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More improvements to sqlite3BtreeMovetoUnpacked() performance.

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FossilOrigin-Name: 88680698231b7141401f7166e3aff8dbc6008030
This commit is contained in:
drh
2013-11-25 14:10:15 +00:00
parent ec3e6b10f4
commit d793f44723
3 changed files with 23 additions and 23 deletions
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15
manifest
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@@ -1,5 +1,5 @@
C Performance\simprovements\sin\ssqlite3BtreeMovetoUnpacked().
D 2013-11-25T02:38:55.810
C More\simprovements\sto\ssqlite3BtreeMovetoUnpacked()\sperformance.
D 2013-11-25T14:10:15.692
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in e1a9b4258bbde53f5636f4e238c65b7e11459e2b
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -166,7 +166,7 @@ F src/auth.c 523da7fb4979469955d822ff9298352d6b31de34
F src/backup.c 1809a7caa2504233bdddd12f5018422421789537
F src/bitvec.c 19a4ba637bd85f8f63fc8c9bae5ade9fb05ec1cb
F src/btmutex.c 976f45a12e37293e32cae0281b15a21d48a8aaa7
F src/btree.c b0fd869c044bbf29640b9e53c43d8846a929d7f4
F src/btree.c c300cb68948a03f0049addddd9e36f28551e78ae
F src/btree.h a61ddebc78c66795a2b93181321a116746302cc9
F src/btreeInt.h f038e818bfadf75afbd09819ed93c26a333d39e0
F src/build.c 07054d45319953e54a89d726e589a423e9c1c590
@@ -1142,10 +1142,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh d1a6de74685f360ab718efda6265994b99bbea01
F tool/win/sqlite.vsix 030f3eeaf2cb811a3692ab9c14d021a75ce41fff
P 8f3c767a30c552548ead104ca125f182ce4849ad
R c168ba651eff475cfa32f75aa61b62eb
T *branch * btree-optimization
T *sym-btree-optimization *
T -sym-trunk *
P d0fb7acea7cbfe6f2d84782a28bb51675a06576f
R 29c1330ebdfb45d969bc6dbf6661ccf0
U drh
Z f59a524da90eada9da104b9026589d30
Z d111eff6e7e1e09087be24d32976d9d6

2
manifest.uuid
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@@ -1 +1 @@
d0fb7acea7cbfe6f2d84782a28bb51675a06576f
88680698231b7141401f7166e3aff8dbc6008030

29
src/btree.c
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@@ -4662,14 +4662,10 @@ int sqlite3BtreeMovetoUnpacked(
assert( pPage->intKey==(pIdxKey==0) );
lwr = 0;
upr = pPage->nCell-1;
if( biasRight ){
pCur->aiIdx[pCur->iPage] = (u16)(idx = upr);
}else{
pCur->aiIdx[pCur->iPage] = (u16)(idx = (upr+lwr)/2);
}
idx = biasRight ? upr : (upr+lwr)/2;
pCur->aiIdx[pCur->iPage] = (u16)idx;
pCur->info.nSize = 0;
if( pPage->intKey ){
assert( idx==pCur->aiIdx[pCur->iPage] );
for(;;){
i64 nCellKey;
pCell = findCell(pPage, idx) + pPage->childPtrSize;
@@ -4681,6 +4677,7 @@ int sqlite3BtreeMovetoUnpacked(
if( nCellKey==intKey ){
pCur->validNKey = 1;
pCur->info.nKey = nCellKey;
pCur->aiIdx[pCur->iPage] = (u16)idx;
if( !pPage->leaf ){
lwr = idx;
break;
@@ -4690,20 +4687,21 @@ int sqlite3BtreeMovetoUnpacked(
goto moveto_finish;
}
}else if( nCellKey<intKey ){
c = -1;
lwr = idx+1;
}else{
assert( nCellKey>intKey );
c = +1;
upr = idx-1;
}
if( lwr>upr ) break;
pCur->aiIdx[pCur->iPage] = (u16)(idx = (lwr+upr)/2);
if( lwr>upr ){
c = nCellKey<intKey ? -1 : +1;
pCur->aiIdx[pCur->iPage] = (u16)idx;
break;
}
idx = (lwr+upr)/2;
}
}else{
for(;;){
int nCell;
assert( idx==pCur->aiIdx[pCur->iPage] );
pCell = findCell(pPage, idx) + pPage->childPtrSize;
/* The maximum supported page-size is 65536 bytes. This means that
@@ -4745,6 +4743,7 @@ int sqlite3BtreeMovetoUnpacked(
rc = SQLITE_NOMEM;
goto moveto_finish;
}
pCur->aiIdx[pCur->iPage] = (u16)idx;
rc = accessPayload(pCur, 0, nCell, (unsigned char*)pCellKey, 0);
if( rc ){
sqlite3_free(pCellKey);
@@ -4756,6 +4755,7 @@ int sqlite3BtreeMovetoUnpacked(
if( c==0 ){
*pRes = 0;
rc = SQLITE_OK;
pCur->aiIdx[pCur->iPage] = (u16)idx;
goto moveto_finish;
}
if( c<0 ){
@@ -4763,8 +4763,11 @@ int sqlite3BtreeMovetoUnpacked(
}else{
upr = idx-1;
}
if( lwr>upr ) break;
pCur->aiIdx[pCur->iPage] = (u16)(idx = (lwr+upr)/2);
if( lwr>upr ){
pCur->aiIdx[pCur->iPage] = (u16)idx;
break;
}
idx = (lwr+upr)/2;
}
}
assert( lwr==upr+1 || (pPage->intKey && !pPage->leaf) );