// *Really* minimal PCG32 code / (c) 2014 M.E. O'Neill / pcg-random.org
// Licensed under Apache License 2.0 (NO WARRANTY, etc. see website)

# include "pcg_minimal.h"

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));
}