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/* Exercise the lc2exp random functions.
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Copyright 2002, 2011 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.h"
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#include "gmp-impl.h"
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#include "tests.h"
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/* a=0 and c=0 produces zero results always. */
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void
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check_zero (unsigned long m2exp)
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{
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gmp_randstate_t r;
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mpz_t a;
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unsigned long c;
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int i;
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mpz_init_set_ui (a, 0L);
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c = 0L;
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gmp_randinit_lc_2exp (r, a, c, m2exp);
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gmp_randseed_ui (r, 0L);
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for (i = 0; i < 5; i++)
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{
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mpz_urandomb (a, r, 123L);
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if (mpz_sgn (a) != 0)
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{
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printf ("check_zero m2exp=%lu: didn't get zero\n", m2exp);
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gmp_printf (" rand=%#Zx\n", a);
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abort ();
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}
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}
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mpz_clear (a);
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gmp_randclear (r);
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}
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/* negative a */
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void
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check_nega (void)
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{
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gmp_randstate_t r;
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mpz_t a;
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unsigned long c, m2exp;
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int i;
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mpz_init (a);
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mpz_setbit (a, 1000L);
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mpz_neg (a, a);
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c = 0L;
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m2exp = 45L;
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gmp_randinit_lc_2exp (r, a, c, m2exp);
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gmp_randseed_ui (r, 0L);
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for (i = 0; i < 5; i++)
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{
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mpz_urandomb (a, r, 123L);
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if (mpz_sgn (a) != 0)
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printf ("check_nega m2exp=%lu: didn't get zero\n", m2exp);
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}
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mpz_clear (a);
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gmp_randclear (r);
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}
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void
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check_bigc (void)
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{
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gmp_randstate_t r;
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mpz_t a;
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unsigned long c, m2exp, bits;
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int i;
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mpz_init_set_ui (a, 0L);
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c = ULONG_MAX;
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m2exp = 8;
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gmp_randinit_lc_2exp (r, a, c, m2exp);
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gmp_randseed_ui (r, 0L);
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for (i = 0; i < 20; i++)
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{
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bits = 123L;
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mpz_urandomb (a, r, bits);
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if (mpz_sgn (a) < 0 || mpz_sizeinbase (a, 2) > bits)
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{
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printf ("check_bigc: mpz_urandomb out of range\n");
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printf (" m2exp=%lu\n", m2exp);
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gmp_printf (" rand=%#ZX\n", a);
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gmp_printf (" sizeinbase2=%u\n", mpz_sizeinbase (a, 2));
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abort ();
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}
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}
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mpz_clear (a);
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gmp_randclear (r);
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}
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void
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check_bigc1 (void)
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{
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gmp_randstate_t r;
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mpz_t a;
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unsigned long c, m2exp;
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int i;
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mpz_init_set_ui (a, 0L);
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c = ULONG_MAX;
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m2exp = 2;
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gmp_randinit_lc_2exp (r, a, c, m2exp);
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gmp_randseed_ui (r, 0L);
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for (i = 0; i < 20; i++)
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{
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mpz_urandomb (a, r, 1L);
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if (mpz_cmp_ui (a, 1L) != 0)
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{
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printf ("check_bigc1: mpz_urandomb didn't give 1\n");
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printf (" m2exp=%lu\n", m2exp);
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gmp_printf (" got rand=%#ZX\n", a);
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abort ();
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}
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}
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mpz_clear (a);
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gmp_randclear (r);
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}
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/* Checks parameters which triggered an assertion failure in the past.
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Happened when limbs(a)+limbs(c) < bits_to_limbs(m2exp). */
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void
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check_bigm (void)
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{
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gmp_randstate_t rstate;
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mpz_t a;
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mpz_init_set_ui (a, 5L);
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gmp_randinit_lc_2exp (rstate, a, 1L, 384L);
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mpz_urandomb (a, rstate, 20L);
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gmp_randclear (rstate);
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mpz_clear (a);
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}
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/* Checks for seeds bigger than the modulus. */
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void
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check_bigs (void)
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{
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gmp_randstate_t rstate;
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mpz_t sd, a;
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int i;
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mpz_init (sd);
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mpz_setbit (sd, 300L);
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mpz_sub_ui (sd, sd, 1L);
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mpz_clrbit (sd, 13L);
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mpz_init_set_ui (a, 123456789L);
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gmp_randinit_lc_2exp (rstate, a, 5L, 64L);
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for (i = 0; i < 20; i++)
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{
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mpz_neg (sd, sd);
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gmp_randseed (rstate, sd);
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mpz_mul_ui (sd, sd, 7L);
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mpz_urandomb (a, rstate, 80L);
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}
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gmp_randclear (rstate);
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mpz_clear (a);
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mpz_clear (sd);
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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_zero (2L);
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check_zero (7L);
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check_zero (32L);
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check_zero (64L);
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check_zero (1000L);
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check_nega ();
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check_bigc ();
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check_bigc1 ();
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check_bigm ();
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check_bigs ();
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tests_end ();
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exit (0);
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}
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