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Overview
Comment: | Use the padding word in the Mem object as temporary storage for serial_type value in OP_Record, and thus avoid a redundant computation of the serial_type for each column. |
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Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
4b3b65ee5ea61e9b9671ca027940bf02 |
User & Date: | drh 2014-10-13 20:12:47.457 |
Context
2014-10-13
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23:39 | Optimize a database corruption test inside of the OP_Column opcode. (check-in: 005e5b388a user: drh tags: trunk) | |
20:12 | Use the padding word in the Mem object as temporary storage for serial_type value in OP_Record, and thus avoid a redundant computation of the serial_type for each column. (check-in: 4b3b65ee5e user: drh tags: trunk) | |
17:42 | Three small optimizations to vdbeaux.c. (check-in: 04892f8ba6 user: drh tags: trunk) | |
Changes
Changes to src/vdbe.c.
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2612 2613 2614 2615 2616 2617 2618 | /* Loop through the elements that will make up the record to figure ** out how much space is required for the new record. */ pRec = pLast; do{ assert( memIsValid(pRec) ); | | | 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 | /* Loop through the elements that will make up the record to figure ** out how much space is required for the new record. */ pRec = pLast; do{ assert( memIsValid(pRec) ); pRec->uTemp = serial_type = sqlite3VdbeSerialType(pRec, file_format); len = sqlite3VdbeSerialTypeLen(serial_type); if( pRec->flags & MEM_Zero ){ if( nData ){ sqlite3VdbeMemExpandBlob(pRec); }else{ nZero += pRec->u.nZero; len -= pRec->u.nZero; |
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2661 2662 2663 2664 2665 2666 2667 | /* Write the record */ i = putVarint32(zNewRecord, nHdr); j = nHdr; assert( pData0<=pLast ); pRec = pData0; do{ | | | 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 | /* Write the record */ i = putVarint32(zNewRecord, nHdr); j = nHdr; assert( pData0<=pLast ); pRec = pData0; do{ serial_type = pRec->uTemp; i += putVarint32(&zNewRecord[i], serial_type); /* serial type */ j += sqlite3VdbeSerialPut(&zNewRecord[j], pRec, serial_type); /* content */ }while( (++pRec)<=pLast ); assert( i==nHdr ); assert( j==nByte ); assert( pOp->p3>0 && pOp->p3<=(p->nMem-p->nCursor) ); |
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Changes to src/vdbeInt.h.
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171 172 173 174 175 176 177 | u16 flags; /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */ u8 enc; /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */ int n; /* Number of characters in string value, excluding '\0' */ char *z; /* String or BLOB value */ /* ShallowCopy only needs to copy the information above */ char *zMalloc; /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */ int szMalloc; /* Size of the zMalloc allocation */ | | | 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | u16 flags; /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */ u8 enc; /* SQLITE_UTF8, SQLITE_UTF16BE, SQLITE_UTF16LE */ int n; /* Number of characters in string value, excluding '\0' */ char *z; /* String or BLOB value */ /* ShallowCopy only needs to copy the information above */ char *zMalloc; /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */ int szMalloc; /* Size of the zMalloc allocation */ u32 uTemp; /* Transient storage for serial_type in OP_MakeRecord */ sqlite3 *db; /* The associated database connection */ void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */ #ifdef SQLITE_DEBUG Mem *pScopyFrom; /* This Mem is a shallow copy of pScopyFrom */ void *pFiller; /* So that sizeof(Mem) is a multiple of 8 */ #endif }; |
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