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#include <cstdint>
#include <iostream>
#include <ctime>
#include <stc/crandom.h>
static inline uint64_t rotl64(const uint64_t x, const int k)
{ return (x << k) | (x >> (64 - k)); }
static uint64_t splitmix64_x = 87213627321ull; /* The state can be seeded with any value. */
uint64_t splitmix64(void) {
uint64_t z = (splitmix64_x += 0x9e3779b97f4a7c15);
z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
return z ^ (z >> 31);
}
static void init_state(uint64_t *rng, uint64_t seed) {
splitmix64_x = seed;
for (int i=0; i<4; ++i) rng[i] = splitmix64();
}
/* jsf64 */
static inline uint64_t jsf64(uint64_t *s) {
uint64_t e = s[0] - rotl64(s[1], 7);
s[0] = s[1] ^ rotl64(s[2], 13);
s[1] = s[2] + rotl64(s[3], 37);
s[2] = s[3] + e;
s[3] = e + s[0];
return s[3];
}
/* sfc64 */
static inline uint64_t sfc64(uint64_t *s) {
uint64_t result = s[0] + s[1] + s[3]++;
s[0] = s[1] ^ (s[1] >> 11);
s[1] = s[2] + (s[2] << 3);
s[2] = rotl64(s[2], 24) + result;
return result;
}
/* sfc64 with Weyl increment */
static uint64_t weyl = 1234566789123ull;
static inline uint64_t sfc64w(uint64_t *s) {
uint64_t result = s[0] + s[1] + (s[3] += weyl|1);
s[0] = s[1] ^ (s[1] >> 11);
s[1] = s[2] + (s[2] << 3);
s[2] = rotl64(s[2], 24) + result;
return result;
}
/* xoshiro256** */
static inline uint64_t xoshiro256starstar(uint64_t* s) {
const uint64_t result = rotl64(s[1] * 5, 7) * 9;
const uint64_t t = s[1] << 17;
s[2] ^= s[0];
s[3] ^= s[1];
s[1] ^= s[2];
s[0] ^= s[3];
s[2] ^= t;
s[3] = rotl64(s[3], 45);
return result;
}
inline unsigned long long wyhash64(uint64_t* s) {
*s += 0x60bee2bee120fc15ull;
__uint128_t tmp = (__uint128_t) *s * 0xa3b195354a39b70dull;
unsigned long long m1 = (tmp >> 64) ^ tmp;
tmp = (__uint128_t)m1 * 0x1b03738712fad5c9ull;
return (tmp >> 64) ^ tmp;
}
inline unsigned long long lehmer64(uint64_t* s) {
*(__uint128_t *)s *= 0xda942042e4dd58b5ull;
return *(__uint128_t *)s >> 64;
}
using namespace std;
int main(void)
{
enum {N = 800000000};
uint64_t* recipient = new uint64_t[N];
static stc64_t rng;
init_state(rng.state, 12345123);
cout << "WARMUP" << endl;
for (size_t i = 0; i < N; i++)
recipient[i] = wyhash64(rng.state);
clock_t beg, end;
for (size_t ti = 0; ti < 4; ti++) {
cout << endl << "ROUND " << ti+1 << endl;
beg = clock();
for (size_t i = 0; i < N; i++)
recipient[i] = wyhash64(rng.state);
end = clock();
cout << "wyhash64:\t"
<< (float(end - beg) / CLOCKS_PER_SEC)
<< " s: " << recipient[312] << endl;
beg = clock();
for (size_t i = 0; i < N; i++)
recipient[i] = sfc64w(rng.state);
end = clock();
cout << "sfc64w:\t\t"
<< (float(end - beg) / CLOCKS_PER_SEC)
<< " s: " << recipient[312] << endl;
beg = clock();
for (size_t i = 0; i < N; i++)
recipient[i] = stc64_rand(&rng);
end = clock();
cout << "stc64:\t\t"
<< (float(end - beg) / CLOCKS_PER_SEC)
<< " s: " << recipient[312] << endl;
beg = clock();
for (size_t i = 0; i < N; i++)
recipient[i] = xoshiro256starstar(rng.state);
end = clock();
cout << "xoshiro256**:\t"
<< (float(end - beg) / CLOCKS_PER_SEC)
<< " s: " << recipient[312] << endl;
beg = clock();
for (size_t i = 0; i < N; i++)
recipient[i] = lehmer64(rng.state);
end = clock();
cout << "lehmer64:\t"
<< ((float) end - beg) / CLOCKS_PER_SEC
<< " s: " << recipient[312] << endl;
cout << "Next we do random number computations only, doing no work."
<< endl;
uint64_t s = 0;
beg = clock();
for (size_t i = 0; i < N; i++)
s += wyhash64(rng.state);
end = clock();
cout << "wyhash64:\t"
<< ((float) end - beg) / CLOCKS_PER_SEC
<< " s: " << s << endl;
s = 0;
beg = clock();
for (size_t i = 0; i < N; i++)
s += sfc64w(rng.state);
end = clock();
cout << "sfc64w:\t\t"
<< ((float) end - beg) / CLOCKS_PER_SEC
<< " s: " << s << endl;
s = 0;
beg = clock();
for (size_t i = 0; i < N; i++)
s += stc64_rand(&rng);
end = clock();
cout << "stc64:\t\t"
<< ((float) end - beg) / CLOCKS_PER_SEC
<< " s: " << s << endl;
s = 0;
beg = clock();
for (size_t i = 0; i < N; i++)
s += xoshiro256starstar(rng.state);
end = clock();
cout << "xoshiro256**:\t"
<< ((float) end - beg) / CLOCKS_PER_SEC
<< " s: " << s << endl;
s = 0;
beg = clock();
for (size_t i = 0; i < N; i++)
s += lehmer64(rng.state);
end = clock();
cout << "lehmer64:\t"
<< ((float) end - beg) / CLOCKS_PER_SEC
<< " s: " << s << endl;
}
delete[] recipient;
return 0;
}
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