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Optimization to sqltie3BtreeParseCellPtr. 0.3% performance increase. (CVS 5432)

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FossilOrigin-Name: 77e099ad7de84fe07dfeb4c045c769653dd13b93
This commit is contained in:
drh
2008-07-18 00:57:33 +00:00
parent 44845221ed
commit 79df1f4a37
3 changed files with 21 additions and 22 deletions
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29
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.484 2008/07/17 18:39:58 drh Exp $
** $Id: btree.c,v 1.485 2008/07/18 00:57:33 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** See the header comment on "btreeInt.h" for additional information.
@@ -564,31 +564,30 @@ void sqlite3BtreeParseCellPtr(
assert( pPage->leaf==0 || pPage->leaf==1 );
n = pPage->childPtrSize;
assert( n==4-4*pPage->leaf );
if( pPage->hasData ){
n += getVarint32(&pCell[n], nPayload);
}else{
nPayload = 0;
}
pInfo->nData = nPayload;
if( pPage->intKey ){
n += getVarint(&pCell[n], (u64 *)&pInfo->nKey);
if( pPage->hasData ){
n += getVarint32(&pCell[n], nPayload);
}else{
nPayload = 0;
}
n += getVarint(&pCell[n], (u64*)&pInfo->nKey);
pInfo->nData = nPayload;
}else{
u32 x;
n += getVarint32(&pCell[n], x);
pInfo->nKey = x;
nPayload += x;
pInfo->nData = 0;
n += getVarint32(&pCell[n], nPayload);
pInfo->nKey = nPayload;
}
pInfo->nPayload = nPayload;
pInfo->nHeader = n;
if( nPayload<=pPage->maxLocal ){
if( likely(nPayload<=pPage->maxLocal) ){
/* This is the (easy) common case where the entire payload fits
** on the local page. No overflow is required.
*/
int nSize; /* Total size of cell content in bytes */
nSize = nPayload + n;
pInfo->nLocal = nPayload;
pInfo->iOverflow = 0;
nSize = nPayload + n;
if( nSize<4 ){
if( (nSize & ~3)==0 ){
nSize = 4; /* Minimum cell size is 4 */
}
pInfo->nSize = nSize;