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Cache values of UnpackedRecord.aMem[0] into new fields of UnpackedRecord.

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This avoids extra indirections and saves about 750K cycles.

FossilOrigin-Name: 7cf2d1f0396362aae7b93da75c2036d52ba86acba1cc90abca560bcf0314a22f
This commit is contained in:
drh
2022-02-27 21:10:49 +00:00
parent a1e951fa48
commit f357cafaf5
4 changed files with 23 additions and 12 deletions
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5
src/sqliteInt.h
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@@ -2517,6 +2517,11 @@ struct KeyInfo {
struct UnpackedRecord {
KeyInfo *pKeyInfo; /* Collation and sort-order information */
Mem *aMem; /* Values */
union {
char *z; /* Cache of aMem[0].z for vdbeRecordCompareString() */
i64 i; /* Cache of aMem[0].u.i for vdbeRecordCompareInt() */
} u;
int n; /* Cache of aMem[0].n used by vdbeRecordCompareString() */
u16 nField; /* Number of entries in apMem[] */
i8 default_rc; /* Comparison result if keys are equal */
u8 errCode; /* Error detected by xRecordCompare (CORRUPT or NOMEM) */