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Small performance optimization in the freeSpace() routine of btree.c.

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FossilOrigin-Name: 63962e2a927963575be74c3ce11f39f722c07c72
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drh
2016-09-17 19:34:32 +00:00
parent fd7459e0aa
commit 85f071b850
3 changed files with 12 additions and 9 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C Improved\sdescription\sof\sthe\sElseNotEq\sopcode\sin\scomments.\s\sNo\schanges\sto\scode. C Small\sperformance\soptimization\sin\sthe\sfreeSpace()\sroutine\sof\sbtree.c.
D 2016-09-17T17:39:01.590 D 2016-09-17T19:34:32.434
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F Makefile.msc e1aa788e84f926e42239ee167c53f785bedacacd F Makefile.msc e1aa788e84f926e42239ee167c53f785bedacacd
@@ -329,7 +329,7 @@ F src/auth.c 930b376a9c56998557367e6f7f8aaeac82a2a792
F src/backup.c 92c2e3b5fcb47626413717138617f4d32f08aea4 F src/backup.c 92c2e3b5fcb47626413717138617f4d32f08aea4
F src/bitvec.c 3ee4c8b2c94ed3a7377256e18199e6ff5cf33f63 F src/bitvec.c 3ee4c8b2c94ed3a7377256e18199e6ff5cf33f63
F src/btmutex.c bc87dd3b062cc26edfe79918de2200ccb8d41e73 F src/btmutex.c bc87dd3b062cc26edfe79918de2200ccb8d41e73
F src/btree.c 2551bd3ecb8b8988fb8b23aabadfb214dbc38e46 F src/btree.c 56e1732ecfb3731efcb216266ec26b1b96e5e8c9
F src/btree.h d05b2fcc290991a8a3d9ea1816ddd55a4359dcde F src/btree.h d05b2fcc290991a8a3d9ea1816ddd55a4359dcde
F src/btreeInt.h c18b7d2a3494695133e4e60ee36061d37f45d9a5 F src/btreeInt.h c18b7d2a3494695133e4e60ee36061d37f45d9a5
F src/build.c 7438b6dae3022818100a79ebbad707b5c65f9344 F src/build.c 7438b6dae3022818100a79ebbad707b5c65f9344
@@ -1525,7 +1525,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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2
manifest.uuid
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@@ -1 +1 @@
e011435e2f57ddfe315d5da48e93185d6789fc80 63962e2a927963575be74c3ce11f39f722c07c72

7
src/btree.c
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@@ -1605,8 +1605,11 @@ static int freeSpace(MemPage *pPage, u16 iStart, u16 iSize){
if( data[iPtr+1]==0 && data[iPtr]==0 ){ if( data[iPtr+1]==0 && data[iPtr]==0 ){
iFreeBlk = 0; /* Shortcut for the case when the freelist is empty */ iFreeBlk = 0; /* Shortcut for the case when the freelist is empty */
}else{ }else{
while( (iFreeBlk = get2byte(&data[iPtr]))>0 && iFreeBlk<iStart ){ while( (iFreeBlk = get2byte(&data[iPtr]))<iStart ){
if( iFreeBlk<iPtr+4 ) return SQLITE_CORRUPT_BKPT; if( iFreeBlk<iPtr+4 ){
if( iFreeBlk==0 ) break;
return SQLITE_CORRUPT_BKPT;
}
iPtr = iFreeBlk; iPtr = iFreeBlk;
} }
if( iFreeBlk>iLast ) return SQLITE_CORRUPT_BKPT; if( iFreeBlk>iLast ) return SQLITE_CORRUPT_BKPT;