murmurhash3.c (36a1818f5a1e50b805317ba13f827067d50f6970) murmurhash3.c (d7e1201443713f5addce2d9b4920d25391883a80)
1// SPDX-License-Identifier: LGPL-2.1+
2/*
3 * MurmurHash3 was written by Austin Appleby, and is placed in the public
4 * domain. The author hereby disclaims copyright to this source code.
5 *
6 * Adapted by John Wiele (jwiele@redhat.com).
7 */
8
9#include "murmurhash3.h"
10
1// SPDX-License-Identifier: LGPL-2.1+
2/*
3 * MurmurHash3 was written by Austin Appleby, and is placed in the public
4 * domain. The author hereby disclaims copyright to this source code.
5 *
6 * Adapted by John Wiele (jwiele@redhat.com).
7 */
8
9#include "murmurhash3.h"
10
11#include <asm/unaligned.h>
12
11static inline u64 rotl64(u64 x, s8 r)
12{
13 return (x << r) | (x >> (64 - r));
14}
15
16#define ROTL64(x, y) rotl64(x, y)
13static inline u64 rotl64(u64 x, s8 r)
14{
15 return (x << r) | (x >> (64 - r));
16}
17
18#define ROTL64(x, y) rotl64(x, y)
17static __always_inline u64 getblock64(const u64 *p, int i)
18{
19#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
20 return p[i];
21#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
22 return __builtin_bswap64(p[i]);
23#else
24#error "can't figure out byte order"
25#endif
26}
27
19
28static __always_inline void putblock64(u64 *p, int i, u64 value)
29{
30#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
31 p[i] = value;
32#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
33 p[i] = __builtin_bswap64(value);
34#else
35#error "can't figure out byte order"
36#endif
37}
38
39/* Finalization mix - force all bits of a hash block to avalanche */
40
41static __always_inline u64 fmix64(u64 k)
42{
43 k ^= k >> 33;
44 k *= 0xff51afd7ed558ccdLLU;
45 k ^= k >> 33;
46 k *= 0xc4ceb9fe1a85ec53LLU;

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55 const int nblocks = len / 16;
56
57 u64 h1 = seed;
58 u64 h2 = seed;
59
60 const u64 c1 = 0x87c37b91114253d5LLU;
61 const u64 c2 = 0x4cf5ad432745937fLLU;
62
20/* Finalization mix - force all bits of a hash block to avalanche */
21
22static __always_inline u64 fmix64(u64 k)
23{
24 k ^= k >> 33;
25 k *= 0xff51afd7ed558ccdLLU;
26 k ^= k >> 33;
27 k *= 0xc4ceb9fe1a85ec53LLU;

--- 8 unchanged lines hidden (view full) ---

36 const int nblocks = len / 16;
37
38 u64 h1 = seed;
39 u64 h2 = seed;
40
41 const u64 c1 = 0x87c37b91114253d5LLU;
42 const u64 c2 = 0x4cf5ad432745937fLLU;
43
44 u64 *hash_out = out;
45
63 /* body */
64
65 const u64 *blocks = (const u64 *)(data);
66
67 int i;
68
69 for (i = 0; i < nblocks; i++) {
46 /* body */
47
48 const u64 *blocks = (const u64 *)(data);
49
50 int i;
51
52 for (i = 0; i < nblocks; i++) {
70 u64 k1 = getblock64(blocks, i * 2 + 0);
71 u64 k2 = getblock64(blocks, i * 2 + 1);
53 u64 k1 = get_unaligned_le64(&blocks[i * 2]);
54 u64 k2 = get_unaligned_le64(&blocks[i * 2 + 1]);
72
73 k1 *= c1;
74 k1 = ROTL64(k1, 31);
75 k1 *= c2;
76 h1 ^= k1;
77
78 h1 = ROTL64(h1, 27);
79 h1 += h2;

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165 h2 += h1;
166
167 h1 = fmix64(h1);
168 h2 = fmix64(h2);
169
170 h1 += h2;
171 h2 += h1;
172
55
56 k1 *= c1;
57 k1 = ROTL64(k1, 31);
58 k1 *= c2;
59 h1 ^= k1;
60
61 h1 = ROTL64(h1, 27);
62 h1 += h2;

--- 85 unchanged lines hidden (view full) ---

148 h2 += h1;
149
150 h1 = fmix64(h1);
151 h2 = fmix64(h2);
152
153 h1 += h2;
154 h2 += h1;
155
173 putblock64((u64 *)out, 0, h1);
174 putblock64((u64 *)out, 1, h2);
156 put_unaligned_le64(h1, &hash_out[0]);
157 put_unaligned_le64(h2, &hash_out[1]);
175}
158}