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Avoid unnecessary calls to sqlite3VarintLen() from the OP_MakeRecord opcode.

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FossilOrigin-Name: 7a234fc3c5e7970ffe0b8d6ac33c26acb64b5c4d
This commit is contained in:
drh 2013-12-08 22:59:29 +00:00
parent 1e98310a14
commit 2a24287639
3 changed files with 16 additions and 11 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Interchange\stwo\sconditions\sin\san\s"if"\sstatment\sin\ssqlite3PagerAcquire()\sfor\nvery\sslight\s(0.06%)\soverall\sperformance\sincrease.
D 2013-12-08T19:54:52.040
C Avoid\sunnecessary\scalls\sto\ssqlite3VarintLen()\sfrom\sthe\sOP_MakeRecord\sopcode.
D 2013-12-08T22:59:29.482
F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
F Makefile.in e1a9b4258bbde53f5636f4e238c65b7e11459e2b
F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@ -280,7 +280,7 @@ F src/update.c d1c2477dcf14d90999d1935af4efb4806553250b
F src/utf.c 6fc6c88d50448c469c5c196acf21617a24f90269
F src/util.c 76ed0519296e3f62e97e57dab1999e34184c8e49
F src/vacuum.c 3728d74919d4fb1356f9e9a13e27773db60b7179
F src/vdbe.c 54894fde8dc806d259e015ac7c9680145e725835
F src/vdbe.c 7f51e9d422aefe6bcbaf7bf680e0d4ca9f6288cb
F src/vdbe.h c06f0813f853566457ce9cfb1a4a4bc39a5da644
F src/vdbeInt.h 05fbda0e061dbc4aaa2709a8cccf3515c245b263
F src/vdbeapi.c 93a22a9ba2abe292d5c2cf304d7eb2e894dde0ed
@ -1146,7 +1146,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
F tool/warnings.sh d1a6de74685f360ab718efda6265994b99bbea01
F tool/win/sqlite.vsix 030f3eeaf2cb811a3692ab9c14d021a75ce41fff
P 23d00f22872a907a8ebf5b80689ff7aa66686a07
R 8a0ad68f8a597479c8d7ee9e24cd34ea
P fbcc1a3ebb016225c3580181c908a2904cc184a5
R 09b58c480760cc431d5e01573bf9e4b3
U drh
Z ef2f6bbda3376e1ee20657f75cafac8c
Z 1bf421a053293bdaa5254a0efb062c9a

2
manifest.uuid
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@ -1 +1 @@
fbcc1a3ebb016225c3580181c908a2904cc184a5
7a234fc3c5e7970ffe0b8d6ac33c26acb64b5c4d

13
src/vdbe.c
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@ -2608,7 +2608,7 @@ case OP_MakeRecord: {
serial_type = sqlite3VdbeSerialType(pRec, file_format);
len = sqlite3VdbeSerialTypeLen(serial_type);
nData += len;
nHdr += sqlite3VarintLen(serial_type);
nHdr += serial_type<=127 ? 1 : sqlite3VarintLen(serial_type);
if( pRec->flags & MEM_Zero ){
/* Only pure zero-filled BLOBs can be input to this Opcode.
** We do not allow blobs with a prefix and a zero-filled tail. */
@ -2619,9 +2619,14 @@ case OP_MakeRecord: {
}
/* Add the initial header varint and total the size */
nHdr += nVarint = sqlite3VarintLen(nHdr);
if( nVarint<sqlite3VarintLen(nHdr) ){
nHdr++;
if( nHdr<=126 ){
/* The common case */
nHdr += 1;
}else{
/* Rare case of a really large header */
nVarint = sqlite3VarintLen(nHdr);
nHdr += nVarint;
if( nVarint<sqlite3VarintLen(nHdr) ) nHdr++;
}
nByte = nHdr+nData-nZero;
if( nByte>db->aLimit[SQLITE_LIMIT_LENGTH] ){