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Performance optimization in btree.c. (CVS 2990)

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FossilOrigin-Name: 3e1e6affe256a950a81ad5939b628bafb8463b42
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drh
2006-01-22 21:52:56 +00:00
parent eda639e111
commit 504b69898b
4 changed files with 21 additions and 16 deletions
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17
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 1.306 2006/01/21 12:08:54 danielk1977 Exp $
** $Id: btree.c,v 1.307 2006/01/22 21:52:57 drh Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -462,7 +462,8 @@ static void put4byte(unsigned char *p, u32 v){
** file.
*/
#define getVarint sqlite3GetVarint
#define getVarint32 sqlite3GetVarint32
/* #define getVarint32 sqlite3GetVarint32 */
#define getVarint32(A,B) ((*B=*(A))<=0x7f?1:sqlite3GetVarint32(A,B))
#define putVarint sqlite3PutVarint
/* The database page the PENDING_BYTE occupies. This page is never used.
@@ -920,12 +921,16 @@ static void parseCellPtr(
}else{
nPayload = 0;
}
n += getVarint(&pCell[n], (u64 *)&pInfo->nKey);
pInfo->nHeader = n;
pInfo->nData = nPayload;
if( !pPage->intKey ){
nPayload += pInfo->nKey;
if( pPage->intKey ){
n += getVarint(&pCell[n], (u64 *)&pInfo->nKey);
}else{
u32 x;
n += getVarint32(&pCell[n], &x);
pInfo->nKey = x;
nPayload += x;
}
pInfo->nHeader = n;
if( nPayload<=pPage->maxLocal ){
/* This is the (easy) common case where the entire payload fits
** on the local page. No overflow is required.