wbase 0.1.4

Cacheline-safe storage primitives: 48-bit log addressing, sector alignment, backoff, varint / 缓存行安全存储原语：48 位日志寻址、扇区对齐、退避、变长整型
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228

/// garnet/libs/common/HashUtils.cs:fmix64
#[inline]
fn fmix64(mut k: u64) -> u64 {
  k ^= k >> 33;
  k = k.wrapping_mul(0xff51afd7ed558ccd);
  k ^= k >> 33;
  k = k.wrapping_mul(0xc4ceb9fe1a85ec53);
  k ^= k >> 33;
  k
}

/// garnet/libs/common/HashUtils.cs:MurmurHash3x64A
#[inline]
pub fn murmur_hash3_x64_a(b_string: &[u8], seed: u32) -> u64 {
  let mut h1 = seed as u64;
  let c1: u64 = 0x87c37b91114253d5;
  let c2: u64 = 0x4cf5ad432745937f;
  let mut k1: u64;

  let len = b_string.len();

  // 8 字节整块：as_chunks 消除索引边界检查，剩余尾部一次性给出
  let (blocks, suffix) = b_string.as_chunks::<8>();
  for block in blocks {
    k1 = u64::from_le_bytes(*block);

    k1 = k1.wrapping_mul(c1);
    k1 = k1.rotate_left(31);
    k1 = k1.wrapping_mul(c2);
    h1 ^= k1;
    h1 = h1.rotate_left(27);
    h1 = h1.wrapping_add(k1);
    h1 = h1.wrapping_mul(5).wrapping_add(0x52dce729);
  }

  let suffix_len = suffix.len();
  k1 = 0;

  if suffix_len >= 7 {
    k1 ^= (suffix[6] as u64) << 48;
  }
  if suffix_len >= 6 {
    k1 ^= (suffix[5] as u64) << 40;
  }
  if suffix_len >= 5 {
    k1 ^= (suffix[4] as u64) << 32;
  }
  if suffix_len >= 4 {
    k1 ^= (suffix[3] as u64) << 24;
  }
  if suffix_len >= 3 {
    k1 ^= (suffix[2] as u64) << 16;
  }
  if suffix_len >= 2 {
    k1 ^= (suffix[1] as u64) << 8;
  }
  if suffix_len >= 1 {
    k1 ^= suffix[0] as u64;
    k1 = k1.wrapping_mul(c1);
    k1 = k1.rotate_left(31);
    k1 = k1.wrapping_mul(c2);
    h1 ^= k1;
  }

  h1 ^= len as u64;
  fmix64(h1)
}

/// garnet/libs/common/HashUtils.cs:MurmurHash3x128
#[inline]
pub fn murmur_hash3_x128(b_string: &[u8], seed: u32) -> (u64, u64) {
  let mut h1 = seed as u64;
  let mut h2 = seed as u64;

  let c1: u64 = 0x87c37b91114253d5;
  let c2: u64 = 0x4cf5ad432745937f;

  let mut k1: u64;
  let mut k2: u64;

  let len = b_string.len();

  // 16 字节整块：as_chunks 消除索引边界检查，剩余尾部一次性给出
  let (blocks, suffix) = b_string.as_chunks::<16>();
  for block in blocks {
    // SAFETY: 块长恒为 16 字节，前后两个 8 字节半块读取恒在界内，零边界检查
    k1 = unsafe { (block.as_ptr() as *const u64).read_unaligned() };
    k2 = unsafe { (block.as_ptr().add(8) as *const u64).read_unaligned() };

    k1 = k1.wrapping_mul(c1);
    k1 = k1.rotate_left(31);
    k1 = k1.wrapping_mul(c2);
    h1 ^= k1;
    h1 = h1.rotate_left(27);
    h1 = h1.wrapping_add(h2);
    h1 = h1.wrapping_mul(5).wrapping_add(0x52dce729);

