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Merge commit '5121101136cb80151a9361c63dc4822afeb44eef' into thread-next

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Maria Matejka
2023-10-12 14:12:33 +02:00
parent afb9d5d450 5121101136
commit 767b7b22a0
43 changed files with 1076 additions and 158 deletions
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26
lib/birdlib.h
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@@ -239,10 +239,36 @@ asm(
);
#endif
/* Pseudorandom numbers */
u32 random_u32(void);
void random_init(void);
void random_bytes(void *buf, size_t size);
/* Hashing */
/* Constant parameter for non-parametrized hashes */
#define HASH_PARAM 2902958171u
/* Precomputed powers of HASH_PARAM */
#define HASH_PARAM1 ((u64) HASH_PARAM)
#define HASH_PARAM2 (HASH_PARAM1 * HASH_PARAM)
#define HASH_PARAM3 (HASH_PARAM2 * HASH_PARAM)
#define HASH_PARAM4 (HASH_PARAM3 * HASH_PARAM)
/* Reduce intermediate 64-bit value to final 32-bit value */
static inline u32 hash_value(u64 a)
{ return ((u32) a) ^ ((u32) (a >> 32)); }
static inline u64 u32_hash0(u32 v, u32 p, u64 acc)
{ return (acc + v) * p; }
static inline u64 u64_hash0(u64 v, u32 p, u64 acc)
{ return u32_hash0(v >> 32, p, u32_hash0(v, p, acc)); }
static inline u32 u64_hash(u64 v)
{ return hash_value(u64_hash0(v, HASH_PARAM, 0)); }
#endif