#author("2025-04-11T12:22:31+00:00","default:yoya","yoya")
#author("2025-04-11T12:23:09+00:00","default:yoya","yoya")
[[Random]] > [[PermutedCongruentialGenerator]]

- https://ja.wikipedia.org/wiki/Permuted_congruential_generator


- Minimal C Implementation
--  https://www.pcg-random.org/download.html

 // *Really* minimal PCG32 code / (c) 2014 M.E. O'Neill / pcg-random.org
 // Licensed under Apache License 2.0 (NO WARRANTY, etc. see website)
 
 typedef struct { uint64_t state;  uint64_t inc; } pcg32_random_t;
 
 uint32_t pcg32_random_r(pcg32_random_t* rng)
 {
     uint64_t oldstate = rng->state;
     // Advance internal state
     rng->state = oldstate * 6364136223846793005ULL + (rng->inc|1);
     // Calculate output function (XSH RR), uses old state for max ILP
     uint32_t xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
     uint32_t rot = oldstate >> 59u;
     return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
 }