_various (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_LIMB_BITS);
- check_one (z);
- mpz_rrandomb (z, RANDS, 5*GMP_LIMB_BITS);
- check_one (z);
- mpz_clear (z);
- }
- int
- main (int argc, char *argv[])
- {
- #if GMP_NAIL_BITS == 0
- tests_start ();
- mp_trace_base = 16;
- check_various ();
- tests_end ();
- #endif
- exit (0);
- }