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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/rand/xorshift.h Normal file
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#ifndef COSMOPOLITAN_LIBC_RAND_XORSHIFT_H_
#define COSMOPOLITAN_LIBC_RAND_XORSHIFT_H_
#define kMarsagliaXorshift64Seed 88172645463325252
#define kMarsagliaXorshift32Seed 2463534242
#if !(__ASSEMBLER__ + __LINKER__ + 0)
forceinline uint64_t MarsagliaXorshift64(uint64_t state[hasatleast 1]) {
uint64_t x = state[0];
x ^= x << 13;
x ^= x >> 7;
x ^= x << 17;
state[0] = x;
return x;
}
forceinline uint32_t MarsagliaXorshift32(uint32_t state[hasatleast 1]) {
uint32_t x = state[0];
x ^= x << 13;
x ^= x >> 17;
x ^= x << 5;
state[0] = x;
return x;
}
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_RAND_XORSHIFT_H_ */