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Small performance optimization in btree.c.

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FossilOrigin-Name: f710cce13577788cf3b95ed7089c3af2854271ff53f0a0b7b0619f315e331eff
This commit is contained in:
drh
2022-11-19 00:22:12 +00:00
parent cf3107c7d4
commit 85728a21c6
3 changed files with 26 additions and 26 deletions
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38
src/btree.c
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@@ -5495,9 +5495,25 @@ int sqlite3BtreeFirst(BtCursor *pCur, int *pRes){
** on success. Set *pRes to 0 if the cursor actually points to something
** or set *pRes to 1 if the table is empty.
*/
static SQLITE_NOINLINE int btreeLast(BtCursor *pCur, int *pRes){
int rc = moveToRoot(pCur);
if( rc==SQLITE_OK ){
assert( pCur->eState==CURSOR_VALID );
*pRes = 0;
rc = moveToRightmost(pCur);
if( rc==SQLITE_OK ){
pCur->curFlags |= BTCF_AtLast;
}else{
pCur->curFlags &= ~BTCF_AtLast;
}
}else if( rc==SQLITE_EMPTY ){
assert( pCur->pgnoRoot==0 || pCur->pPage->nCell==0 );
*pRes = 1;
rc = SQLITE_OK;
}
return rc;
}
int sqlite3BtreeLast(BtCursor *pCur, int *pRes){
int rc;
assert( cursorOwnsBtShared(pCur) );
assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
@@ -5518,23 +5534,7 @@ int sqlite3BtreeLast(BtCursor *pCur, int *pRes){
*pRes = 0;
return SQLITE_OK;
}
rc = moveToRoot(pCur);
if( rc==SQLITE_OK ){
assert( pCur->eState==CURSOR_VALID );
*pRes = 0;
rc = moveToRightmost(pCur);
if( rc==SQLITE_OK ){
pCur->curFlags |= BTCF_AtLast;
}else{
pCur->curFlags &= ~BTCF_AtLast;
}
}else if( rc==SQLITE_EMPTY ){
assert( pCur->pgnoRoot==0 || pCur->pPage->nCell==0 );
*pRes = 1;
rc = SQLITE_OK;
}
return rc;
return btreeLast(pCur, pRes);
}
/* Move the cursor so that it points to an entry in a table (a.k.a INTKEY)