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Overview
Comment: | Further performance enhancements on the delta generator. |
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Downloads: | Tarball | ZIP archive | SQL archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
09d3e7ebf0d59ac39b44c4f319748ce9 |
User & Date: | drh 2015-12-27 21:02:32 |
Context
2015-12-29
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05:43 | Several documentation wording improvements on the front page. ... (check-in: ebe25922 user: mistachkin tags: trunk) | |
2015-12-27
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21:02 | Further performance enhancements on the delta generator. ... (check-in: 09d3e7eb user: drh tags: trunk) | |
20:05 | Performance optimizations for the delta generator. ... (check-in: dbbe3202 user: drh tags: trunk) | |
Changes
Changes to src/delta.c.
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100 101 102 103 104 105 106 | }; /* ** Initialize the rolling hash using the first NHASH characters of z[] */ static void hash_init(hash *pHash, const char *z){ u16 a, b, i; | | | | 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | }; /* ** Initialize the rolling hash using the first NHASH characters of z[] */ static void hash_init(hash *pHash, const char *z){ u16 a, b, i; a = b = z[0]; for(i=1; i<NHASH; i++){ a += z[i]; b += a; } memcpy(pHash->z, z, NHASH); pHash->a = a & 0xffff; pHash->b = b & 0xffff; pHash->i = 0; |
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139 140 141 142 143 144 145 | ** This routine is intended to be equivalent to: ** hash h; ** hash_init(&h, zInput); ** return hash_32bit(&h); */ static u32 hash_once(const char *z){ u16 a, b, i; | | | | 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | ** This routine is intended to be equivalent to: ** hash h; ** hash_init(&h, zInput); ** return hash_32bit(&h); */ static u32 hash_once(const char *z){ u16 a, b, i; a = b = z[0]; for(i=1; i<NHASH; i++){ a += z[i]; b += a; } return a | (((u32)b)<<16); } /* |
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