t-lc2exp.c
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上传日期:2022-08-06
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- /* Exercise the lc2exp random functions.
- Copyright 2002 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"
- /* a=0 and c=0 produces zero results always. */
- void
- check_zero (unsigned long m2exp)
- {
- gmp_randstate_t r;
- mpz_t a;
- unsigned long c;
- int i;
- mpz_init_set_ui (a, 0L);
- c = 0L;
- gmp_randinit_lc_2exp (r, a, c, m2exp);
- gmp_randseed_ui (r, 0L);
- for (i = 0; i < 5; i++)
- {
- mpz_urandomb (a, r, 123L);
- if (mpz_sgn (a) != 0)
- {
- printf ("check_zero m2exp=%lu: didn't get zeron", m2exp);
- gmp_printf (" rand=%#Zxn", a);
- abort ();
- }
- }
- mpz_clear (a);
- gmp_randclear (r);
- }
- /* negative a */
- void
- check_nega (void)
- {
- gmp_randstate_t r;
- mpz_t a;
- unsigned long c, m2exp;
- int i;
- mpz_init (a);
- mpz_setbit (a, 1000L);
- mpz_neg (a, a);
- c = 0L;
- m2exp = 45L;
- gmp_randinit_lc_2exp (r, a, c, m2exp);
- gmp_randseed_ui (r, 0L);
- for (i = 0; i < 5; i++)
- {
- mpz_urandomb (a, r, 123L);
- if (mpz_sgn (a) != 0)
- printf ("check_nega m2exp=%lu: didn't get zeron", m2exp);
- }
- mpz_clear (a);
- gmp_randclear (r);
- }
- void
- check_bigc (void)
- {
- gmp_randstate_t r;
- mpz_t a;
- unsigned long c, m2exp, bits;
- int i;
- mpz_init_set_ui (a, 0L);
- c = ULONG_MAX;
- m2exp = 8;
- gmp_randinit_lc_2exp (r, a, c, m2exp);
- gmp_randseed_ui (r, 0L);
- for (i = 0; i < 20; i++)
- {
- bits = 123L;
- mpz_urandomb (a, r, bits);
- if (mpz_sgn (a) < 0 || mpz_sizeinbase (a, 2) > bits)
- {
- printf ("check_bigc: mpz_urandomb out of rangen");
- printf (" m2exp=%lun", m2exp);
- gmp_printf (" rand=%#ZXn", a);
- gmp_printf (" sizeinbase2=%un", mpz_sizeinbase (a, 2));
- }
- }
- mpz_clear (a);
- gmp_randclear (r);
- }
- void
- check_bigc1 (void)
- {
- gmp_randstate_t r;
- mpz_t a;
- unsigned long c, m2exp;
- int i;
- mpz_init_set_ui (a, 0L);
- c = ULONG_MAX;
- m2exp = 2;
- gmp_randinit_lc_2exp (r, a, c, m2exp);
- gmp_randseed_ui (r, 0L);
- for (i = 0; i < 20; i++)
- {
- mpz_urandomb (a, r, 1L);
- if (mpz_cmp_ui (a, 1L) != 0)
- {
- printf ("check_bigc1: mpz_urandomb didn't give 1n");
- printf (" m2exp=%lun", m2exp);
- gmp_printf (" got rand=%#ZXn", a);
- abort ();
- }
- }
- mpz_clear (a);
- gmp_randclear (r);
- }
- /* Checks parameters which triggered an assertion failure in the past.
- Happened when limbs(a)+limbs(c) < bits_to_limbs(m2exp). */
- void
- check_bigm (void)
- {
- gmp_randstate_t rstate;
- mpz_t a;
- mpz_init_set_ui (a, 5L);
- gmp_randinit_lc_2exp (rstate, a, 1L, 384L);
- mpz_urandomb (a, rstate, 20L);
- gmp_randclear (rstate);
- mpz_clear (a);
- }
- /* Checks for seeds bigger than the modulus. */
- void
- check_bigs (void)
- {
- gmp_randstate_t rstate;
- mpz_t sd, a;
- int i;
- mpz_init (sd);
- mpz_setbit (sd, 300L);
- mpz_sub_ui (sd, sd, 1L);
- mpz_clrbit (sd, 13L);
- mpz_init_set_ui (a, 123456789L);
- gmp_randinit_lc_2exp (rstate, a, 5L, 64L);
- for (i = 0; i < 20; i++)
- {
- mpz_neg (sd, sd);
- gmp_randseed (rstate, sd);
- mpz_mul_ui (sd, sd, 7L);
- mpz_urandomb (a, rstate, 80L);
- }
- gmp_randclear (rstate);
- mpz_clear (a);
- mpz_clear (sd);
- }
- int
- main (void)
- {
- tests_start ();
- check_zero (2L);
- check_zero (7L);
- check_zero (32L);
- check_zero (64L);
- check_zero (1000L);
- check_nega ();
- check_bigc ();
- check_bigc1 ();
- check_bigm ();
- check_bigs ();
- tests_end ();
- exit (0);
- }