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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/rand/lcg.h Normal file
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#ifndef COSMOPOLITAN_LIBC_LCG_H_
#define COSMOPOLITAN_LIBC_LCG_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
forceinline uint64_t KnuthLinearCongruentialGenerator(uint64_t prev[1]) {
/* Knuth, D.E., "The Art of Computer Programming," Vol 2,
Seminumerical Algorithms, Third Edition, Addison-Wesley, 1998,
p. 106 (line 26) & p. 108 */
prev[0] = prev[0] * 6364136223846793005 + 1442695040888963407;
return prev[0];
}
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_LCG_H_ */