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Performance improvement to the btree search routine.

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FossilOrigin-Name: 65db822f200bafe9abe59b33b17b2c643c17c5e8
This commit is contained in:
drh
2011-06-04 01:43:53 +00:00
parent 61d2fe955c
commit afb9817f8c
3 changed files with 12 additions and 12 deletions
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10
src/btree.c
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@@ -4453,7 +4453,7 @@ int sqlite3BtreeMovetoUnpacked(
}
assert( pCur->apPage[0]->intKey || pIdxKey );
for(;;){
int lwr, upr;
int lwr, upr, idx;
Pgno chldPg;
MemPage *pPage = pCur->apPage[pCur->iPage];
int c;
@@ -4469,14 +4469,14 @@ int sqlite3BtreeMovetoUnpacked(
lwr = 0;
upr = pPage->nCell-1;
if( biasRight ){
pCur->aiIdx[pCur->iPage] = (u16)upr;
pCur->aiIdx[pCur->iPage] = (u16)(idx = upr);
}else{
pCur->aiIdx[pCur->iPage] = (u16)((upr+lwr)/2);
pCur->aiIdx[pCur->iPage] = (u16)(idx = (upr+lwr)/2);
}
for(;;){
int idx = pCur->aiIdx[pCur->iPage]; /* Index of current cell in pPage */
u8 *pCell; /* Pointer to current cell in pPage */
assert( idx==pCur->aiIdx[pCur->iPage] );
pCur->info.nSize = 0;
pCell = findCell(pPage, idx) + pPage->childPtrSize;
if( pPage->intKey ){
@@ -4559,7 +4559,7 @@ int sqlite3BtreeMovetoUnpacked(
if( lwr>upr ){
break;
}
pCur->aiIdx[pCur->iPage] = (u16)((lwr+upr)/2);
pCur->aiIdx[pCur->iPage] = (u16)(idx = (lwr+upr)/2);
}
assert( lwr==upr+1 );
assert( pPage->isInit );