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/* Test mpz_remove.
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Copyright 1991, 1993, 1994, 1996, 1997, 2000, 2001, 2009, 2012, 2013 Free
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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.h"
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#include "gmp-impl.h"
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#include "tests.h"
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void debug_mp (mpz_t);
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unsigned long int mpz_refremove (mpz_t, const mpz_t, const mpz_t);
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int
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main (int argc, char **argv)
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{
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unsigned long int exp;
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mpz_t t, dest, refdest, dividend, divisor;
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mp_size_t dividend_size, divisor_size;
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int i;
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int reps = 1000;
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unsigned long int pwr, refpwr;
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gmp_randstate_ptr rands;
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mpz_t bs;
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unsigned long size_range;
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tests_start ();
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rands = RANDS;
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if (argc == 2)
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reps = atoi (argv[1]);
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mpz_inits (bs, t, dest, refdest, dividend, divisor, NULL);
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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) % 18 + 1; /* 1..524288 bit operands */
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do
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{
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mpz_urandomb (bs, rands, size_range);
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divisor_size = mpz_get_ui (bs);
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mpz_rrandomb (divisor, rands, divisor_size);
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}
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while (mpz_sgn (divisor) == 0);
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mpz_urandomb (bs, rands, size_range);
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dividend_size = mpz_get_ui (bs) + divisor_size;
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mpz_rrandomb (dividend, rands, dividend_size);
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mpz_urandomb (bs, rands, 32);
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exp = mpz_get_ui (bs) % (5 + 10000 / mpz_sizeinbase (divisor, 2));
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if (mpz_get_ui (bs) & 2)
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mpz_neg (divisor, divisor);
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mpz_pow_ui (t, divisor, exp);
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mpz_mul (dividend, dividend, t);
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refpwr = mpz_refremove (refdest, dividend, divisor);
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pwr = mpz_remove (dest, dividend, divisor);
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if (refpwr != pwr || mpz_cmp (refdest, dest) != 0)
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{
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fprintf (stderr, "ERROR after %d tests\n", i);
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fprintf (stderr, "refpower = %lu\n", refpwr);
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fprintf (stderr, " power = %lu\n", pwr);
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fprintf (stderr, " op1 = "); debug_mp (dividend);
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fprintf (stderr, " op2 = "); debug_mp (divisor);
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fprintf (stderr, "refdest = "); debug_mp (refdest);
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fprintf (stderr, " dest = "); debug_mp (dest);
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abort ();
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}
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}
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mpz_clears (bs, t, dest, refdest, dividend, divisor, NULL);
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tests_end ();
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exit (0);
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}
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unsigned long int
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mpz_refremove (mpz_t dest, const mpz_t src, const mpz_t f)
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{
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unsigned long int pwr;
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pwr = 0;
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mpz_set (dest, src);
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if (mpz_cmpabs_ui (f, 1) > 0)
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{
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mpz_t rem, x;
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mpz_init (x);
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mpz_init (rem);
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for (;; pwr++)
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{
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mpz_tdiv_qr (x, rem, dest, f);
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if (mpz_cmp_ui (rem, 0) != 0)
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break;
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mpz_swap (dest, x);
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}
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mpz_clear (x);
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mpz_clear (rem);
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}
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return pwr;
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}
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void
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debug_mp (mpz_t x)
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{
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size_t siz = mpz_sizeinbase (x, 16);
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if (siz > 65)
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{
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mpz_t q;
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mpz_init (q);
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mpz_tdiv_q_2exp (q, x, 4 * (mpz_sizeinbase (x, 16) - 25));
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gmp_fprintf (stderr, "%ZX...", q);
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mpz_tdiv_r_2exp (q, x, 4 * 25);
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gmp_fprintf (stderr, "%025ZX [%d]\n", q, (int) siz);
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mpz_clear (q);
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}
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else
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{
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gmp_fprintf (stderr, "%ZX\n", x);
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}
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}
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