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Three times faster sqlite3SrcListAppend() in the common case by avoiding the 

call to sqlite3SrcListEnlarge() for the first allocation.

FossilOrigin-Name: 0ea2762f1d8f6a93ae2ee3b7b835927a474c6f66
This commit is contained in:
drh 2016-12-14 11:14:13 +00:00
parent 8a123d60a8
commit ac178b3d7f
3 changed files with 12 additions and 9 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Fix\sthe\soptimization\sthat\sprevents\swriting\sfreelist\spages\sto\sthe\sjournal.
D 2016-12-14T10:30:12.405
C Three\stimes\sfaster\ssqlite3SrcListAppend()\sin\sthe\scommon\scase\sby\savoiding\sthe\ncall\sto\ssqlite3SrcListEnlarge()\sfor\sthe\sfirst\sallocation.
D 2016-12-14T11:14:13.907
F Makefile.in 7639c6a09da11a9c7c6f2630fc981ee588d1072d
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@ -334,7 +334,7 @@ F src/btmutex.c bc87dd3b062cc26edfe79918de2200ccb8d41e73
F src/btree.c b2055dff0b94e03eaad48a760984a2d8e39244e6
F src/btree.h 2349a588abcd7e0c04f984e15c5c777b61637583
F src/btreeInt.h 10c4b77c2fb399580babbcc7cf652ac10dba796e
F src/build.c 178f16698cbcb43402c343a9413fe22c99ffee21
F src/build.c 66bab5ee3998b1ebbea66ce0de60a82dcf497747
F src/callback.c 2e76147783386374bf01b227f752c81ec872d730
F src/complete.c a3634ab1e687055cd002e11b8f43eb75c17da23e
F src/ctime.c 9f2296a4e5d26ebf0e0d95a0af4628f1ea694e7a
@ -1536,7 +1536,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P c7021960f5c070fb5c9db9e41b4000d3dc065f42
R 29a5ab173feb9dcb847f7e97678fc3f9
P 6aa9b26544cbd0b41115c5f127dcf9a286d17e2b
R 5c6f1d55f58a01899a13212bdf50e07f
U drh
Z a1e79a7a1334afe1605804fa02a1d4f0
Z b26cd3596202cf83d05f18857a98dc5b

2
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@ -1 +1 @@
6aa9b26544cbd0b41115c5f127dcf9a286d17e2b
0ea2762f1d8f6a93ae2ee3b7b835927a474c6f66

7
src/build.c
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@ -3736,9 +3736,12 @@ SrcList *sqlite3SrcListAppend(
pList = sqlite3DbMallocRawNN(db, sizeof(SrcList) );
if( pList==0 ) return 0;
pList->nAlloc = 1;
pList->nSrc = 0;
pList->nSrc = 1;
memset(&pList->a[0], 0, sizeof(pList->a[0]));
pList->a[0].iCursor = -1;
}else{
pList = sqlite3SrcListEnlarge(db, pList, 1, pList->nSrc);
}
pList = sqlite3SrcListEnlarge(db, pList, 1, pList->nSrc);
if( db->mallocFailed ){
sqlite3SrcListDelete(db, pList);
return 0;