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Save a 78 bytes of code space and a million CPU cycles in speedtest1 by

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storing the cell index for the leaf page in the BtCursor object in its own
field (BtCursor.ix), rather than as an entry in the BtCursor.aiIdx array.

FossilOrigin-Name: 2452f0617d1085689264b5f66681788cfe9e3b1a7b318307c93942b702a443df
This commit is contained in:
drh
2017-04-01 00:20:06 +00:00
parent 53b2459a36
commit 75e96b3100
4 changed files with 48 additions and 46 deletions
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77
src/btree.c
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@@ -4317,7 +4317,7 @@ int sqlite3BtreeCloseCursor(BtCursor *pCur){
CellInfo info;
int iPage = pCur->iPage;
memset(&info, 0, sizeof(info));
btreeParseCell(pCur->apPage[iPage], pCur->aiIdx[iPage], &info);
btreeParseCell(pCur->apPage[iPage], pCur->ix, &info);
assert( CORRUPT_DB || memcmp(&info, &pCur->info, sizeof(info))==0 );
}
#else
@@ -4327,7 +4327,7 @@ static SQLITE_NOINLINE void getCellInfo(BtCursor *pCur){
if( pCur->info.nSize==0 ){
int iPage = pCur->iPage;
pCur->curFlags |= BTCF_ValidNKey;
btreeParseCell(pCur->apPage[iPage],pCur->aiIdx[iPage],&pCur->info);
btreeParseCell(pCur->apPage[iPage],pCur->ix,&pCur->info);
}else{
assertCellInfo(pCur);
}
@@ -4534,7 +4534,7 @@ static int accessPayload(
assert( pPage );
assert( eOp==0 || eOp==1 );
assert( pCur->eState==CURSOR_VALID );
assert( pCur->aiIdx[pCur->iPage]<pPage->nCell );
assert( pCur->ix<pPage->nCell );
assert( cursorHoldsMutex(pCur) );
getCellInfo(pCur);
@@ -4721,7 +4721,7 @@ int sqlite3BtreePayload(BtCursor *pCur, u32 offset, u32 amt, void *pBuf){
assert( cursorHoldsMutex(pCur) );
assert( pCur->eState==CURSOR_VALID );
assert( pCur->iPage>=0 && pCur->apPage[pCur->iPage] );
assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
assert( pCur->ix<pCur->apPage[pCur->iPage]->nCell );
return accessPayload(pCur, offset, amt, (unsigned char*)pBuf, 0);
}
@@ -4783,7 +4783,7 @@ static const void *fetchPayload(
assert( pCur->eState==CURSOR_VALID );
assert( sqlite3_mutex_held(pCur->pBtree->db->mutex) );
assert( cursorOwnsBtShared(pCur) );
assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
assert( pCur->ix<pCur->apPage[pCur->iPage]->nCell );
assert( pCur->info.nSize>0 );
assert( pCur->info.pPayload>pCur->apPage[pCur->iPage]->aData || CORRUPT_DB );
assert( pCur->info.pPayload<pCur->apPage[pCur->iPage]->aDataEnd ||CORRUPT_DB);
@@ -4834,8 +4834,8 @@ static int moveToChild(BtCursor *pCur, u32 newPgno){
}
pCur->info.nSize = 0;
pCur->curFlags &= ~(BTCF_ValidNKey|BTCF_ValidOvfl);
