| Austin Schuh | bb1338c | 2024-06-15 19:31:16 -0700 | [diff] [blame^] | 1 | /* |
| 2 | |
| 3 | Copyright 2012, 2013 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU MP Library test suite. |
| 6 | |
| 7 | The GNU MP Library test suite is free software; you can redistribute it |
| 8 | and/or modify it under the terms of the GNU General Public License as |
| 9 | published by the Free Software Foundation; either version 3 of the License, |
| 10 | or (at your option) any later version. |
| 11 | |
| 12 | The GNU MP Library test suite is distributed in the hope that it will be |
| 13 | useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
| 15 | Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License along with |
| 18 | the GNU MP Library test suite. If not, see https://www.gnu.org/licenses/. */ |
| 19 | |
| 20 | #include <limits.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <stdio.h> |
| 23 | |
| 24 | #include "testutils.h" |
| 25 | |
| 26 | #define MAXBITS 400 |
| 27 | #define COUNT 10000 |
| 28 | |
| 29 | /* Called when s is supposed to be floor(root(u,z)), and r = u - s^z */ |
| 30 | static int |
| 31 | rootrem_valid_p (const mpz_t u, const mpz_t s, const mpz_t r, unsigned long z) |
| 32 | { |
| 33 | mpz_t t; |
| 34 | |
| 35 | mpz_init (t); |
| 36 | if (mpz_fits_ulong_p (s)) |
| 37 | mpz_ui_pow_ui (t, mpz_get_ui (s), z); |
| 38 | else |
| 39 | mpz_pow_ui (t, s, z); |
| 40 | mpz_sub (t, u, t); |
| 41 | if ((mpz_sgn (t) != mpz_sgn(u) && mpz_sgn (t) != 0) || mpz_cmp (t, r) != 0) |
| 42 | { |
| 43 | mpz_clear (t); |
| 44 | return 0; |
| 45 | } |
| 46 | if (mpz_sgn (s) > 0) |
| 47 | mpz_add_ui (t, s, 1); |
| 48 | else |
| 49 | mpz_sub_ui (t, s, 1); |
| 50 | mpz_pow_ui (t, t, z); |
| 51 | if (mpz_cmpabs (t, u) <= 0) |
| 52 | { |
| 53 | mpz_clear (t); |
| 54 | return 0; |
| 55 | } |
| 56 | |
| 57 | mpz_clear (t); |
| 58 | return 1; |
| 59 | } |
| 60 | |
| 61 | void |
| 62 | testmain (int argc, char **argv) |
| 63 | { |
| 64 | unsigned i; |
| 65 | unsigned long e; |
| 66 | mpz_t u, s, r, bs; |
| 67 | |
| 68 | mpz_init (u); |
| 69 | mpz_init (s); |
| 70 | mpz_init (r); |
| 71 | mpz_init (bs); |
| 72 | |
| 73 | for (i = 0; i < COUNT; i++) |
| 74 | { |
| 75 | mini_rrandomb (u, MAXBITS); |
| 76 | mini_rrandomb (bs, 12); |
| 77 | e = mpz_getlimbn (bs, 0) % mpz_sizeinbase (u, 2) + 1; |
| 78 | if ((e & 1) && (mpz_getlimbn (bs, 0) & (1L<<10))) |
| 79 | mpz_neg (u, u); |
| 80 | mpz_rootrem (s, r, u, e); |
| 81 | |
| 82 | if (!rootrem_valid_p (u, s, r, e)) |
| 83 | { |
| 84 | fprintf (stderr, "mpz_rootrem(%lu-th) failed:\n", e); |
| 85 | dump ("u", u); |
| 86 | dump ("root", s); |
| 87 | dump ("rem", r); |
| 88 | abort (); |
| 89 | } |
| 90 | } |
| 91 | mpz_clear (bs); |
| 92 | mpz_clear (u); |
| 93 | mpz_clear (s); |
| 94 | mpz_clear (r); |
| 95 | } |