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Overview
| Comment: | Update sqlite3MemCompare() to try common cases first, for a modest speed improvement. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
b25bac79191975149d88fe34618c7435 |
| User & Date: | drh 2013-08-21 19:13:53 |
Context
|
2013-08-21
| ||
| 19:59 | Fix typo in test. check-in: f9859fe9 user: mistachkin tags: trunk | |
| 19:13 | Update sqlite3MemCompare() to try common cases first, for a modest speed improvement. check-in: b25bac79 user: drh tags: trunk | |
| 17:35 | If a virtual table xSync() returns an error message, copy it into a buffer allocated by sqlite3DbMalloc() before transfering it to Vdbe.zErrMsg. check-in: 854ba304 user: dan tags: trunk | |
Changes
Changes to src/vdbemem.c.
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}
/* If one value is a number and the other is not, the number is less.
** If both are numbers, compare as reals if one is a real, or as integers
** if both values are integers.
*/
if( combined_flags&(MEM_Int|MEM_Real) ){
if( !(f1&(MEM_Int|MEM_Real)) ){
return 1;
}
if( !(f2&(MEM_Int|MEM_Real)) ){
return -1;
}
if( (f1 & f2 & MEM_Int)==0 ){
double r1, r2;
if( (f1&MEM_Real)==0 ){
r1 = (double)pMem1->u.i;
}else{
r1 = pMem1->r;
}
if( (f2&MEM_Real)==0 ){
r2 = (double)pMem2->u.i;
}else{
r2 = pMem2->r;
}
if( r1<r2 ) return -1;
if( r1>r2 ) return 1;
return 0;
}else{
assert( f1&MEM_Int );
assert( f2&MEM_Int );
if( pMem1->u.i < pMem2->u.i ) return -1;
if( pMem1->u.i > pMem2->u.i ) return 1;
return 0;
}
}
/* If one value is a string and the other is a blob, the string is less.
** If both are strings, compare using the collating functions.
*/
if( combined_flags&MEM_Str ){
if( (f1 & MEM_Str)==0 ){
|
| > > | < < | | | | | | | | | > > | | < > | | | | < < < < < < < |
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}
/* If one value is a number and the other is not, the number is less.
** If both are numbers, compare as reals if one is a real, or as integers
** if both values are integers.
*/
if( combined_flags&(MEM_Int|MEM_Real) ){
double r1, r2;
if( (f1 & f2 & MEM_Int)!=0 ){
if( pMem1->u.i < pMem2->u.i ) return -1;
if( pMem1->u.i > pMem2->u.i ) return 1;
return 0;
}
if( (f1&MEM_Real)!=0 ){
r1 = pMem1->r;
}else if( (f1&MEM_Int)!=0 ){
r1 = (double)pMem1->u.i;
}else{
return 1;
}
if( (f2&MEM_Real)!=0 ){
r2 = pMem2->r;
}else if( (f2&MEM_Int)!=0 ){
r2 = (double)pMem2->u.i;
}else{
return -1;
}
if( r1<r2 ) return -1;
if( r1>r2 ) return 1;
return 0;
}
/* If one value is a string and the other is a blob, the string is less.
** If both are strings, compare using the collating functions.
*/
if( combined_flags&MEM_Str ){
if( (f1 & MEM_Str)==0 ){
|