/*
  This file is part of ctak.

  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 ctak. If not, see <https://www.gnu.org/licenses/>.
*/

#ifndef XORSHIFT_H
#define XORSHIFT_H

#include <stdint.h>

extern uint64_t xors;

#define XORSHIFT64                                                             \
  {                                                                            \
    xors ^= xors >> 12;                                                        \
    xors ^= xors << 25;                                                        \
    xors ^= xors >> 27;                                                        \
  }

#define RANDOM64 (xors * 0x2545F4914F6CDD1D)
#define RANDOM32 ((uint32_t)(RANDOM64>>32))

static inline uint64_t rand64(void) {
  XORSHIFT64;
  return RANDOM64;
}

static inline uint32_t rand32(void) {
  XORSHIFT64;
  return RANDOM32;
}

#endif