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Rearrange fields of the BtCursor object so that it is smaller and requires less

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initialization, for a small performance improvement.

FossilOrigin-Name: 0ddf5292cc0411ec6fcb7399ecf2904c899e0488404d3f65490fbe1db15efdf4
This commit is contained in:
drh
2018-01-24 16:04:21 +00:00
parent fe875027d7
commit da6bc6792f
4 changed files with 21 additions and 21 deletions
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7
src/btree.c
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@@ -4345,7 +4345,7 @@ int sqlite3BtreeCursorSize(void){
** of run-time by skipping the initialization of those elements.
*/
void sqlite3BtreeCursorZero(BtCursor *p){
memset(p, 0, offsetof(BtCursor, iPage));
memset(p, 0, offsetof(BtCursor, BTCURSOR_FIRST_UNINIT));
}
/*
@@ -4668,14 +4668,15 @@ static int accessPayload(
*/
if( (pCur->curFlags & BTCF_ValidOvfl)==0 ){
int nOvfl = (pCur->info.nPayload-pCur->info.nLocal+ovflSize-1)/ovflSize;
if( nOvfl>pCur->nOvflAlloc ){
if( pCur->aOverflow==0
|| nOvfl*sizeof(Pgno) > sqlite3MallocSize(pCur->aOverflow)
){
Pgno *aNew = (Pgno*)sqlite3Realloc(
pCur->aOverflow, nOvfl*2*sizeof(Pgno)
);
if( aNew==0 ){
return SQLITE_NOMEM_BKPT;
}else{
pCur->nOvflAlloc = nOvfl*2;
pCur->aOverflow = aNew;
}
}