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Overview
| Comment: | In the OP_MakeRecord opcode, factor out affinity changes into separate loop, for a slight performance advantage. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 1c6ee9b85f61e5cdb5d9b7815cddf526 |
| User & Date: | drh 2013-12-10 20:53:01 |
Context
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2013-12-10
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| 21:38 | Avoid unnecessary calls to sqlite3VdbeSerialType() from within sqlite3VdbeSerialPut(). check-in: 079c04a5 user: drh tags: trunk | |
| 20:53 | In the OP_MakeRecord opcode, factor out affinity changes into separate loop, for a slight performance advantage. check-in: 1c6ee9b8 user: drh tags: trunk | |
| 19:49 | Simplify and improve the performance of the sqlite3VdbeMemGrow() routine. check-in: 48ecf187 user: drh tags: trunk | |
Changes
Changes to src/vdbe.c.
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pLast = &pData0[nField-1]; file_format = p->minWriteFileFormat; /* Identify the output register */ assert( pOp->p3<pOp->p1 || pOp->p3>=pOp->p1+pOp->p2 ); pOut = &aMem[pOp->p3]; memAboutToChange(p, pOut); /* Loop through the elements that will make up the record to figure ** out how much space is required for the new record. */ assert( pData0<=pLast ); pRec = pLast; do{ assert( memIsValid(pRec) ); if( zAffinity ){ applyAffinity(pRec, zAffinity[pRec-pData0], encoding); } serial_type = sqlite3VdbeSerialType(pRec, file_format); len = sqlite3VdbeSerialTypeLen(serial_type); if( pRec->flags & MEM_Zero ){ if( nData ){ sqlite3VdbeMemExpandBlob(pRec); }else{ nZero += pRec->u.nZero; |
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pLast = &pData0[nField-1]; file_format = p->minWriteFileFormat; /* Identify the output register */ assert( pOp->p3<pOp->p1 || pOp->p3>=pOp->p1+pOp->p2 ); pOut = &aMem[pOp->p3]; memAboutToChange(p, pOut); /* Apply the requested affinity to all inputs */ assert( pData0<=pLast ); if( zAffinity ){ pRec = pData0; do{ applyAffinity(pRec, *(zAffinity++), encoding); }while( (++pRec)<=pLast ); } /* 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) ); serial_type = sqlite3VdbeSerialType(pRec, file_format); len = sqlite3VdbeSerialTypeLen(serial_type); if( pRec->flags & MEM_Zero ){ if( nData ){ sqlite3VdbeMemExpandBlob(pRec); }else{ nZero += pRec->u.nZero; |