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Overview
| Comment: | Factor an "if" out of a loop in balance_nonroot() for about a 1% performance increase. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
1bd72d0c616e20fdb395c72ecd965790 |
| User & Date: | drh 2011-06-03 17:50:49.782 |
Context
|
2011-06-03
| ||
| 20:11 | Create and use a function especially for adding the ParseSchema opcode. This gives a small reduction in code and a small performance increase. (check-in: 957b2ab67c user: drh tags: trunk) | |
| 17:50 | Factor an "if" out of a loop in balance_nonroot() for about a 1% performance increase. (check-in: 1bd72d0c61 user: drh tags: trunk) | |
| 14:19 | Hush some harmless compiler warnings in the URI parsing logic. (check-in: 0206bc6f87 user: drh tags: trunk) | |
Changes
Changes to src/btree.c.
| ︙ | ︙ | |||
853 854 855 856 857 858 859 860 861 862 863 864 865 866 |
** the page, 1 means the second cell, and so forth) return a pointer
** to the cell content.
**
** This routine works only for pages that do not contain overflow cells.
*/
#define findCell(P,I) \
((P)->aData + ((P)->maskPage & get2byte(&(P)->aData[(P)->cellOffset+2*(I)])))
/*
** This a more complex version of findCell() that works for
** pages that do contain overflow cells.
*/
static u8 *findOverflowCell(MemPage *pPage, int iCell){
int i;
| > > | 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 |
** the page, 1 means the second cell, and so forth) return a pointer
** to the cell content.
**
** This routine works only for pages that do not contain overflow cells.
*/
#define findCell(P,I) \
((P)->aData + ((P)->maskPage & get2byte(&(P)->aData[(P)->cellOffset+2*(I)])))
#define findCellv2(D,M,O,I) (D+(M&get2byte(D+(O+2*(I)))))
/*
** This a more complex version of findCell() that works for
** pages that do contain overflow cells.
*/
static u8 *findOverflowCell(MemPage *pPage, int iCell){
int i;
|
| ︙ | ︙ | |||
6012 6013 6014 6015 6016 6017 6018 |
** process of being overwritten. */
MemPage *pOld = apCopy[i] = (MemPage*)&aSpace1[pBt->pageSize + k*i];
memcpy(pOld, apOld[i], sizeof(MemPage));
pOld->aData = (void*)&pOld[1];
memcpy(pOld->aData, apOld[i]->aData, pBt->pageSize);
limit = pOld->nCell+pOld->nOverflow;
| > | | | | | | > > > > > > > > > > > | 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 |
** process of being overwritten. */
MemPage *pOld = apCopy[i] = (MemPage*)&aSpace1[pBt->pageSize + k*i];
memcpy(pOld, apOld[i], sizeof(MemPage));
pOld->aData = (void*)&pOld[1];
memcpy(pOld->aData, apOld[i]->aData, pBt->pageSize);
limit = pOld->nCell+pOld->nOverflow;
if( pOld->nOverflow>0 ){
for(j=0; j<limit; j++){
assert( nCell<nMaxCells );
apCell[nCell] = findOverflowCell(pOld, j);
szCell[nCell] = cellSizePtr(pOld, apCell[nCell]);
nCell++;
}
}else{
u8 *aData = pOld->aData;
u16 maskPage = pOld->maskPage;
u16 cellOffset = pOld->cellOffset;
for(j=0; j<limit; j++){
assert( nCell<nMaxCells );
apCell[nCell] = findCellv2(aData, maskPage, cellOffset, j);
szCell[nCell] = cellSizePtr(pOld, apCell[nCell]);
nCell++;
}
}
if( i<nOld-1 && !leafData){
u16 sz = (u16)szNew[i];
u8 *pTemp;
assert( nCell<nMaxCells );
szCell[nCell] = sz;
pTemp = &aSpace1[iSpace1];
iSpace1 += sz;
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| ︙ | ︙ |