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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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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] ){