t-tdiv.c
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上传日期:2022-08-06
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- /* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_tdiv_qr, mpz_tdiv_q,
- mpz_tdiv_r, mpz_mul.
- Copyright 1991, 1993, 1994, 1996, 1997, 2000, 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 dump_abort __GMP_PROTO ((mpz_t, mpz_t));
- void debug_mp __GMP_PROTO ((mpz_t, int));
- int
- main (int argc, char **argv)
- {
- mpz_t dividend, divisor;
- mpz_t quotient, remainder;
- mpz_t quotient2, remainder2;
- mpz_t temp;
- mp_size_t dividend_size, divisor_size;
- int i;
- int reps = 1000;
- gmp_randstate_ptr rands;
- mpz_t bs;
- unsigned long bsi, size_range;
- tests_start ();
- TESTS_REPS (reps, argv, argc);
- rands = RANDS;
- mpz_init (bs);
- mpz_init (dividend);
- mpz_init (divisor);
- mpz_init (quotient);
- mpz_init (remainder);
- mpz_init (quotient2);
- mpz_init (remainder2);
- mpz_init (temp);
- for (i = 0; i < reps; i++)
- {
- mpz_urandomb (bs, rands, 32);
- size_range = mpz_get_ui (bs) % 18 + 2; /* 0..524288 bit operands */
- do
- {
- mpz_urandomb (bs, rands, size_range);
- divisor_size = mpz_get_ui (bs);
- mpz_rrandomb (divisor, rands, divisor_size);
- }
- while (mpz_sgn (divisor) == 0);
- mpz_urandomb (bs, rands, size_range);
- dividend_size = mpz_get_ui (bs) + divisor_size;
- mpz_rrandomb (dividend, rands, dividend_size);
- mpz_urandomb (bs, rands, 2);
- bsi = mpz_get_ui (bs);
- if ((bsi & 1) != 0)
- mpz_neg (dividend, dividend);
- if ((bsi & 2) != 0)
- mpz_neg (divisor, divisor);
- /* printf ("%ld %ldn", SIZ (dividend), SIZ (divisor)); */
- mpz_tdiv_qr (quotient, remainder, dividend, divisor);
- mpz_tdiv_q (quotient2, dividend, divisor);
- mpz_tdiv_r (remainder2, dividend, divisor);
- /* First determine that the quotients and remainders computed
- with different functions are equal. */
- if (mpz_cmp (quotient, quotient2) != 0)
- dump_abort (dividend, divisor);
- if (mpz_cmp (remainder, remainder2) != 0)
- dump_abort (dividend, divisor);
- /* Check if the sign of the quotient is correct. */
- if (mpz_cmp_ui (quotient, 0) != 0)
- if ((mpz_cmp_ui (quotient, 0) < 0)
- != ((mpz_cmp_ui (dividend, 0) ^ mpz_cmp_ui (divisor, 0)) < 0))
- dump_abort (dividend, divisor);
- /* Check if the remainder has the same sign as the dividend
- (quotient rounded towards 0). */
- if (mpz_cmp_ui (remainder, 0) != 0)
- if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (dividend, 0) < 0))
- dump_abort (dividend, divisor);
- mpz_mul (temp, quotient, divisor);
- mpz_add (temp, temp, remainder);
- if (mpz_cmp (temp, dividend) != 0)
- dump_abort (dividend, divisor);
- mpz_abs (temp, divisor);
- mpz_abs (remainder, remainder);
- if (mpz_cmp (remainder, temp) >= 0)
- dump_abort (dividend, divisor);
- }
- mpz_clear (bs);
- mpz_clear (dividend);
- mpz_clear (divisor);
- mpz_clear (quotient);
- mpz_clear (remainder);
- mpz_clear (quotient2);
- mpz_clear (remainder2);
- mpz_clear (temp);
- tests_end ();
- exit (0);
- }
- void
- dump_abort (mpz_t dividend, mpz_t divisor)
- {
- fprintf (stderr, "ERRORn");
- fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
- fprintf (stderr, "divisor = "); debug_mp (divisor, -16);
- abort();
- }
- void
- debug_mp (mpz_t x, int base)
- {
- mpz_out_str (stderr, base, x); fputc ('n', stderr);
- }