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Performance optimization to the moveToRoot() subroutine in btree.c.

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FossilOrigin-Name: b5842a70f8e26456a8f0d39539bc266f097480a4
This commit is contained in:
drh 2013-12-06 23:25:27 +00:00
parent b8a9bb4fb9
commit 4e8fe3ff91
3 changed files with 13 additions and 17 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Use\smemcmp()\sinstead\sof\sthe\sBINARY\scollating\sfunction\swhere\spossible,\sfor\na\sperformance\sboost.
D 2013-12-06T22:45:31.452
C Performance\soptimization\sto\sthe\smoveToRoot()\ssubroutine\sin\sbtree.c.
D 2013-12-06T23:25:27.601
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 1c1228bfeff3142c3d30f37f41c62e1e1456a04b
F src/btree.c 4037f58ef3f4459d0b9bb1fc1aee1136277d9ba6
F src/btree.h a61ddebc78c66795a2b93181321a116746302cc9
F src/btreeInt.h f038e818bfadf75afbd09819ed93c26a333d39e0
F src/build.c 9b40580b62916612678bdb69ce0286e39c29a862
@ -1145,7 +1145,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh d1a6de74685f360ab718efda6265994b99bbea01
F tool/win/sqlite.vsix 030f3eeaf2cb811a3692ab9c14d021a75ce41fff
P 2d62d1131f8bbc4e1f8f7aeaf0d91e3237fe3b7c
R 64ecaeb699cffb8c7d50ef92ad2b85dd
P c5a3a1af3c7bd34886e944a1fef2f6340ded24a0
R 12065e363c2320b45db52efcb2788f0d
U drh
Z 924fa8368d7b3d9057325dee3400f3cb
Z 6564d15f297e6c8ddf25ac421a3f69fc

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@ -1 +1 @@
c5a3a1af3c7bd34886e944a1fef2f6340ded24a0
b5842a70f8e26456a8f0d39539bc266f097480a4

16
src/btree.c
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@ -4395,8 +4395,6 @@ static void moveToParent(BtCursor *pCur){
static int moveToRoot(BtCursor *pCur){
MemPage *pRoot;
int rc = SQLITE_OK;
Btree *p = pCur->pBtree;
BtShared *pBt = p->pBt;
assert( cursorHoldsMutex(pCur) );
assert( CURSOR_INVALID < CURSOR_REQUIRESEEK );
@ -4411,16 +4409,12 @@ static int moveToRoot(BtCursor *pCur){
}
if( pCur->iPage>=0 ){
int i;
for(i=1; i<=pCur->iPage; i++){
releasePage(pCur->apPage[i]);
}
pCur->iPage = 0;
while( pCur->iPage ) releasePage(pCur->apPage[pCur->iPage--]);
}else if( pCur->pgnoRoot==0 ){
pCur->eState = CURSOR_INVALID;
return SQLITE_OK;
}else{
rc = getAndInitPage(pBt, pCur->pgnoRoot, &pCur->apPage[0],
rc = getAndInitPage(pCur->pBtree->pBt, pCur->pgnoRoot, &pCur->apPage[0],
pCur->wrFlag==0 ? PAGER_GET_READONLY : 0);
if( rc!=SQLITE_OK ){
pCur->eState = CURSOR_INVALID;
@ -4453,14 +4447,16 @@ static int moveToRoot(BtCursor *pCur){
pCur->atLast = 0;
pCur->validNKey = 0;
if( pRoot->nCell==0 && !pRoot->leaf ){
if( pRoot->nCell>0 ){
pCur->eState = CURSOR_VALID;
}else if( !pRoot->leaf ){
Pgno subpage;
if( pRoot->pgno!=1 ) return SQLITE_CORRUPT_BKPT;
subpage = get4byte(&pRoot->aData[pRoot->hdrOffset+8]);
pCur->eState = CURSOR_VALID;
rc = moveToChild(pCur, subpage);
}else{
pCur->eState = ((pRoot->nCell>0)?CURSOR_VALID:CURSOR_INVALID);
pCur->eState = CURSOR_INVALID;
}
return rc;
}