pCur->iPage++;
pCur->aiIdx[pCur->iPage] = 0;
pCur->aiIdx[pCur->iPage++] = pCur->ix;
pCur->ix = 0;
return getAndInitPage(pBt, newPgno, &pCur->apPage[pCur->iPage],
pCur, pCur->curPagerFlags);
}
@@ -4883,6 +4883,7 @@ static void moveToParent(BtCursor *pCur){
testcase( pCur->aiIdx[pCur->iPage-1] > pCur->apPage[pCur->iPage-1]->nCell );
pCur->info.nSize = 0;
pCur->curFlags &= ~(BTCF_ValidNKey|BTCF_ValidOvfl);
pCur->ix = pCur->aiIdx[pCur->iPage-1];
releasePageNotNull(pCur->apPage[pCur->iPage--]);
}
@@ -4964,7 +4965,7 @@ static int moveToRoot(BtCursor *pCur){
}
skip_init:
pCur->aiIdx[0] = 0;
pCur->ix = 0;
pCur->info.nSize = 0;
pCur->curFlags &= ~(BTCF_AtLast|BTCF_ValidNKey|BTCF_ValidOvfl);
@@ -4998,8 +4999,8 @@ static int moveToLeftmost(BtCursor *pCur){
assert( cursorOwnsBtShared(pCur) );
assert( pCur->eState==CURSOR_VALID );
while( rc==SQLITE_OK && !(pPage = pCur->apPage[pCur->iPage])->leaf ){
assert( pCur->aiIdx[pCur->iPage]<pPage->nCell );
pgno = get4byte(findCell(pPage, pCur->aiIdx[pCur->iPage]));
assert( pCur->ix<pPage->nCell );
pgno = get4byte(findCell(pPage, pCur->ix));
rc = moveToChild(pCur, pgno);
}
return rc;
@@ -5024,11 +5025,11 @@ static int moveToRightmost(BtCursor *pCur){
assert( pCur->eState==CURSOR_VALID );
while( !(pPage = pCur->apPage[pCur->iPage])->leaf ){
pgno = get4byte(&pPage->aData[pPage->hdrOffset+8]);
pCur->aiIdx[pCur->iPage] = pPage->nCell;
pCur->ix = pPage->nCell;
rc = moveToChild(pCur, pgno);
if( rc ) return rc;
}
pCur->aiIdx[pCur->iPage] = pPage->nCell-1;
pCur->ix = pPage->nCell-1;
assert( pCur->info.nSize==0 );
assert( (pCur->curFlags & BTCF_ValidNKey)==0 );
return SQLITE_OK;
@@ -5076,7 +5077,7 @@ int sqlite3BtreeLast(BtCursor *pCur, int *pRes){
for(ii=0; ii<pCur->iPage; ii++){
assert( pCur->aiIdx[ii]==pCur->apPage[ii]->nCell );
}
assert( pCur->aiIdx[pCur->iPage]==pCur->apPage[pCur->iPage]->nCell-1 );
assert( pCur->ix==pCur->apPage[pCur->iPage]->nCell-1 );
assert( pCur->apPage[pCur->iPage]->leaf );
#endif
return SQLITE_OK;
@@ -5223,7 +5224,7 @@ int sqlite3BtreeMovetoUnpacked(
upr = pPage->nCell-1;
assert( biasRight==0 || biasRight==1 );
idx = upr>>(1-biasRight); /* idx = biasRight ? upr : (lwr+upr)/2; */
pCur->aiIdx[pCur->iPage] = (u16)idx;
pCur->ix = (u16)idx;
if( xRecordCompare==0 ){
for(;;){
i64 nCellKey;
@@ -5242,7 +5243,7 @@ int sqlite3BtreeMovetoUnpacked(
if( lwr>upr ){ c = +1; break; }
}else{
assert( nCellKey==intKey );
pCur->aiIdx[pCur->iPage] = (u16)idx;
pCur->ix = (u16)idx;
if( !pPage->leaf ){
lwr = idx;
goto moveto_next_layer;
@@ -5311,7 +5312,7 @@ int sqlite3BtreeMovetoUnpacked(
rc = SQLITE_NOMEM_BKPT;
goto moveto_finish;
}