    k2 = k2.wrapping_mul(c2);
    k2 = k2.rotate_left(33);
    k2 = k2.wrapping_mul(c1);
    h2 ^= k2;
    h2 = h2.rotate_left(31);
    h2 = h2.wrapping_add(h1);
    h2 = h2.wrapping_mul(5).wrapping_add(0x38495ab5);
  }

  let suffix_len = suffix.len();
  k1 = 0;
  k2 = 0;

  if suffix_len >= 15 {
    k2 ^= (suffix[14] as u64) << 48;
  }
  if suffix_len >= 14 {
    k2 ^= (suffix[13] as u64) << 40;
  }
  if suffix_len >= 13 {
    k2 ^= (suffix[12] as u64) << 32;
  }
  if suffix_len >= 12 {
    k2 ^= (suffix[11] as u64) << 24;
  }
  if suffix_len >= 11 {
    k2 ^= (suffix[10] as u64) << 16;
  }
  if suffix_len >= 10 {
    k2 ^= (suffix[9] as u64) << 8;
  }
  if suffix_len >= 9 {
    k2 ^= suffix[8] as u64;
    k2 = k2.wrapping_mul(c2);
    k2 = k2.rotate_left(33);
    k2 = k2.wrapping_mul(c1);
    h2 ^= k2;
  }

  if suffix_len >= 8 {
    k1 ^= (suffix[7] as u64) << 56;
  }
  if suffix_len >= 7 {
    k1 ^= (suffix[6] as u64) << 48;
  }
  if suffix_len >= 6 {
    k1 ^= (suffix[5] as u64) << 40;
  }
  if suffix_len >= 5 {
    k1 ^= (suffix[4] as u64) << 32;
  }
  if suffix_len >= 4 {
    k1 ^= (suffix[3] as u64) << 24;
  }
  if suffix_len >= 3 {
    k1 ^= (suffix[2] as u64) << 16;
  }
  if suffix_len >= 2 {
    k1 ^= (suffix[1] as u64) << 8;
  }
  if suffix_len >= 1 {
    k1 ^= suffix[0] as u64;
    k1 = k1.wrapping_mul(c1);
    k1 = k1.rotate_left(31);
    k1 = k1.wrapping_mul(c2);
    h1 ^= k1;
  }

  h1 ^= len as u64;
  h2 ^= len as u64;
  h1 = h1.wrapping_add(h2);
  h2 = h2.wrapping_add(h1);
  h1 = fmix64(h1);
  h2 = fmix64(h2);
  h1 = h1.wrapping_add(h2);
  h2 = h2.wrapping_add(h1);

  (h1, h2)
}

/// garnet/libs/common/HashUtils.cs:MurmurHash2x64A
#[inline]
pub fn murmur_hash2_x64_a(b_string: &[u8], seed: u32) -> u64 {
  let m: u64 = 0xc6a4a7935bd1e995;
  let r = 47;
  let len = b_string.len();
  let mut h = (seed as u64) ^ ((len as u64).wrapping_mul(m));

  // 8 字节整块：as_chunks 消除索引边界检查，剩余尾部一次性给出
  let (blocks, suffix) = b_string.as_chunks::<8>();
  for block in blocks {
    let mut k = u64::from_le_bytes(*block);

    k = k.wrapping_mul(m);
    k ^= k >> r;
    k = k.wrapping_mul(m);
    h ^= k;
    h = h.wrapping_mul(m);
  }

  let cs = suffix.len();

  if cs >= 7 {
    h ^= (suffix[6] as u64) << 48;
  }
  if cs >= 6 {
    h ^= (suffix[5] as u64) << 40;
  }
  if cs >= 5 {
    h ^= (suffix[4] as u64) << 32;
  }
  if cs >= 4 {
    h ^= (suffix[3] as u64) << 24;
  }
  if cs >= 3 {
    h ^= (suffix[2] as u64) << 16;
  }
  if cs >= 2 {
    h ^= (suffix[1] as u64) << 8;
  }
  if cs >= 1 {
    h ^= suffix[0] as u64;
    h = h.wrapping_mul(m);
  }

  h ^= h >> r;
  h = h.wrapping_mul(m);
  h ^= h >> r;

  h
}