t/rng-test.c

   1 /*
   2  * Test case for xoshiro256** implementation.
   3  * Copyright © 2022 Nick Bowler
   4  *
   5  * Directly compare the game RNG against the reference implementation.
   6  *
   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.
  11  *
  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.
  16  *
  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/>.
  19  */
  20
  21 #include <config.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24
  25 #include "game.c"
  26 #include "xos256ss.c"
  27
  28 int main(void)
  29 {
  30         unsigned long long seed_state = 0xdeadbeeff00dcafe;
  31         unsigned long long test_result, ref_result;
  32         unsigned long long ref_state[4], test_state[4];
  33         int i, ret = 0;
  34
  35         printf("1..200\n");
  36         for (i = 0; i < 100; i++) {
  37                 s[0] = ref_state[0] = test_state[0] = splitmix64(&seed_state);
  38                 s[1] = ref_state[1] = test_state[1] = splitmix64(&seed_state);
  39                 s[2] = ref_state[2] = test_state[2] = splitmix64(&seed_state);
  40                 s[3] = ref_state[3] = test_state[3] = splitmix64(&seed_state);
  41
  42                 ref_result = next();
  43                 test_result = xoshiro256ss(test_state);
  44
  45                 if (ref_result != test_result) {
  46                         printf("not ok %d rng output\n", 2*i+1);
  47                         printf("# Failed, unexpected result\n");
  48                         printf("#   with initial state %llx %llx %llx %llx\n",
  49                                ref_state[0], ref_state[1],
  50                                ref_state[2], ref_state[3]);
  51                         printf("#   received: %llx\n", test_result);
  52                         printf("#   expected: %llx\n", ref_result);
  53                         ret = EXIT_FAILURE;
  54                 } else {
  55                         printf("ok %d rng output\n", 2*i+1);
  56                 }
  57
  58                 if (s[0] != test_state[0] || s[1] != test_state[1]
  59                     || s[2] != test_state[2] || s[3] != test_state[3])
  60                 {
  61                         printf("not ok %d rng state update\n", 2*i+2);
  62                         printf("# Failed, state update differed\n");
  63                         printf("#   with initial state %llx %llx %llx %llx\n",
  64                                ref_state[0], ref_state[1],
  65                                ref_state[2], ref_state[3]);
  66                         printf("#   received: %llx %llx %llx %llx\n",
  67                                test_state[0], test_state[1],
  68                                test_state[2], test_state[3]);
  69                         printf("#   expected: %llx %llx %llx %llx\n",
  70                                (unsigned long long)s[0],
  71                                (unsigned long long)s[1],
  72                                (unsigned long long)s[2],
  73                                (unsigned long long)s[3]);
  74                         ret = EXIT_FAILURE;
  75                 } else {
  76                         printf("ok %d rng state update\n", 2*i+2);
  77                 }
  78         }
  79
  80         return ret;
  81 }