2 * Simple random number generator for testing.
3 * Copyright © 2022 Nick Bowler
5 * Directly compare the test lib RNG against the reference implementation.
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
29 unsigned long long seed_state = 0xdeadbeeff00dcafe;
30 unsigned long long test_result, ref_result;
31 unsigned long long ref_state[4], test_state[4];
35 for (i = 0; i < 100; i++) {
36 s[0] = ref_state[0] = test_state[0] = splitmix64(&seed_state);
37 s[1] = ref_state[1] = test_state[1] = splitmix64(&seed_state);
38 s[2] = ref_state[2] = test_state[2] = splitmix64(&seed_state);
39 s[3] = ref_state[3] = test_state[3] = splitmix64(&seed_state);
42 test_result = xoshiro256p(test_state);
44 if (ref_result != test_result) {
45 printf("not ok %d rng output\n", 2*i+1);
46 printf("# Failed, unexpected result\n");
47 printf("# with initial state %llx %llx %llx %llx\n",
48 ref_state[0], ref_state[1],
49 ref_state[2], ref_state[3]);
50 printf("# received: %llx\n", test_result);
51 printf("# expected: %llx\n", ref_result);
54 printf("ok %d rng output\n", 2*i+1);
57 if (s[0] != test_state[0] || s[1] != test_state[1]
58 || s[2] != test_state[2] || s[3] != test_state[3])
60 printf("not ok %d rng state update\n", 2*i+2);
61 printf("# Failed, state update differed\n");
62 printf("# with initial state %llx %llx %llx %llx\n",
63 ref_state[0], ref_state[1],
64 ref_state[2], ref_state[3]);
65 printf("# received: %llx %llx %llx %llx\n",
66 test_state[0], test_state[1],
67 test_state[2], test_state[3]);
68 printf("# expected: %llx %llx %llx %llx\n",
69 (unsigned long long)s[0],
70 (unsigned long long)s[1],
71 (unsigned long long)s[2],
72 (unsigned long long)s[3]);
75 printf("ok %d rng state update\n", 2*i+2);