pCur->aiIdx[pCur->iPage] = (u16)idx;
pCur->ix = (u16)idx;
rc = accessPayload(pCur, 0, nCell, (unsigned char*)pCellKey, 0);
pCur->curFlags &= ~BTCF_ValidOvfl;
if( rc ){
@@ -5333,7 +5334,7 @@ int sqlite3BtreeMovetoUnpacked(
assert( c==0 );
*pRes = 0;
rc = SQLITE_OK;
pCur->aiIdx[pCur->iPage] = (u16)idx;
pCur->ix = (u16)idx;
if( pIdxKey->errCode ) rc = SQLITE_CORRUPT;
goto moveto_finish;
}
@@ -5345,8 +5346,8 @@ int sqlite3BtreeMovetoUnpacked(
assert( lwr==upr+1 || (pPage->intKey && !pPage->leaf) );
assert( pPage->isInit );
if( pPage->leaf ){
assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
pCur->aiIdx[pCur->iPage] = (u16)idx;
assert( pCur->ix<pCur->apPage[pCur->iPage]->nCell );
pCur->ix = (u16)idx;
*pRes = c;
rc = SQLITE_OK;
goto moveto_finish;
@@ -5357,7 +5358,7 @@ moveto_next_layer:
}else{
chldPg = get4byte(findCell(pPage, lwr));
}
pCur->aiIdx[pCur->iPage] = (u16)lwr;
pCur->ix = (u16)lwr;
rc = moveToChild(pCur, chldPg);
if( rc ) break;
}
@@ -5458,7 +5459,7 @@ static SQLITE_NOINLINE int btreeNext(BtCursor *pCur, int *pRes){
}
pPage = pCur->apPage[pCur->iPage];
idx = ++pCur->aiIdx[pCur->iPage];
idx = ++pCur->ix;
assert( pPage->isInit );
/* If the database file is corrupt, it is possible for the value of idx
@@ -5482,7 +5483,7 @@ static SQLITE_NOINLINE int btreeNext(BtCursor *pCur, int *pRes){
}
moveToParent(pCur);
pPage = pCur->apPage[pCur->iPage];
}while( pCur->aiIdx[pCur->iPage]>=pPage->nCell );
}while( pCur->ix>=pPage->nCell );
if( pPage->intKey ){
return sqlite3BtreeNext(pCur, pRes);
}else{
@@ -5506,8 +5507,8 @@ int sqlite3BtreeNext(BtCursor *pCur, int *pRes){
*pRes = 0;
if( pCur->eState!=CURSOR_VALID ) return btreeNext(pCur, pRes);
pPage = pCur->apPage[pCur->iPage];
if( (++pCur->aiIdx[pCur->iPage])>=pPage->nCell ){
pCur->aiIdx[pCur->iPage]--;
if( (++pCur->ix)>=pPage->nCell ){
pCur->ix--;
return btreeNext(pCur, pRes);
}
if( pPage->leaf ){
@@ -5571,12 +5572,12 @@ static SQLITE_NOINLINE int btreePrevious(BtCursor *pCur, int *pRes){
pPage = pCur->apPage[pCur->iPage];
assert( pPage->isInit );
if( !pPage->leaf ){
int idx = pCur->aiIdx[pCur->iPage];
int idx = pCur->ix;
rc = moveToChild(pCur, get4byte(findCell(pPage, idx)));
if( rc ) return rc;
rc = moveToRightmost(pCur);
}else{
while( pCur->aiIdx[pCur->iPage]==0 ){
while( pCur->ix==0 ){
if( pCur->iPage==0 ){
pCur->eState = CURSOR_INVALID;
*pRes = 1;
@@ -5587,7 +5588,7 @@ static SQLITE_NOINLINE int btreePrevious(BtCursor *pCur, int *pRes){
assert( pCur->info.nSize==0 );
assert( (pCur->curFlags & (BTCF_ValidOvfl))==0 );
pCur->aiIdx[pCur->iPage]--;
pCur->ix--;
pPage = pCur->apPage[pCur->iPage];
if( pPage->intKey && !pPage->leaf ){
