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Overview
| Comment: | Faster version of sqlite3VdbeSerialGet. (CVS 1495) |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
80985505fe8ba8e505842dae95d37bf4 |
| User & Date: | drh 2004-05-30 01:51:52 |
Context
|
2004-05-30
| ||
| 02:14 | Additional minor speed improvements. (CVS 1496) check-in: a90264c0 user: drh tags: trunk | |
| 01:51 | Faster version of sqlite3VdbeSerialGet. (CVS 1495) check-in: 80985505 user: drh tags: trunk | |
| 01:38 | Do not include the P3 parameter on OP_Integer opcodes if the integer will fit in 32 bits. The P3 conversion is slow. (CVS 1494) check-in: fcd84eba user: drh tags: trunk | |
Changes
Changes to src/vdbeaux.c.
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assert( serial_type!=0 );
if( serial_type>6 ){
return (serial_type-12)/2;
}else{
static u8 aSize[] = { 0, 1, 2, 4, 8, 8, 0, };
return aSize[serial_type];
}
#if 0
switch(serial_type){
case 6: return 0; /* NULL */
case 1: return 1; /* 1 byte integer */
case 2: return 2; /* 2 byte integer */
case 3: return 4; /* 4 byte integer */
case 4: return 8; /* 8 byte integer */
case 5: return 8; /* 8 byte float */
}
assert( serial_type>=12 );
return ((serial_type-12)>>1); /* text or blob */
#endif
}
/*
** Write the serialized data blob for the value stored in pMem into
** buf. It is assumed that the caller has allocated sufficient space.
** Return the number of bytes written.
*/
................................................................................
int sqlite3VdbeSerialGet(
const unsigned char *buf, /* Buffer to deserialize from */
u32 serial_type, /* Serial type to deserialize */
Mem *pMem /* Memory cell to write value into */
){
int len;
assert( serial_type!=0 );
/* memset(pMem, 0, sizeof(pMem)); */
pMem->flags = 0;
pMem->z = 0;
/* NULL */
if( serial_type==6 ){
pMem->flags = MEM_Null;
pMem->type = SQLITE3_NULL;
return 0;
}
/* Integer and Real */
if( serial_type<=5 ){
u64 v = 0;
int n;
len = sqlite3VdbeSerialTypeLen(serial_type);
if( buf[0]&0x80 ){
v = -1;
}
for(n=0; n<len; n++){
v = (v<<8) | buf[n];
}
................................................................................
pMem->r = *(double*)&v;
pMem->type = SQLITE3_FLOAT;
}else{
pMem->flags = MEM_Int;
pMem->i = *(i64*)&v;
pMem->type = SQLITE3_INTEGER;
}
return len;
}
/* String or blob */
assert( serial_type>=12 );
len = sqlite3VdbeSerialTypeLen(serial_type);
pMem->z = (char *)buf;
pMem->n = len;
if( serial_type&0x01 ){
pMem->flags = MEM_Str | MEM_Ephem;
}else{
pMem->flags = MEM_Blob | MEM_Ephem;
}
return len;
}
/*
** The following is the comparison function for (non-integer)
** keys in the btrees. This function returns negative, zero, or
|
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assert( serial_type!=0 );
if( serial_type>6 ){
return (serial_type-12)/2;
}else{
static u8 aSize[] = { 0, 1, 2, 4, 8, 8, 0, };
return aSize[serial_type];
}
}
/*
** Write the serialized data blob for the value stored in pMem into
** buf. It is assumed that the caller has allocated sufficient space.
** Return the number of bytes written.
*/
................................................................................
int sqlite3VdbeSerialGet(
const unsigned char *buf, /* Buffer to deserialize from */
u32 serial_type, /* Serial type to deserialize */
Mem *pMem /* Memory cell to write value into */
){
int len;
len = sqlite3VdbeSerialTypeLen(serial_type);
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];
}
................................................................................
pMem->r = *(double*)&v;
pMem->type = SQLITE3_FLOAT;
}else{
pMem->flags = MEM_Int;
pMem->i = *(i64*)&v;
pMem->type = SQLITE3_INTEGER;
}
}else if( serial_type>=12 ){
/* String or blob */
pMem->z = (char *)buf;
pMem->n = len;
if( serial_type&0x01 ){
pMem->flags = MEM_Str | MEM_Ephem;
}else{
pMem->flags = MEM_Blob | MEM_Ephem;
}
}else{
/* NULL */
assert( serial_type==6 );
assert( len==0 );
pMem->flags = MEM_Null;
pMem->type = SQLITE3_NULL;
}
return len;
}
/*
** The following is the comparison function for (non-integer)
** keys in the btrees. This function returns negative, zero, or
|