/*
* Simple random number generator for testing.
* Copyright © 2022-2024 Nick Bowler
*
* Directly compare the test lib RNG against the reference implementation.
*
* This program 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.
*
* This program 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 this program. If not, see .
*/
#include
#include "tap.h"
#if !HAVE_FOR_DECLS
int main(void)
{
tap_skip_all("cannot compile reference xoshiro256+");
}
#else
#define TEST_RNG_NO_EXTERNAL_API 1
#include "rng.c"
#include "xos256p.c"
int main(void)
{
unsigned long long seed_state = 0xdeadbeeff00dcafe;
unsigned long long test_result, ref_result;
unsigned long long ref_state[4], test_state[4];
int i, ret = 0;
tap_plan(200);
for (i = 0; i < 100; i++) {
s[0] = ref_state[0] = test_state[0] = splitmix64(&seed_state);
s[1] = ref_state[1] = test_state[1] = splitmix64(&seed_state);
s[2] = ref_state[2] = test_state[2] = splitmix64(&seed_state);
s[3] = ref_state[3] = test_state[3] = splitmix64(&seed_state);
ref_result = next();
test_result = xoshiro256p(test_state);
if (!tap_result(ref_result == test_result, "rng output")) {
tap_diag("Failed, unexpected result");
tap_diag(" with initial state %llx %llx %llx %llx",
ref_state[0], ref_state[1],
ref_state[2], ref_state[3]);
tap_diag(" received: %llx", test_result);
tap_diag(" expected: %llx", ref_result);
}
if (!tap_result(s[0] == test_state[0] && s[1] == test_state[1]
&& s[2] == test_state[2] && s[3] == test_state[3],
"rng state update"))
{
tap_diag("Failed, state update differed");
tap_diag(" with initial state %llx %llx %llx %llx",
ref_state[0], ref_state[1],
ref_state[2], ref_state[3]);
tap_diag(" received: %llx %llx %llx %llx",
test_state[0], test_state[1],
test_state[2], test_state[3]);
tap_diag(" expected: %llx %llx %llx %llx",
(unsigned long long)s[0],
(unsigned long long)s[1],
(unsigned long long)s[2],
(unsigned long long)s[3]);
}
}
tap_done();
}
#endif