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Various speed enhancements. (CVS 1498)

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FossilOrigin-Name: a0db15bba64af0c529d5be366659bca1165ff21b
This commit is contained in:
drh
2004-05-30 20:46:09 +00:00
parent 271efa5a28
commit e51c44f481
9 changed files with 126 additions and 100 deletions
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44
src/vdbeaux.c
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@@ -1229,21 +1229,37 @@ int sqlite3VdbeSerialGet(
assert( serial_type!=0 );
if( serial_type<=5 ){
/* Integer and Real */
u64 v = 0;
int n;
if( buf[0]&0x80 ){
v = -1;
}
for(n=0; n<len; n++){
v = (v<<8) | buf[n];
}
if( serial_type==5 ){
pMem->flags = MEM_Real;
pMem->r = *(double*)&v;
}else{
if( serial_type<=3 ){
/* 32-bit integer type. This is handled by a special case for
** performance reasons. */
int v = buf[0];
int n;
if( v&0x80 ){
v |= -256;
}
for(n=1; n<len; n++){
v = (v<<8) | buf[n];
}
pMem->flags = MEM_Int;
pMem->i = *(i64*)&v;
pMem->i = v;
return n;
}else{
u64 v = 0;
int n;
if( buf[0]&0x80 ){
v = -1;
}
for(n=0; n<len; n++){
v = (v<<8) | buf[n];
}
if( serial_type==5 ){
pMem->flags = MEM_Real;
pMem->r = *(double*)&v;
}else{
pMem->flags = MEM_Int;
pMem->i = *(i64*)&v;
}
}
}else if( serial_type>=12 ){
/* String or blob */