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Overview
| Comment: | Additional optimizations in sqlite3VdbeRecordCompare(). |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
23ea2b700fd6d28d3b13663d164faba3 |
| User & Date: | drh 2009-11-16 03:13:40 |
References
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2009-11-16
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| 21:28 | Back out part of the change in [23ea2b700fd6d28d] since TH3 reveals some problems in OOM situations. (check-in: 15d215d6 user: drh tags: trunk) | |
Context
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2009-11-16
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| 15:11 | Use the sqlite3CtypeMap to improve the speed and reduce the size of the logic in the tokenizer that recognizes identifiers. (check-in: 1c9243b0 user: drh tags: trunk) | |
| 03:13 | Additional optimizations in sqlite3VdbeRecordCompare(). (check-in: 23ea2b70 user: drh tags: trunk) | |
| 02:14 | Optimizations to the sqlite3VdbeRecordCompare() routine help it to run 12.5% faster for some traces. (check-in: 74c76f0b user: drh tags: trunk) | |
Changes
Changes to src/vdbeaux.c.
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int rc = 0; const unsigned char *aKey1 = (const unsigned char *)pKey1; KeyInfo *pKeyInfo; Mem mem1; pKeyInfo = pPKey2->pKeyInfo; mem1.enc = pKeyInfo->enc; mem1.db = pKeyInfo->db; mem1.flags = 0; VVA_ONLY( mem1.zMalloc = 0; ) /* Only used by assert() statements */ /* Compilers may complain that mem1.u.i is potentially uninitialized. ** We could initialize it, as shown here, to silence those complaints. ** But in fact, mem1.u.i will never actually be used initialized, and doing ** the unnecessary initialization has a measurable negative performance ** impact, since this routine is a very high runner. And so, we choose ** to ignore the compiler warnings and leave this variable uninitialized. |
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2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 |
int rc = 0; const unsigned char *aKey1 = (const unsigned char *)pKey1; KeyInfo *pKeyInfo; Mem mem1; pKeyInfo = pPKey2->pKeyInfo; mem1.enc = pKeyInfo->enc; mem1.db = 0; /* mem1.flags = 0; // Will be initialized by sqlite3VdbeSerialGet() */ VVA_ONLY( mem1.zMalloc = 0; ) /* Only needed by assert() statements */ /* Compilers may complain that mem1.u.i is potentially uninitialized. ** We could initialize it, as shown here, to silence those complaints. ** But in fact, mem1.u.i will never actually be used initialized, and doing ** the unnecessary initialization has a measurable negative performance ** impact, since this routine is a very high runner. And so, we choose ** to ignore the compiler warnings and leave this variable uninitialized. |