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Overview
| Comment: | Add the OP_IntCopy opcode - an optimized version of OP_SCopy that only works for integer values. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 3a2f73a4924860fde8ee41ad646e7a02d29ad9d5 |
| User & Date: | drh 2015-10-15 18:04:59 |
Context
|
2015-10-15
| ||
| 19:21 | Enhance the use of the column cache for UPDATE statements, making them more efficient for the case where a column is modified to be an expression of other unmodified columns. check-in: 871e091d user: drh tags: trunk | |
| 18:04 | Add the OP_IntCopy opcode - an optimized version of OP_SCopy that only works for integer values. check-in: 3a2f73a4 user: drh tags: trunk | |
| 17:31 | Optimization to the out2Prerelease() helper routine in the VDBE engine. check-in: 79298fe8 user: drh tags: trunk | |
Changes
Changes to src/insert.c.
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if( iField==XN_ROWID || iField==pTab->iPKey ){
if( regRowid==regIdx+i ) continue; /* ROWID already in regIdx+i */
x = regNewData;
regRowid = pIdx->pPartIdxWhere ? -1 : regIdx+i;
}else{
x = iField + regNewData + 1;
}
sqlite3VdbeAddOp2(v, OP_SCopy, x, regIdx+i);
VdbeComment((v, "%s", iField<0 ? "rowid" : pTab->aCol[iField].zName));
}
}
sqlite3VdbeAddOp3(v, OP_MakeRecord, regIdx, pIdx->nColumn, aRegIdx[ix]);
VdbeComment((v, "for %s", pIdx->zName));
sqlite3ExprCacheAffinityChange(pParse, regIdx, pIdx->nColumn);
|
| |
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 |
if( iField==XN_ROWID || iField==pTab->iPKey ){
if( regRowid==regIdx+i ) continue; /* ROWID already in regIdx+i */
x = regNewData;
regRowid = pIdx->pPartIdxWhere ? -1 : regIdx+i;
}else{
x = iField + regNewData + 1;
}
sqlite3VdbeAddOp2(v, iField<0 ? OP_IntCopy : OP_SCopy, x, regIdx+i);
VdbeComment((v, "%s", iField<0 ? "rowid" : pTab->aCol[iField].zName));
}
}
sqlite3VdbeAddOp3(v, OP_MakeRecord, regIdx, pIdx->nColumn, aRegIdx[ix]);
VdbeComment((v, "for %s", pIdx->zName));
sqlite3ExprCacheAffinityChange(pParse, regIdx, pIdx->nColumn);
|
Changes to src/vdbe.c.
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assert( pOut!=pIn1 ); sqlite3VdbeMemShallowCopy(pOut, pIn1, MEM_Ephem); #ifdef SQLITE_DEBUG if( pOut->pScopyFrom==0 ) pOut->pScopyFrom = pIn1; #endif break; } /* Opcode: ResultRow P1 P2 * * * ** Synopsis: output=r[P1@P2] ** ** The registers P1 through P1+P2-1 contain a single row of ** results. This opcode causes the sqlite3_step() call to terminate ** with an SQLITE_ROW return code and it sets up the sqlite3_stmt |
> > > > > > > > > > > > > > > > |
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assert( pOut!=pIn1 ); sqlite3VdbeMemShallowCopy(pOut, pIn1, MEM_Ephem); #ifdef SQLITE_DEBUG if( pOut->pScopyFrom==0 ) pOut->pScopyFrom = pIn1; #endif break; } /* Opcode: IntCopy P1 P2 * * * ** Synopsis: r[P2]=r[P1] ** ** Transfer the integer value held in register P1 into register P2. ** ** This is an optimized version of SCopy that works only for integer ** values. */ case OP_IntCopy: { /* out2 */ pIn1 = &aMem[pOp->p1]; assert( (pIn1->flags & MEM_Int)!=0 ); pOut = &aMem[pOp->p2]; sqlite3VdbeMemSetInt64(pOut, pIn1->u.i); break; } /* Opcode: ResultRow P1 P2 * * * ** Synopsis: output=r[P1@P2] ** ** The registers P1 through P1+P2-1 contain a single row of ** results. This opcode causes the sqlite3_step() call to terminate ** with an SQLITE_ROW return code and it sets up the sqlite3_stmt |