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Slight performance improvement in the OP_Column opcode. 

FossilOrigin-Name: 5c157474391f90f24e8867c77fbc6564c7955ecc
This commit is contained in:
drh 2016-05-20 19:51:28 +00:00
parent d20b2a4109
commit a1851efc5d
3 changed files with 12 additions and 9 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Remove\sthe\ssqlite3PagerClearCache()\sroutine,\swhich\sdoes\snot\saccomplish\sanything\nuseful.
D 2016-05-20T18:09:01.269
C Slight\sperformance\simprovement\sin\sthe\sOP_Column\sopcode.
D 2016-05-20T19:51:28.931
F Makefile.in f59e0763ff448719fc1bd25513882b0567286317
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc 306d73e854b1a92ea06e5d1e637faa5c44de53c7
@ -444,7 +444,7 @@ F src/update.c 4f05ea8cddfa367d045e03589756c02199e8f9bd
F src/utf.c 699001c79f28e48e9bcdf8a463da029ea660540c
F src/util.c 810ec3f22e2d1b62e66c30fe3621ebdedd23584d
F src/vacuum.c feb1eabb20987983d9350cad98299b21fa811f52
F src/vdbe.c d71b935d2b21bef874680c34329adedc3b021101
F src/vdbe.c 9d0872c73555b335d7e658bb9b6fd69798ba551c
F src/vdbe.h 5591b5add447096e31288b5a0a78ec5d7b5c5170
F src/vdbeInt.h ddb157974436d87652de7dc641f7191496d9a8cd
F src/vdbeapi.c ba85b78fe08dc4a9ce747e62c89a2b4a4547e74c
@ -1490,7 +1490,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 4dc56e8684e0c74fb311c7f0ef1c367da8c7bf70
R f1ca77b965b4fac61acdc31594820a52
P f250166bb3c1b0c58e703b334825cf6210758fda
R 67f498d524675be2828322b33e8cc61d
U drh
Z c5c16d4ca102bc8075809f03a41e82f3
Z 6bf519f6e91709086e486df141738a73

2
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@ -1 +1 @@
f250166bb3c1b0c58e703b334825cf6210758fda
5c157474391f90f24e8867c77fbc6564c7955ecc

7
src/vdbe.c
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@ -2575,9 +2575,10 @@ case OP_Column: {
assert( p2<pC->nHdrParsed );
assert( rc==SQLITE_OK );
assert( sqlite3VdbeCheckMemInvariants(pDest) );
if( VdbeMemDynamic(pDest) ) sqlite3VdbeMemSetNull(pDest);
if( VdbeMemDynamic(pDest) ){
sqlite3VdbeMemSetNull(pDest);
}
assert( t==pC->aType[p2] );
pDest->enc = encoding;
if( pC->szRow>=aOffset[p2+1] ){
/* This is the common case where the desired content fits on the original
** page - where the content is not on an overflow page */
@ -2591,6 +2592,7 @@ case OP_Column: {
*/
static const u16 aFlag[] = { MEM_Blob, MEM_Str|MEM_Term };
pDest->n = len = (t-12)/2;
pDest->enc = encoding;
if( pDest->szMalloc < len+2 ){
pDest->flags = MEM_Null;
if( sqlite3VdbeMemGrow(pDest, len+2, 0) ) goto no_mem;
@ -2603,6 +2605,7 @@ case OP_Column: {
pDest->flags = aFlag[t&1];
}
}else{
pDest->enc = encoding;
/* This branch happens only when content is on overflow pages */
if( ((pOp->p5 & (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG))!=0
&& ((t>=12 && (t&1)==0) || (pOp->p5 & OPFLAG_TYPEOFARG)!=0))