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Simplifications and performance improvements in insertCell().

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FossilOrigin-Name: 7d02e6c992ef92e1f77ebc13889e17c028454b06
This commit is contained in:
drh
2015-06-25 19:53:48 +00:00
parent b7580e84a8
commit 2c8fb926da
3 changed files with 18 additions and 18 deletions
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22
src/btree.c
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@@ -6197,10 +6197,8 @@ static void insertCell(
){
int idx = 0; /* Where to write new cell content in data[] */
int j; /* Loop counter */
int end; /* First byte past the last cell pointer in data[] */
int ins; /* Index in data[] where new cell pointer is inserted */
int cellOffset; /* Address of first cell pointer in data[] */
u8 *data; /* The content of the whole page */
u8 *pIns; /* The point in pPage->aCellIdx[] where no cell inserted */
if( *pRC ) return;
@@ -6244,24 +6242,26 @@ static void insertCell(
}
assert( sqlite3PagerIswriteable(pPage->pDbPage) );
data = pPage->aData;
cellOffset = pPage->cellOffset;
end = cellOffset + 2*pPage->nCell;
ins = cellOffset + 2*i;
assert( &data[pPage->cellOffset]==pPage->aCellIdx );
rc = allocateSpace(pPage, sz, &idx);
if( rc ){ *pRC = rc; return; }
/* The allocateSpace() routine guarantees the following properties
** if it returns successfully */
assert( idx >= 0 && (idx >= end+2 || CORRUPT_DB) );
assert( idx >= 0 );
assert( idx >= pPage->cellOffset+2*pPage->nCell+2 || CORRUPT_DB );
assert( idx+sz <= (int)pPage->pBt->usableSize );
pPage->nCell++;
pPage->nFree -= (u16)(2 + sz);
memcpy(&data[idx], pCell, sz);
if( iChild ){
put4byte(&data[idx], iChild);
}
memmove(&data[ins+2], &data[ins], end-ins);
put2byte(&data[ins], idx);
put2byte(&data[pPage->hdrOffset+3], pPage->nCell);
pIns = pPage->aCellIdx + i*2;
memmove(pIns+2, pIns, 2*(pPage->nCell - i));
put2byte(pIns, idx);
pPage->nCell++;
/* increment the cell count */
if( (++data[pPage->hdrOffset+4])==0 ) data[pPage->hdrOffset+3]++;
assert( get2byte(&data[pPage->hdrOffset+3])==pPage->nCell );
#ifndef SQLITE_OMIT_AUTOVACUUM
if( pPage->pBt->autoVacuum ){
/* The cell may contain a pointer to an overflow page. If so, write