rc = sqlite3BtreePrevious(pCur, pRes);
@@ -5606,12 +5607,12 @@ int sqlite3BtreePrevious(BtCursor *pCur, int *pRes){
pCur->curFlags &= ~(BTCF_AtLast|BTCF_ValidOvfl|BTCF_ValidNKey);
pCur->info.nSize = 0;
if( pCur->eState!=CURSOR_VALID
|| pCur->aiIdx[pCur->iPage]==0
|| pCur->ix==0
|| pCur->apPage[pCur->iPage]->leaf==0
){
return btreePrevious(pCur, pRes);
}
pCur->aiIdx[pCur->iPage]--;
pCur->ix--;
return SQLITE_OK;
}
@@ -7933,8 +7934,8 @@ static int balance(BtCursor *pCur){
rc = balance_deeper(pPage, &pCur->apPage[1]);
if( rc==SQLITE_OK ){
pCur->iPage = 1;
pCur->ix = 0;
pCur->aiIdx[0] = 0;
pCur->aiIdx[1] = 0;
assert( pCur->apPage[1]->nOverflow );
}
}else{
@@ -8163,7 +8164,7 @@ int sqlite3BtreeInsert(
if( rc ) goto end_insert;
assert( szNew==pPage->xCellSize(pPage, newCell) );
assert( szNew <= MX_CELL_SIZE(pBt) );
idx = pCur->aiIdx[pCur->iPage];
idx = pCur->ix;
if( loc==0 ){
CellInfo info;
assert( idx<pPage->nCell );
@@ -8191,7 +8192,7 @@ int sqlite3BtreeInsert(
if( rc ) goto end_insert;
}else if( loc<0 && pPage->nCell>0 ){
assert( pPage->leaf );
idx = ++pCur->aiIdx[pCur->iPage];
idx = ++pCur->ix;
}else{
assert( pPage->leaf );
}
@@ -8287,12 +8288,12 @@ int sqlite3BtreeDelete(BtCursor *pCur, u8 flags){
assert( pCur->curFlags & BTCF_WriteFlag );
assert( hasSharedCacheTableLock(p, pCur->pgnoRoot, pCur->pKeyInfo!=0, 2) );
assert( !hasReadConflicts(p, pCur->pgnoRoot) );
assert( pCur->aiIdx[pCur->iPage]<pCur->apPage[pCur->iPage]->nCell );
assert( pCur->ix<pCur->apPage[pCur->iPage]->nCell );
assert( pCur->eState==CURSOR_VALID );
assert( (flags & ~(BTREE_SAVEPOSITION | BTREE_AUXDELETE))==0 );
iCellDepth = pCur->iPage;
iCellIdx = pCur->aiIdx[iCellDepth];
iCellIdx = pCur->ix;
pPage = pCur->apPage[iCellDepth];
pCell = findCell(pPage, iCellIdx);
@@ -8409,7 +8410,7 @@ int sqlite3BtreeDelete(BtCursor *pCur, u8 flags){
pCur->eState = CURSOR_SKIPNEXT;
if( iCellIdx>=pPage->nCell ){
pCur->skipNext = -1;
pCur->aiIdx[iCellDepth] = pPage->nCell-1;
pCur->ix = pPage->nCell-1;
}else{
pCur->skipNext = 1;
}
@@ -8922,16 +8923,16 @@ int sqlite3BtreeCount(BtCursor *pCur, i64 *pnEntry){
return moveToRoot(pCur);
}
moveToParent(pCur);
}while ( pCur->aiIdx[pCur->iPage]>=pCur->apPage[pCur->iPage]->nCell );
}while ( pCur->ix>=pCur->apPage[pCur->iPage]->nCell );
pCur->aiIdx[pCur->iPage]++;
pCur->ix++;
pPage = pCur->apPage[pCur->iPage];
}
/* Descend to the child node of the cell that the cursor currently
** points at. This is the right-child if (iIdx==pPage->nCell).
*/
iIdx = pCur->aiIdx[pCur->iPage];
iIdx = pCur->ix;
if( iIdx==pPage->nCell ){
rc = moveToChild(pCur, get4byte(&pPage->aData[pPage->hdrOffset+8]));
}else{