159 lines
4.6 KiB
C
159 lines
4.6 KiB
C
/* Test mpz_abs, mpz_add, mpz_cmp, mpz_cmp_ui, mpz_tdiv_qr_ui, mpz_tdiv_q_ui,
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mpz_tdiv_r_ui, mpz_tdiv_ui, mpz_mul_ui.
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Copyright 1993, 1994, 1996, 2000-2002 Free Software Foundation, Inc.
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This file is part of the GNU MP Library test suite.
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The GNU MP Library test suite is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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The GNU MP Library test suite is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along with
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the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "gmp-impl.h"
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#include "tests.h"
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void dump_abort (const char *, mpz_t, unsigned long);
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void debug_mp (mpz_t, int);
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int
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main (int argc, char **argv)
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{
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mpz_t dividend;
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mpz_t quotient, remainder;
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mpz_t quotient2, remainder2;
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mpz_t temp;
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mp_size_t dividend_size;
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unsigned long divisor;
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int i;
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int reps = 200000;
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gmp_randstate_ptr rands;
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mpz_t bs;
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unsigned long bsi, size_range;
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unsigned long r_rq, r_q, r_r, r;
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tests_start ();
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rands = RANDS;
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mpz_init (bs);
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if (argc == 2)
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reps = atoi (argv[1]);
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mpz_init (dividend);
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mpz_init (quotient);
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mpz_init (remainder);
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mpz_init (quotient2);
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mpz_init (remainder2);
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mpz_init (temp);
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for (i = 0; i < reps; i++)
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{
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mpz_urandomb (bs, rands, 32);
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size_range = mpz_get_ui (bs) % 10 + 2; /* 0..2047 bit operands */
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do
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{
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mpz_rrandomb (bs, rands, 64);
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divisor = mpz_get_ui (bs);
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}
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while (divisor == 0);
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mpz_urandomb (bs, rands, size_range);
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dividend_size = mpz_get_ui (bs);
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mpz_rrandomb (dividend, rands, dividend_size);
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mpz_urandomb (bs, rands, 2);
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bsi = mpz_get_ui (bs);
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if ((bsi & 1) != 0)
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mpz_neg (dividend, dividend);
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/* printf ("%ld\n", SIZ (dividend)); */
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r_rq = mpz_tdiv_qr_ui (quotient, remainder, dividend, divisor);
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r_q = mpz_tdiv_q_ui (quotient2, dividend, divisor);
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r_r = mpz_tdiv_r_ui (remainder2, dividend, divisor);
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r = mpz_tdiv_ui (dividend, divisor);
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/* First determine that the quotients and remainders computed
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with different functions are equal. */
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if (mpz_cmp (quotient, quotient2) != 0)
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dump_abort ("quotients from mpz_tdiv_qr_ui and mpz_tdiv_q_ui differ",
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dividend, divisor);
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if (mpz_cmp (remainder, remainder2) != 0)
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dump_abort ("remainders from mpz_tdiv_qr_ui and mpz_tdiv_r_ui differ",
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dividend, divisor);
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/* Check if the sign of the quotient is correct. */
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if (mpz_cmp_ui (quotient, 0) != 0)
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if ((mpz_cmp_ui (quotient, 0) < 0)
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!= (mpz_cmp_ui (dividend, 0) < 0))
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dump_abort ("quotient sign wrong", dividend, divisor);
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/* Check if the remainder has the same sign as the dividend
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(quotient rounded towards 0). */
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if (mpz_cmp_ui (remainder, 0) != 0)
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if ((mpz_cmp_ui (remainder, 0) < 0) != (mpz_cmp_ui (dividend, 0) < 0))
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dump_abort ("remainder sign wrong", dividend, divisor);
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mpz_mul_ui (temp, quotient, divisor);
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mpz_add (temp, temp, remainder);
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if (mpz_cmp (temp, dividend) != 0)
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dump_abort ("n mod d != n - [n/d]*d", dividend, divisor);
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mpz_abs (remainder, remainder);
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if (mpz_cmp_ui (remainder, divisor) >= 0)
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dump_abort ("remainder greater than divisor", dividend, divisor);
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if (mpz_cmp_ui (remainder, r_rq) != 0)
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dump_abort ("remainder returned from mpz_tdiv_qr_ui is wrong",
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dividend, divisor);
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if (mpz_cmp_ui (remainder, r_q) != 0)
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dump_abort ("remainder returned from mpz_tdiv_q_ui is wrong",
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dividend, divisor);
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if (mpz_cmp_ui (remainder, r_r) != 0)
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dump_abort ("remainder returned from mpz_tdiv_r_ui is wrong",
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dividend, divisor);
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if (mpz_cmp_ui (remainder, r) != 0)
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dump_abort ("remainder returned from mpz_tdiv_ui is wrong",
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dividend, divisor);
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}
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mpz_clear (bs);
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mpz_clear (dividend);
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mpz_clear (quotient);
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mpz_clear (remainder);
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mpz_clear (quotient2);
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mpz_clear (remainder2);
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mpz_clear (temp);
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tests_end ();
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exit (0);
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}
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void
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dump_abort (const char *str, mpz_t dividend, unsigned long divisor)
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{
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fprintf (stderr, "ERROR: %s\n", str);
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fprintf (stderr, "dividend = "); debug_mp (dividend, -16);
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fprintf (stderr, "divisor = %lX\n", divisor);
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abort();
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}
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void
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debug_mp (mpz_t x, int base)
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{
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mpz_out_str (stderr, base, x); fputc ('\n', stderr);
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}
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