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Overview
| Comment: | Optimization to the OP_MakeRecord opcode makes speed-check.sh run about 1.1 million cycles faster, and results in a slightly smaller library. |
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| SHA3-256: |
d10e63629183f6daf0c263cd4dae052a |
| User & Date: | drh 2018-09-21 13:07:14.225 |
Context
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2018-09-21
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| 18:43 | Put a limit counter on the query planner that restricts the number of index+constraint options that can be considered for each table in a join. This prevents certain pathological queries from taking up too much time in the query planner. (check-in: 8690b5a0cc user: drh tags: trunk) | |
| 13:07 | Optimization to the OP_MakeRecord opcode makes speed-check.sh run about 1.1 million cycles faster, and results in a slightly smaller library. (check-in: d10e636291 user: drh tags: trunk) | |
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2018-09-20
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| 20:43 | Minor code simplification. (check-in: 22ae8a52dd user: drh tags: trunk) | |
Changes
Changes to src/vdbe.c.
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2890 2891 2892 2893 2894 2895 2896 |
}else{
/* Rare case of a really large header */
nVarint = sqlite3VarintLen(nHdr);
nHdr += nVarint;
if( nVarint<sqlite3VarintLen(nHdr) ) nHdr++;
}
nByte = nHdr+nData;
| < < < > > > > > > > > > > | | > | 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 |
}else{
/* Rare case of a really large header */
nVarint = sqlite3VarintLen(nHdr);
nHdr += nVarint;
if( nVarint<sqlite3VarintLen(nHdr) ) nHdr++;
}
nByte = nHdr+nData;
/* Make sure the output register has a buffer large enough to store
** the new record. The output register (pOp->p3) is not allowed to
** be one of the input registers (because the following call to
** sqlite3VdbeMemClearAndResize() could clobber the value before it is used).
*/
if( nByte+nZero<=pOut->szMalloc ){
/* The output register is already large enough to hold the record.
** No error checks or buffer enlargement is required */
pOut->z = pOut->zMalloc;
}else{
/* Need to make sure that the output is not too big and then enlarge
** the output register to hold the full result */
if( nByte+nZero>db->aLimit[SQLITE_LIMIT_LENGTH] ){
goto too_big;
}
if( sqlite3VdbeMemClearAndResize(pOut, (int)nByte) ){
goto no_mem;
}
}
zNewRecord = (u8 *)pOut->z;
/* Write the record */
i = putVarint32(zNewRecord, nHdr);
j = nHdr;
assert( pData0<=pLast );
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