diff options
Diffstat (limited to 'gmp/tests/mpz/t-cong_2exp.c')
| -rw-r--r-- | gmp/tests/mpz/t-cong_2exp.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/gmp/tests/mpz/t-cong_2exp.c b/gmp/tests/mpz/t-cong_2exp.c new file mode 100644 index 0000000000..3ccb5aab04 --- /dev/null +++ b/gmp/tests/mpz/t-cong_2exp.c @@ -0,0 +1,209 @@ +/* test mpz_congruent_2exp_p */ + +/* +Copyright 2001, 2013 Free Software Foundation, Inc. + +This file is part of the GNU MP Library test suite. + +The GNU MP Library test suite is free software; you can redistribute it +and/or modify it under the terms of the GNU 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 test suite 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 General +Public License for more details. + +You should have received a copy of the GNU General Public License along with +the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */ + +#include <stdio.h> +#include <stdlib.h> +#include "gmp.h" +#include "gmp-impl.h" +#include "tests.h" + + +void +check_one (mpz_srcptr a, mpz_srcptr c, unsigned long d, int want) +{ + mpz_t diff, d2exp; + int got; + int swap; + + for (swap = 0; swap <= 1; swap++) + { + got = (mpz_congruent_2exp_p (a, c, d) != 0); + if (want != got) + { + mpz_init (diff); + mpz_init (d2exp); + + mpz_sub (diff, a, c); + mpz_set_ui (d2exp, 1L); + mpz_mul_2exp (d2exp, d2exp, d); + + printf ("mpz_congruent_2exp_p wrong\n"); + printf (" expected %d got %d\n", want, got); + mpz_trace (" a", a); + mpz_trace (" c", c); + mpz_trace (" a-c", diff); + mpz_trace (" 2^d", d2exp); + printf (" d=%lu\n", d); + + mp_trace_base = -16; + mpz_trace (" a", a); + mpz_trace (" c", c); + mpz_trace (" a-c", diff); + mpz_trace (" 2^d", d2exp); + printf (" d=0x%lX\n", d); + abort (); + } + + MPZ_SRCPTR_SWAP (a, c); + } +} + + +void +check_data (void) +{ + static const struct { + const char *a; + const char *c; + unsigned long d; + int want; + + } data[] = { + + /* anything is congruent mod 1 */ + { "0", "0", 0, 1 }, + { "1", "0", 0, 1 }, + { "0", "1", 0, 1 }, + { "123", "-456", 0, 1 }, + { "0x123456789123456789", "0x987654321987654321", 0, 1 }, + { "0xfffffffffffffffffffffffffffffff7", "-0x9", 129, 0 }, + { "0xfffffffffffffffffffffffffffffff6", "-0xa", 128, 1 }, + + }; + + mpz_t a, c; + int i; + + mpz_init (a); + mpz_init (c); + + for (i = 0; i < numberof (data); i++) + { + mpz_set_str_or_abort (a, data[i].a, 0); + mpz_set_str_or_abort (c, data[i].c, 0); + check_one (a, c, data[i].d, data[i].want); + } + + mpz_clear (a); + mpz_clear (c); +} + + +void +check_random (int reps) +{ + gmp_randstate_ptr rands = RANDS; + unsigned long d; + mpz_t a, c, ra, rc; + int i; + + mpz_init (a); + mpz_init (c); + mpz_init (ra); + mpz_init (rc); + + for (i = 0; i < reps; i++) + { + mpz_errandomb (a, rands, 8*GMP_LIMB_BITS); + mpz_errandomb (c, rands, 8*GMP_LIMB_BITS); + d = urandom() % (8*GMP_LIMB_BITS); + + mpz_mul_2exp (a, a, urandom() % (2*GMP_LIMB_BITS)); + mpz_mul_2exp (c, c, urandom() % (2*GMP_LIMB_BITS)); + + mpz_negrandom (a, rands); + mpz_negrandom (c, rands); + + mpz_fdiv_r_2exp (ra, a, d); + mpz_fdiv_r_2exp (rc, c, d); + + mpz_sub (ra, ra, rc); + if (mpz_cmp_ui (ra, 0) != 0) + { + check_one (a, c, d, 0); + mpz_sub (a, a, ra); + } + check_one (a, c, d, 1); + if (d != 0) + { + mpz_combit (a, urandom() % d); + check_one (a, c, d, 0); + } + } + + mpz_clear (a); + mpz_clear (c); + mpz_clear (ra); + mpz_clear (rc); +} + +void +check_random_bits (int reps) +{ + gmp_randstate_ptr rands = RANDS; + mp_bitcnt_t ea, ec, en, d; + mp_bitcnt_t m = 10 * GMP_LIMB_BITS; + mpz_t a, c; + int i; + + mpz_init2 (a, m + 1); + mpz_init2 (c, m); + + for (i = 0; i < reps; i++) + { + d = urandom() % m; + ea = urandom() % m; + ec = urandom() % m; + en = urandom() % m; + + mpz_set_ui (c, 0); + mpz_setbit (c, en); + + mpz_set_ui (a, 0); + mpz_setbit (a, ec); + mpz_sub (c , a, c); + + mpz_set_ui (a, 0); + mpz_setbit (a, ea); + mpz_add (a , a, c); + + check_one (a, c, d, ea >= d); + } + + mpz_clear (a); + mpz_clear (c); +} + + +int +main (int argc, char *argv[]) +{ + int reps = 5000; + + tests_start (); + TESTS_REPS (reps, argv, argc); + + check_data (); + check_random (reps); + check_random_bits (reps); + + tests_end (); + exit (0); +} |