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91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
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#ifndef _CRUSH_HASH_H
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#define _CRUSH_HASH_H
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/*
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* Robert Jenkins' function for mixing 32-bit values
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* http://burtleburtle.net/bob/hash/evahash.html
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* a, b = random bits, c = input and output
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*/
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#define crush_hashmix(a, b, c) do { \
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a = a-b; a = a-c; a = a^(c>>13); \
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b = b-c; b = b-a; b = b^(a<<8); \
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c = c-a; c = c-b; c = c^(b>>13); \
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a = a-b; a = a-c; a = a^(c>>12); \
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b = b-c; b = b-a; b = b^(a<<16); \
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c = c-a; c = c-b; c = c^(b>>5); \
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a = a-b; a = a-c; a = a^(c>>3); \
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b = b-c; b = b-a; b = b^(a<<10); \
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c = c-a; c = c-b; c = c^(b>>15); \
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} while (0)
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#define crush_hash_seed 1315423911
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static inline __u32 crush_hash32(__u32 a)
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{
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__u32 hash = crush_hash_seed ^ a;
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__u32 b = a;
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__u32 x = 231232;
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__u32 y = 1232;
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crush_hashmix(b, x, hash);
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crush_hashmix(y, a, hash);
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return hash;
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}
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static inline __u32 crush_hash32_2(__u32 a, __u32 b)
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{
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__u32 hash = crush_hash_seed ^ a ^ b;
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__u32 x = 231232;
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__u32 y = 1232;
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crush_hashmix(a, b, hash);
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crush_hashmix(x, a, hash);
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crush_hashmix(b, y, hash);
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return hash;
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}
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static inline __u32 crush_hash32_3(__u32 a, __u32 b, __u32 c)
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{
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__u32 hash = crush_hash_seed ^ a ^ b ^ c;
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__u32 x = 231232;
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__u32 y = 1232;
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crush_hashmix(a, b, hash);
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crush_hashmix(c, x, hash);
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crush_hashmix(y, a, hash);
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crush_hashmix(b, x, hash);
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crush_hashmix(y, c, hash);
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return hash;
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}
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static inline __u32 crush_hash32_4(__u32 a, __u32 b, __u32 c,
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__u32 d)
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{
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__u32 hash = crush_hash_seed ^ a ^ b ^ c ^ d;
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__u32 x = 231232;
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__u32 y = 1232;
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crush_hashmix(a, b, hash);
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crush_hashmix(c, d, hash);
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crush_hashmix(a, x, hash);
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crush_hashmix(y, b, hash);
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crush_hashmix(c, x, hash);
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crush_hashmix(y, d, hash);
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return hash;
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}
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static inline __u32 crush_hash32_5(__u32 a, __u32 b, __u32 c,
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__u32 d, __u32 e)
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{
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__u32 hash = crush_hash_seed ^ a ^ b ^ c ^ d ^ e;
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__u32 x = 231232;
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__u32 y = 1232;
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crush_hashmix(a, b, hash);
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crush_hashmix(c, d, hash);
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crush_hashmix(e, x, hash);
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crush_hashmix(y, a, hash);
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crush_hashmix(b, x, hash);
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crush_hashmix(y, c, hash);
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crush_hashmix(d, x, hash);
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crush_hashmix(y, e, hash);
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return hash;
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}
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#endif
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